Sounder SIPS S-NPP CHART and CLIMCAPS Level-2 Products User Guide
Goddard Earth Sciences Data and Information Services Center (GES DISC) http://disc.gsfc.nasa.gov NASA Goddard Space Flight Center Code 610.2 Greenbelt, MD 20771 USA © 2019. All rights reserved.
DataProductUserGuideforS-NPPSounderSIPSCHARTandCLIMCAPS
CrISandATMSLevel-2Products
September2019
ProductVersion1.0
NationalAeronauticsandSpaceAdministrationGoddardEarthScienceDataInformationandServicesCenter(GESDISC)
Sounder SIPS S-NPP CHART and CLIMCAPS Level-2 Products User Guide
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Preparedby:
_______________________________________
RuthMonarrez,ProjectElementManagerS-NPPSounderSIPSJetPropulsionLaboratoryCaliforniaInstituteofTechnologyPasadena,CA
Reviewedby:
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ThomasHearty,GESDISCScienceDataSupport GSFCCode610.2
Contributors:Level2ScienceTeamChrisBarnet-PI CLIMCAPS ScienceandTechnologyCorp.(STC)NadiaSmith ScienceandTechnologyCorp.(STC)JoelSusskind-PI CHART GoddardSpaceFlightCenter(GSFC)ATMSLevel2SoftwareTeamEvanManning JPLPaulSpringer JPLGESDISCScienceDataSupportLenaIredell GSFC
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RevisionHistory
RevisionDate Changes Author
2019-09-09 InitialRelease EvanManning
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TableofContents.........................................................................................................................................i
1.0Introduction................................................................................................................................11.1OverviewofSounderSIPS.................................................................................................................11.2MissionDescription............................................................................................................................11.3CrISInstrumentDescription............................................................................................................21.4ATMSInstrumentDescription.........................................................................................................31.5DataDisclaimer...................................................................................................................................31.6 Where to find the Product....................................................................................................................31.7ContactInformation...........................................................................................................................31.8References.............................................................................................................................................3
2.0Level-2ProductOverview.......................................................................................................52.1ProductGranulationandIdentification........................................................................................52.2AlgorithmBackground......................................................................................................................62.3DataOrganization...............................................................................................................................72.4FileFormatandStructure.................................................................................................................72.5Metadata................................................................................................................................................72.6FileNamingConvention....................................................................................................................72.7TimeRepresentation..........................................................................................................................92.8DataHoldings.....................................................................................................................................10
3.0DataContent.............................................................................................................................113.1Dimensions.........................................................................................................................................113.2GlobalAttributes(metadata).........................................................................................................113.3VariableAttributes...........................................................................................................................133.4GroupStructure.................................................................................................................................143.5Geolocation.........................................................................................................................................143.6ScienceDataVariables.....................................................................................................................173.7QualityInformation..........................................................................................................................193.8MissingData/FillValues................................................................................................................203.9Keysupportinginformationvariablesforprofiles..................................................................203.10Verticalprofilerepresentationofgases...................................................................................213.11Knownissues...................................................................................................................................23
4.0OptionsforReadingtheData..............................................................................................245.0DataServices............................................................................................................................25
AppendixA:DifferencesbetweenCLIMCAPSandCHARTalgorithms............................27
A.1Firstguess.................................................................................................................................27A.2Iteration....................................................................................................................................27
A.3Errorestimationapproach..................................................................................................27
A.4QualityControlapproach.....................................................................................................27A.5Retrievedquantities..............................................................................................................27
AppendixB:Sampleimages........................................................................................................28
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AppendixC:Detailedfileformats.............................................................................................31C.1CLIMCAPSRetrievalproduct...............................................................................................32
SNPPL2CLIMCAPSCRIMSSInterfaceSpecification.............................................................32GlobalGroups............................................................................................................................................32GlobalDimensions...................................................................................................................................32GlobalAttributes......................................................................................................................................33GlobalVariables.......................................................................................................................................40auxVariables.............................................................................................................................................46mol_layVariables.....................................................................................................................................48mwVariables.............................................................................................................................................49
C.2CHARTRetrievalproduct.....................................................................................................50SNPPL2CHARTCRIMSSInterfaceSpecification...................................................................50GlobalGroups............................................................................................................................................50GlobalDimensions...................................................................................................................................50GlobalAttributes......................................................................................................................................50GlobalVariables.......................................................................................................................................58auxVariables.............................................................................................................................................64mol_layVariables.....................................................................................................................................66mwVariables.............................................................................................................................................66
C.3CLIMCAPSCloud-ClearedRadianceproduct...................................................................68
SNPPL2CLIMCAPSCRIMSSCCNSRInterfaceSpecification...............................................68GlobalGroups............................................................................................................................................68GlobalDimensions...................................................................................................................................68GlobalAttributes......................................................................................................................................68GlobalVariables.......................................................................................................................................76aux_l2Variables........................................................................................................................................79
C.4CHARTCloud-ClearedRadianceproduct.........................................................................81SNPPL2CHARTCRIMSSCCNSRInterfaceSpecification.....................................................81GlobalGroups............................................................................................................................................81GlobalDimensions...................................................................................................................................81GlobalAttributes......................................................................................................................................81GlobalVariables.......................................................................................................................................88aux_l2Variables........................................................................................................................................92
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1.0IntroductionThisdocumentprovidesbasicinformationforusingVersion1Level-2productsfromtheCross-track Infrared and Microwave Sounding Suite(CrIMSS)instrumentsontheSuomi-NPPspacecraft.TheCrIMSSinstrumentsuiteconsistsoftheCross-trackInfraredSounder(CrIS)infraredsounderandtheAdvancedTechnologyMicrowaveSounder(ATMS)microwavesounder.Theproductstheresultfromtworetrievalalgorithms:ClimateHeritageAIRSRetrievalTechnique(CHART)andCommunityLong-termInfraredMicrowaveCoupledAtmosphericProductSystem(CLIMCAPS).ThedifferentapproachesofthesetwoalgorithmsarebrieflydescribedinSection2.2andAppendixA.ThemainLevel-2retrievalproductfromeachalgorithmcontainsavarietyofgeophysicalparametersderivedfromtheCrIMSSdata,includingtemperatureprofiles,watervapor,constituents,clouds,andsurfacepropertiesforsixminutesofobservations.Anadditionalcloud-clearedradianceproductcontainsestimatedradiancesthatwouldhavebeenobservedintheabsenceofclouds.Thesefilescanbevaluablebecausetheretrievalalgorithmsutilizecloudclearedradiances.Theseproductshavebeenannotatedwithbothfileandvariablelevelattributestofullydescribetheircontents.1.1 OverviewofSounderSIPSTheSuomi-NationalPolar-OrbitingPartnership(S-NPP)SounderSIPS,isoneofsixSIPSsformedbyNASAtoprovidetheprocessingoflevel0datathroughlevel1,level2andlevel3fromtheSuomiNPP(previouslyknownasNPP)satellite.TheSuomi-NPPsatelliteismanagedbytheNationalPolar-orbitingPartnership(NPP)whichincludeselementsfromNASA,NOAAandDoD.DetailsabouttheS-NPPMissioncanbefoundat:https://www.jpss.noaa.gov/.TheS-NPPSounderSIPSisateammadeupoftheJetPropulsionLaboratory(JPL)andtheGoddardEarthSciencesDataandInformationServicesCenter(GESDISC).JPLprovidestheoverallprojectmanagement,sciencealgorithmsoftwareintegration,testandvalidationsupport.TheGESDISCperformslevel0dataacquisitionandroutinedataprocessingoperations.TheGESDISC/DistributedActiveArchiveCenteranddistributionofthedataproductsandassociateddocumentation.1.2MissionDescriptionTheS-NPPsatellitewaslaunchedonOctober28,2011fromVandenburgAirForceBaseinCaliforniaintoanorbitwithanaltitudeof824kmabovetheEarthsurface,aninclinationangleof98.7deganda13:30localtimeascendingnode[Reference3].SNPPisthefirstinaseriesofnextgenerationU.S.weathersatellitesoftheJointPolarSatelliteSystem(JPSS).
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CrIMSS(CrISandATMS)aretwoofthefiveinstrumentsonboardtheS-NPPsatellite.Theotherinstrumentsare:CloudsandtheEarth'sRadiantEnergySystem(CERES),OzoneMappingandProfilerSuite(OMPS)andVisibleInfraredImagingRadiometerSuite(VIIRS).Table1.2.1containsasummaryofplatformparameters.
Table1.2.1ApproximateS-NPPorbitalparameters.
Platform Alt Orbit Incl. (°)
Equator X Time
Period Repeat Orbits
Repeat Days
Launch
S-NPP 824 98.7 13:30* 101 228 16 28 Oct 2011 CrIS and ATMS are designed to be used together as CrIMSS, the Cross-track Infrared and Microwave Sounding Suite. Both algorithms used here combine infrared (IR) data from CrIS with microwave (MW) data from ATMS in a single IR+MW retrieval. 1.3CrISInstrumentDescriptionThe Cross-track Infrared Sounder (CrIS) is a Fourier Transform Spectrometer (FTS) which measures interferograms in three Infrared (IR) bands simultaneously. The CrIS interferometer includes a beamsplitter, a stationary and moving mirror, and a laser sampling system. The scene radiance entering the interferometer is split by the beamsplitter into two beams along two separate paths. One beam travels towards the moving mirror; the other to a stationary mirror. The two beams are reflected from the corresponding mirrors and recombine before converging on the detector. The optical path difference (OPD) traveled by the two beams is twice the physical path difference between the two mirrors. As the moving mirror sweeps from one side of the zero path difference (ZPD) to the other, a time-varying interference pattern known as the interferogram is recorded. A convolution of the interferogram with a Finite Impulse Response (FIR) numerical filter is applied in real-time on the spacecraft to reduce the internal data rate to meet telemetry requirements. This results in a complex-valued interferogram of a fixed number of sample points which is included in the downlinked data packets. During a single scene scan mirror dwell period, one interferogram is recorded for each of 27 detectors simultaneously (3 focal planes (LW, MW, SW) each containing 9 bore-sighted detectors in a 3x3 pattern). The CrIS uses a 45-degree scene scan mirror to provide sequential views of an internal blackbody (ICT), a deep space view (DS), and 30 Earth views in the cross-track direction in a repeating pattern as the spacecraft moves along-track. The interferograms associated with the ICT and DS views and a measurement of ICT temperature are used in the ground processing software to calibrate the Earth views to produce radiance spectra. Prior to calibration, a correction is applied to account for measured signal nonlinearity of selected detectors. Corrections are also applied in the ground processing software to remove FTS self-apodization effects and to resample the spectra to a predefined user spectral grid. These products were produced using version 1 of the CrIS Level-1B product in Normal Spectral Resolution (NSR).
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1.4ATMSInstrumentDescriptionATMSisa22-channelcross-trackscanningmicrowavesounderprovidingbothtemperatureandhumiditysoundings.Table1.4.1containsasummaryoftheATMSinstrumentparameters.TheATMSinstrument’sScanDriveMechanismonS-NPPhasbeenexperiencingadditionalwearonthebearings.Toextendthelifeoftheinstrument,adecisionwasmadetoperformscanreversalsforthepurposeof‘re-wetting’thebearings.Thescanreversalsarenowoccurringtwiceperorbit,startingAug9,2016.Theendresultofthismaneuverisaslightlossofdata.ThislossofdataisrepresentedbytheuseofFillValues.
Table1.4.1ATMSinstrumentparameters.
Platform Instrument Instrument Type
Scan Rate (s)
Scan Range (°)
Scan Pattern
FOR Diameter
(km, nadir)
Spectral Channels
S-NPP ATMS Microwave (MW)
8/3 ±53 96 16-75 22
1.5DataDisclaimerVersion 1.0 CrIMSS Level-2 data are released to the public as is. Every effort has been made to properly represent the data which this document describes. 1.6 Where to find the Product The CrIMSS Level-2 products can be found at and downloaded from the Goddard Distributed Active Archive Center (GDAAC). There you will find additional information and documentation about this product and other products of interest. Search “Suomi-NPP CrIMSS” (with quotes) under Data Collections.
https://disc.gsfc.nasa.gov
1.7ContactInformationForinformation,questionsorconcernswiththisCrIMSSLevel-2dataset,pleasesendto:[email protected].
1.8ReferencesIflinksdonotresolve,copytheurltoabrowser.
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1.NASASNPPCrossTrackInfraredSounder(CrIS)Level1BProductUsers’Guide2.NASASNPPCrossTrackInfraredSounder(CrIS)Level1BQualityFlagsDescriptionDocument3.DataProductUserGuideforSuomi-NationalPolar-OrbitingPartnership(S-NPP)SounderScienceInvestigator-ledProcessingSystem(SIPS)AdvancedTechnologyMicrowaveSounder(ATMS)Level1BProducts4.CHARTLevel-2ATBDhttps://docserver.gesdisc.eosdis.nasa.gov/public/project/SNPP/SNPP_limited_edition/SNPP.CrIMSS.CHART_V1.ATBD.pdf5.CLIMCAPSLevel-2ATBDhttps://docserver.gesdisc.eosdis.nasa.gov/public/project/SNPP/SNPP_limited_edition/SNPP.CrIMSS.CLIMCAPS_V1.ATBD.pdf 6.NetCDFClimateandForecast(CF)MetadataConventions,Version1.7,http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html 7.MERRA-2https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/
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2.0Level-2ProductOverview Level-2productsarecreatedfromCrISandATMSLevel-1Bobservationsusingtwoalgorithms:CHARTandCLIMCAPS.Eachofthesealgorithmscreatesamainretrievalproductwithgeophysicalparametersandanadditionalcloud-clearedradianceproduct,sofourproductfiletypesaredescribedinthisdocument:1) Level-2CHARTRetrievalproduct(L2_CHART_RET)2) Level-2CLIMCAPSRetrievalproduct(L2_CLIMCAPS_RET)3) Level-2CHARTCloud-ClearedRadiances(L2_CHART_CCR)4) Level-2CLIMCAPSCloud-ClearedRadiances(L2_CLIMCAPS_CCR)
2.1ProductGranulationandIdentificationTheLevel-2productsaredividedintoaseriesof6-minutesegmentsorgranuleswitheachgranulemakinguponefileand240granulesperday.Eachfilecontainsallobservationsforagiventypemadeduringaperiodofexactly6minutes.Foreachday,each240filesareidentifiedbygranulenumberinthefilename.Forexample,g156forgranule156outof240.Thenominalstarttimeofgranule1isdefinedtobe00:00:00.BecausebothCrISandATMSinstrumentsaresyncedtoTAI93,thestarttimeofthefirst8-secondscansetofadaycanbeanywhereupto8secondslater.Itmoves1secondwitheachleapsecond.Ifthefirstscansetstarts8secondsafterthenominalstarttime,thenthedatacanextendupto8secondspastthenominalendtime.TheabilitytouniquelyidentifyagranuleisbuiltintotheLevel-1BandLevel-2products.Thisisextremelyusefulwhenpublishinganalysisresults.Thenominaltimecoverage,representedasastring:yyyymmddThhmm,isusedtoconstructauniquegranuleidentifiercalled“gran_id”.gran_idisstoredasaglobalattributethatisalsousedinthefilename,seesection2.6FileNamingConvention.Inaddition,thereisanobservationidentifiervariablecalled“obs_id”thatcanfurtheruniquelyidentifyanobservationwithinthegranule.Theobs_idisformattedasthegran_idwithobservationinformationappendedtoit.Becauseofthedifferentviewinggeometry,ATMSandCrISobs_idsdiffer.Level-2CHARTandCLIMCAPSobs_idsfollowtheCrISpatternbecausetheirretrievedinformationcorrespondstoCrISgeometry.TheformatofATMSobs_idis:yyyymmddThhmm.aaaExxwhere‘aaa’isthe3-digitalong-trackindex(001–135)andxxisthecross-trackindex(01–96).The“E”indicatesearthview.Forexample:
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20160125T1300.001E18CrIS/Level-2obs_id:Eachfieldofregard(FOR),definedasasetof9simultaneouslyobservedfieldsofview,hasagloballyuniqueIDstoredinthevariable“obs_id”.TheobservationIDiscreatedfromthegranuleID,withinformationappendedtoidentifytheFORobservationwithinthegranule.Thedimensionsofthisvariable(atrack=45,xtrack=30)correspondtothefirsttwodimensionsofthesciencedatavariables,suchasradiances.AnobservationIDcanbeassociatedwithdatabyapplyingthesameindicesintothesecommondimensions.TheformatoftheCrIS/Level-2observationIDstringis“yyyymmddThhmm.aaExx”,where“aa”isthe2-digitalong-trackindex(01-45),and“xx”isthe2-digitcross-trackindex(01-30).The“E”indicatesthatitisanearthview.Forexample:
20160125T1300.01E18FOVObservationID:Atthefinestlevelofgranularity,eachfieldofview(FOV)withinaFORobservationhasagloballyuniqueIDthatisstoredinavariablecalled“fov_obs_id”.TheFOVobservationIDiscreatedfromtheobservationID,withextrainformationappendedtoidentifytheFOVwithintheFORobservation.Thedimensionsofthisvariable(atrack=45,xtrack=30,fov=9)correspondtothefirstthreedimensionsofthesciencedatavariables,suchasradiances.AFOVobservationIDcanbeassociatedwithdatabyapplyingthesameindicesintothesecommondimensions.TheformatoftheFOVobservationIDstringis“yyyymmddThhmm.aaExx.f”where“f”isthe1-digitFOVnumber(1-9).Forexample:
20160125T1300.01E18.6
2.2AlgorithmBackgroundTheSounderSIPSLevel-2dataproductsareaproductofprocessingNASALevel0datathroughLevel1A,Level1B,andLevel-2.ForadefinitionoftheNASADataProcessingLevelsgoto:https://earthdata.nasa.gov/earth-science-data-systems-program/policies/data-information-policy/data-levelsBothCHARTandCLIMCAPSarebasedontheAIRSLevel-2teamalgorithm[https://disc.gsfc.nasa.gov/information/documents?title=AIRS%20Documentation].CHARTv6.46remainsveryclosetotheAIRSv6algorithm,withchangesconsistentwithchangestowardstheAIRSv7algorithm[
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https://airs.jpl.nasa.gov/system/presentations/files/321_Susskind_AIRS_CrIS_Retrieval.pdf].CLIMCAPSv1.01isbasedonanearlierAIRSteamalgorithm.ItreplacestheSCCNNneuralnetfirstguesswithMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess),streamlinesthealgorithmflowtouseasinglepass,andusesoptimalestimationintheindividualspeciesretrievalsteps[https://airs.jpl.nasa.gov/system/presentations/files/381_StatusBarnet.pdf]. TechnicaldetailsoftheLevel-2processingstepsandcalibrationscanbefoundintheAlgorithmTheoreticalBasisDocuments(ATBDs).Seereferences.
2.3DataOrganizationTheLevel-2productsaredividedintoaseriesof6-minutesegmentswithonesegmentperfile.Eachfilecontainsallobservationsofagiventypemadeduringaperiodofexactly6minutes.Foreachdaythereare240files(alsoknownasgranules),identifiedbygranulenumberinthefilename.Forgranulestarttimedetails,refertosection2.1.2.4FileFormatandStructureThefilesareinNetworkCommonDataForm,version4(netCDF4/HDF5)format.TheproductformattakesadvantageofthenetCDF4datamodelandmakesuseofgroups,dimensions,variablesandattributestofullydescribethesciencedata. 2.5MetadataEveryefforthasbeenmadetoensurethatmetadataconformstotheClimateandForecasting(CF),Version1.6,andAttributeConventionsforDataDiscovery(ACDD),Version1.3,guidelines.SeethefullproductspecificationsinAppendixC. FormoreinformationonCF,referto: http://cfconventions.org/FormoreinformationonACDD,referto:
http://wiki.esipfed.org/index.php?title=Category:Attribute_Conventions_Dataset_Discovery2.6FileNamingConventionFilenamingforSounderSIPSproductswillbeuniqueandincludethefollowingtokensseparatedbythedelimiter‘.’Foreachtokenthatmakesupthefilename,therewillbeanattributeinthedataproductthatitmapsto(seeTable2.6.1Filenaming).
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<Sounder_SIPS_ID>.<platform>.<inst_ID>.<granuleID>.<product_granularity>.<granule_number>.<product_type>.<variant>.<version>.<production_location>.<prod_timestamp>.<extension>Where:
o Sounder_SIPS_IDasaprojectidentifier<product_name_project>=SNDRo platform<product_name_platform>=SNPPo inst_ID<product_name_instr>=CRIMSSo granuleID(yyyymmddThhmm)<gran_id>nominalstarttimewhere:
§ yyyy=year§ mm=monthofyear(01-12)§ dd=dayofmonth(01-31)§ hh=hour(00-24)§ mm=minute(00-59)
o product_granularity<product_name_duration>=m06(6minute)o granule_number<granule_number>=g###o product_typewithanoptionalidentifierfortesting<product_type_name_id>
§ L2_CHART_RET_NSRforCHARTgeophysicalretrievedproductsderivedfromCrISNSRspectralresolution.
§ L2_CLIMCAPS_RET_NSRforCLIMCAPSgeophysicalretrievedproductsderivedfromCrISNSRspectralresolution.
§ L2_CHART_CCR_NSRforCHARTcloud-clearedradiancesatNSRspectralresolution.
§ L2_CLIMCAPS_CCR_NSRforCLIMCAPScloud-clearedradiancesatNSRspectralresolution.
o variant<product_name_variant>=stdo versionvmm_mm<product_name_version>-eg.v01_25
§ VersioningwillbesynchronizedacrossSounderSIPSproducts§ Version1Level-2productsarederivedfromversion1Level-1B
productso production_location<product_name_producer>-J=SIPSatJPL,
G=Operations,T=Test,W=CrISTeamatUnivofWisco prod_timestampsoeachproducthasauniquename(yymmddhhmmss)
<product_name_timestamp>-150407123456o Extension(.nc)
Table2.6.1ProductFilenamingFilenametoken AttributenameinCDF
(mapping)Format Value(s) Notes
Sounder_SIPS_ID product_name_project SNDR
platform product_name_platform SNPP
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inst_ID product_name_instr CRIMSS CRIMSS=CrIS+ATMS
granuleID gran_id yyyymmddThhmm Nominalstarttime
product_granularity product_name_duration m06 6minutes
granule_number granule_number g### g001–g240 Onlyfor6-minutegranuleLeve-1andLevel-2products
product_type product_name_type_id+optionalidentifierforuniqueness
L2_<alg>_<prod>_NSR L2_CHART_RET_NSR
L2_CHART_CCR_NSR
L2_CLIMCAPS_RET_NSR
L2_CLIMCAPS_CCR_NSR
<alg>isCHARTorCLIMCAPS
<prod>isRETorCCR
_NSRisalwayspresentinthev1releasebecausev1Level-1BCrISisonlyNSR
Version product_name_version v01_##;v01_##_## e.g.v01_05;(v01_05_00whenproducedatJPL)
variant product_name_variant Freeformtext.Nowhitespaceoranypunctuationexceptunderscore.
std Usedtoidentifyspecialruns.Thedefaultis:std=standard.
production_location product_name_producer J:JPLG:GSFCT:Test
prod_timestamp product_name_timestamp yymmddhhmmss
ExampleFilename:6-minuteCrIMSSLevel-2granule
SNDR.SNPP.CRIMSS.yyyymmddThhmm.m06.g101.L2_CLIMCAPS_RET_NSR.std.vmm_mm.G.yymmddhhmmss.nc
SNDR.SNPP.CRIMSS.20160114T1000.m06.g101.L2_CLIMCAPS_RET_NSR.std.v02_04.G.180110183539.nc2.7TimeRepresentation
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TimesintheLevel-2productsaregenerallyrepresentedasUTC.However,observationtimesareprovidedinbothUTCandTAI93representationsasaconveniencetousers.CoordinatedUniversalTime(UTC)istheinternationalstandardforrepresentationoftime.UTCtimesareexpressedinhuman-readableform,asasetofvaluesindicatingyear,month,day,hourandsoon.Inthedatastreamreceivedfromthesatellite,observationtimesarerepresentedasUTC.TimestampsinproductfilenamesandattributesarerepresentedasUTCandformattedaccordingtothe“ISO8601:2004”standard.Forexample,thetimeJanuary25,2016at13:00mayberepresentedaseitherofthefollowing:
2016-01-25T13:00Z20160125T1300
Thelongerformisusedinattributes,andthemorecompactformisusedinfilenames.Thecharacter“Z”indicates“Zulutime”,orUTC.InternationalAtomicTime(TAI)isexpressedasnumberofsecondselapsedonthesurfaceoftheEarthsincesomereferenceUTCtime.Theterm“TAI93”indicatesthatthereferencetimeisthebeginningoftheyear1993,or1993-01-01T00:00:00Z.Thisreferencetimewaschosentobeconsistentwithdataproductsfromotherinstruments,andtoallowforpreciserepresentationoftimesspanningtheexpectedmissionlength.
2.8DataHoldingsFortheinitialreleaseofv1CHART&CLIMCAPS,atestdatasetof8monthsofdataisprovided.Thisdatacoversthemonthsof{January,April,July,October}oftheyears2013&2015.ThissetisdesignedtoallowresearchandcomparisonsoverafullseasonalcycleandcomparisonsofdifferentphasesoftheENSOcycle.
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3.0DataContentTheLevel-2dataproductsarewritteninnetCDF4formatandthereforemakesuseofgroups,dimensions,variablesandattributes(global&variable).EverynetCDF4filecontains,ataminimum,onerootgroupwhichisunnamed.Attentionshouldbegiventoqualityflagsandcheckedforfillvaluesbeforebeingusedforanyanalysisorhigherprocessingoftheproduct.AfullprofileofthecontentsofthefilesisincludedinAppendixC.
Selectedfieldsarehighlightedinthissection.
3.1Dimensions KeydimensionsforCHARTandCLIMCAPSLevel-2RETandCCRproducts.
Table3.1KeyRETDimensions
Name Size Description atrack 45 along-track spatial dimension xtrack 30 cross-track spatial dimension fov 9 Field-of-view dimension air_pres 100 Fine atmospheric pressure levels for temperature and most gases air_pres_h2o 66 Fine atmospheric pressure levels for water-vapor variables
Table3.2KeyCCRDimensions
Name Size Description atrack 45 along-track spatial dimension xtrack 30 cross-track spatial dimension wnum_lw 717 longwave IR channel number wnum_mw 437 midwave IR channel number wnum_sw 163 shortwave IR channel number
3.2GlobalAttributes(metadata)Therearetwotypesofattributes:global&variable.Inthissectionwewilltalkaboutglobalattributes.Globalattributes,sometimesreferredtoas‘file-levelattributes’,provideinformationabouttheentirefileor6-minutegranule.Thisincludesobservationtimes,publisherandcreatorinformation,dataprovenance,andlocationinformation.ManyattributesarerequiredtoconformtotheCF&ACDDstandardswhileotherattributesarewrittenforconsistencywithlegacyproducts.
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AfulldefinitionoftheglobalattributescanbefoundinAppendixC.
Table3.2.2KeyGlobalAttributes
Name Description date_created The date on which this version of the data was created geospatial_lat_min The southernmost latitude covered by the dataset geospatial_lat_max The northernmost latitude covered by the dataset geospatial_lon_min The westernmost longitude covered by the dataset. See also
geospatial_lon_max. geospatial_lon_max The easternmost longitude covered by the dataset. Cases where
geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity at the antimeridian, to geospatial_lon_min; for example, geospatial_lon_min=170 and geospatial_lon_max=-175 incorporates 15 degrees of longitude (ranges 170 to 180 and -180 to -175).
geospatial_lat_mid granule center latitude geospatial_lon_mid granule center longitude geospatial_bounds Describes the data's 2D or 3D geospatial extent in OGC's Well-Known
Text (WKT) Geometry format. Longitude values are limited to the (-180, 180) range. Example: 'POLYGON ((40.26 -111.29, 41.26 -111.29, 41.26 -110.29, 40.26 -110.29, 40.26 -111.29))'.
product_name_granule_number zero-padded string for granule number of day (g001-g240) gran_id Unique granule identifier yyyymmddThhmm of granule start, including
year, month, day, hour, and minute of granule start time identifier_product_doi digital signature (DOI) AutomaticQualityFlag "Passed": the granule contains a non-degraded retrieved value for at least
one value in a geolocated FOV; "Suspect": the granule does not qualify as "Passed" but contains a (possibly degraded) retrieved value (possibly without associated geolocation); "Failed": the granule contains no retrieved values.
qa_no_data A simple indicator of whether this is an "empty" granule with no data from the instrument. "TRUE" or "FALSE".
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3.3VariableAttributesEachvariablehasitsownassociatedattributes.VariableattributesareaCFstandardandareusedtodescribethevariableinmoredetailtoproperlyinterpretitsvalue.
Table3.3:VariableAttributesAttribute Description
units units, for variables that represent physical quantities _FillValue a single sentinel value indicating the data point contains fill instead of
valid data standard_name standard name from the CF standard name table, if one exists for the
quantity being represented long_name a longer name describing the quantity being represented, suitable for a plot
title description a longer description of the quantity being represented valid_range a pair of values indicating the minimum and maximum values to be
considered valid coordinates a space-separated list of the names of other variables that are coordinates
for this variable coverage_content_type ACDD/ISO field categorizing types of data:
• image • thematicClassification • physicalMeasurement • auxillaryInformation • coordinate • modelResult • qualityInformation • referenceInformation
https://geo-ide.noaa.gov/wiki/index.php?title=ISO_19115_and_19115-2_CodeList_Dictionaries#MD_CoverageContentTypeCode
ancillary_variables a space-separated list of the names of other variables that contain information about this variable
bounds defines the extent, for cell variables cell_methods describes statistical methods used to derive data, for cell variables flag_values These attributes collectively tell how to interpret flag variables. See the
CF standard for details. In these Level-2 products, these attributes are mostly used in association with the *_qc QC ancillary variables.
flag_meanings flag_masks
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3.4GroupStructure
OnefeaturewhichwasaddedtonetCDF4istheabilitytostructurefileswith“groups”,whicharesimilartoadirectoryhierarchy.SounderCDFfilesaredesignedsothatallofthemostcommonlyneededinformationiscontainedin“/”,therootgroup.Subgroupscontainmorespecializedinformation.Thesearethegroupsforretrievalfiles:Group Purpose/(root) Maingroup,withtemperatureandwatervaporprofiles,alongwith
supportinglocationandqualityinformation/mw ResultsfromtheMicrowave-Onlyretrievalstep/mol_lay Retrievedvaluesofwatervaporandothergasesinunitsofmoleculesper
squaremeterperlayer--theSIequivalentofthe“columndensity”usedintheSARTAforwardmodel
/aux Supportinginformationprimarilyforthealgorithmdevelopers/ave_kern Averagingkernels(notincludedinthev1release)
Thesearethegroupsforcloud-clearedradiancefiles:Group Purpose/(root) Maingroup,withcloud-clearedspectra,alongwithsupportinglocation
andqualityinformation/aux_l2 SupportinginformationabouttheLevel-2retrievalprimarilyforthe
algorithmdevelopers/aux_l1b_cris Supportinginstrumentcharacterizationinformationpropagatedfrom
Level-1(notincludedinthev1release)3.5GeolocationGeolocationparametersareusedfordetermininglocationofeachobservationonEarthandassociatedinformationaboutthatlocation.Geolocationvariablesarelocatedinthefileattherootlevel.Theseincludelatitudesandlongitudesassociatedwitheachobservation,aswellassatelliteandsolargeometryinformation,spacecraftpositionandorbitalcharacteristics,surfaceinformationandrelatedmetadata.Theseproductscomefromretrievalalgorithmsthatdoacloud-clearingonaField-of-Regard(FOR)madeupof9Fields-of-View(FOVs).InthisretrievalitisassumedthatmostgeophysicalparametersareconstantovertheareaofaFOR,andtheseareprovidedatFORspatialresolution(45x30).Forsomevariables,includingsomecloudquantities,informationisavailableatFOVspatialresolution(45x30x9).Theproductcontainstwo
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setsoflocationinformation:{lat,lon,land_frac,...}provideinformationaboutthelargerFORwhile{fov_lat,fov_lon,fov_land_frac,…}provideinformationaboutthesmallerFOV.The“coordinates”variableattributeattachedtoeachgeophysicalfieldspecifieswhichsetoflatitudeandlongitudeisappropriate.
Table3.5.1GeolocationDimensions
Dimensionname Size Meaning
atrack 45 Along-trackFORhorizontaldimension
xtrack 30 Cross-trackFORhorizontaldimension
fov 9 CrISFOVdimensionwithinFOR
fov_poly 8 latitude/longitude points defining the polygon bounding an fov (anticlockwise as viewed from above)
Figure1.geolocationhorizontaldimensions
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Thekeygeolocationvariablesare:
Table3.5.2KeyFORGeolocationVariablesGeolocationVariable
Dimensions Meaning
lat atrack,xtrack latitudeofFORcenter
lon atrack,xtrack longitudeofFORcenter
lat_bnds atrack,xtrack,fov_poly
latitudeofFORboundingpolygon
lon_bnds atrack,xtrack,fov_poly
longitudeofFORboundingpolygon
land_frac atrack,xtrack LandfractionovertheFOR
surf_alt atrack,xtrack meansurfacealtitudeWRTEarthmodeloverFOR
obs_time_tai93 atrack,xtrack earthviewobservationmidtimeforeachfovinunitsofsecondssince1993-01-01T00:00:00
obs_time_utc atrack,xtrack,utc_tuple
UTCearthviewobservationtimeasanarrayofintegers:year,month,day,hour,minute,second,millisecond,microsecond
Correspondingvariablesfov_lat,fov_lon,fov_lat_bnds,fov_lon_bnds,fov_land_frac,fov_surf_altprovideinformationattheFOVspatialresolution.
Fullgeolocationincludesinformationaboutsolargeometry(sol_zen,sol_azi,sun_glint_dist),viewinggeometry(sat_zen,sat_azi,view_ang,sat_range,subsat_lat,…)andorbitalparameters.SeeAppendixCforfullspecification.
Onekeyfeatureisboundaries.EachFORandFOVhasabounding8-pointpolygoninvariables{lat_bnds,lon_bnds}and{fov_lat_bnds,fov_lon_bnds}.Thismakesiteasytoplacevaluesinappropriateregionsonamap,includingthedistortedshapesofFOVsandFORsattheedgesoftheswath.
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Figure2.SampleplotofretrievedCrISNH3usingboundingpolygons.Credit:KarenCady-Pereira.
3.6ScienceDataVariablesTheseretrievalsprovideinformationonawidevarietyofgeophysicalparameters,includingtemperature,watervapor,constituents,clouds,andsurfaceparameters.Thisresultsinalargenumberofsciencedatavariables.
Manyvariableshaveassociatedqualitycontrolanderrorestimateinformation.Thesearecontainedinvariableswiththesamenamebutwith“_qc”and“_err”appended.Forexampletheairtemperatureprofileiscontainedinavariablenamed“air_temp”;itserrorestimateisin“air_temp_err”anditsqualitycontrolis“air_temp_qc”.The“ancillary_variables”variableattributeofair_templists“air_temp_qc,air_temp_err”.Inthetablesbelowtheancillaryvariablesarenotlistedexplicitly.Theyareindicatedinthe“ancillaryvariables”column.
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Keysciencedatafieldsaredefinedbelow.Seetheappendixesforafulllisting.
Table3.6.1KeyRETScienceDataVariablesName Dimensions Description Units Ancillary
Variables air_temp atrack, xtrack,
air_pres air temperature profile Kelvin err, qc
surf_air_temp atrack, xtrack near-surface air temperature (~2 meters above surface)
Kelvin err, qc
h2o_vap_tot atrack, xtrack total precipitable water vapor kg / m2 err, qc spec_hum atrack, xtrack,
air_pres_h2o mass fraction of water vapor in moist air
unitless err, qc
surf_spec_hum atrack, xtrack Near-surface mass fraction of water vapor in moist air
unitless err, qc
rel_hum atrack, xtrack, air_pres_h2o
relative humidity over equilibrium phase
unitless err, qc
surf_rel_hum atrack, xtrack relative humidity near the surface over equilibrium phase
unitless err, qc
gp_hgt atrack, xtrack, air_pres
Geopotential is the sum of the specific gravitational potential energy relative to the geoid and the specific centripetal potential energy. Geopotential height is the geopotential divided by the standard acceleration due to gravity.
m err, qc
surf_gp_hgt atrack, xtrack geopotential height at the surface
m err, qc
o3_tot atrack, xtrack Total column ozone. (Multiply by 4.670e5 to convert to Dobson Units from kg m^-2)
kg m-2 err, qc
o3_mmr atrack, xtrack, air_pres
ozone mass mixing ratio to moist air
unitless err, qc
co_mmr_midtrop atrack, xtrack Carbon monoxide mass mixing ratio to moist air at 50000 Pa, near the peak of sensitivity
unitless err, qc
ch4_mmr_midtrop atrack, xtrack Methane mass mixing ratio to moist air at 40000 Pa, near the peak of sensitivity
unitless err, qc
h2o_liq_tot atrack, xtrack total column cloud liquid water kg m-2 err, qc h2o_liq_mol_lay atrack, xtrack,
air_pres_lay cloud liquid water layer total unitless err, qc
cld_frac atrack, xtrack, fov, cld_lay
effective cloud fraction unitless err, qc
cld_top_pres atrack, xtrack, fov, cld_lay
cloud top pressure in order of increasing pressure
Pa err, qc
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cld_top_temp atrack, xtrack, fov, cld_lay
cloud top temperature Kelvin err, qc
num_cld atrack, xtrack, fov
Number of cloud layers with nonzero cloud fraction
unitless
tpause_gp_hgt atrack, xtrack tropopause geopotential height, where tropopause is determined according to the WMO definition
m qc
tpause_pres atrack, xtrack tropopause pressure, where tropopause is determined according to the WMO definition
Pa qc
tpause_temp atrack, xtrack tropopause temperature, where tropopause is determined according to the WMO definition
Kelvin qc
surf_freq_mw surf_freq_mw Microwave surface emissivity frequencies (hinge points)
Hz
Table3.6.2KeyCCRScienceDataVariablesName Dimensions Description Units Ancillary
Variables rad_lw atrack, xtrack,
wnum_lw longwave clear spectral radiance
mW/(m2 sr cm-1) err, qc
rad_mw atrack, xtrack, wnum_mw
midwave clear spectral radiance
mW/(m2 sr cm-1) err, qc
rad_sw atrack, xtrack, wnum_sw
shortwave clear spectral radiance
mW/(m2 sr cm-1) err, qc
nedn_lw fov, wnum_lw longwave noise equivalent differential radiance
mW/(m2 sr cm-1)
nedn_mw fov, wnum_mw midwave noise equivalent differential radiance
mW/(m2 sr cm-1)
nedn_sw fov, wnum_sw shortwave noise equivalent differential radiance
mW/(m2 sr cm-1)
3.7QualityInformationFor most retrieved geophysical variables, a numerical error estimate in the same physical units is provided in a corresponding ancillary_variable with a name ending in “_err”. There are also Quality Control (QC) scores of {0, 1, 2} in corresponding ancillary_variables with a name ending in “_qc”.
Table:3.7.1*_qcValues
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Value Meaning 0 Highest quality – use without reservation 1 Good quality – suitable for most purposes
2 Do not use. In some cases a physical value is present but is not considered reliable. In other cases only fill values are present.
WhiletheCHARTandCLIMCAPSproductsbothhavethisstructure,thephilosophyofsettingindividualvaluesisdifferent.CLIMCAPSdecidesanentireFORretrievalisgoodorbadandsetsalllevelsofallvariablescollectivelyto0or2.CHARTmakesdifferentjudgementsperphysicalquantityandperpressurelevel,andusesthe“1”intermediatequalitylevel.
Inadditiontothe_qcand_errvariables,thereareotherindicatorsofquality.*_dofaredegrees-of-freedomforretrievalsofindividualquantities(air_temp_dof,h2o_vap_dof,o3_dof,….).Inthe/auxsubgrouptherearemoredetailedinternalqualityindicatorsincludingcloud-clearingnoiseamplificationfactorsandChi-squared.
3.8MissingData/FillValuesFillvaluesareusedwherethereisnovaliddata,includingprofileslevelwithpressuresgreaterthanthesurfacepressure.Thefillvalueisindicatedbytheattribute‘_FillValue’.Itisadvisedtocheckthedataforfillvaluesbeforeitisused.Thefillvaluespervariabledatatypearelistedinthetablebelow.
Table:3.8.1FillValuesVariable Type Fill Value unsigned 8-bit integer 255UB unsigned 16-bit integer 65535US
unsigned 32-bit integer 4294967295U floating point 9.96921e+36
3.9KeysupportinginformationvariablesforprofilesThese variables provide supporting information to interpret the science variables.
Name Dimensions Description Units
air_pres air_pres pressure levels Pa air_pres_h2o air_pres_h2o H2O vapor pressure levels Pa air_pres_lay air_pres_lay pressure at the middle of each layer Pa
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air_pres_lay_bnds air_pres_lay, bnds_1d
Min and max pressure of each layer Pa
air_pres_nsurf atrack, xtrack Index in air_pres of the level at the surface. Values at levels beyond this are invalid, representing data below the Earth's surface.
unitless
air_pres_h2o_nsurf atrack, xtrack Index in air_pres_h2o of the level at the surface. Values at levels beyond this are invalid, representing data below the Earth's surface.
unitless
air_pres_lay_nsurf atrack, xtrack Index in air_pres_lay of the layer at the surface. Values for layers beyond this are invalid, representing data below the Earth's surface.
unitless
3.10VerticalprofilerepresentationofgasesBoth retrievals maintain internal vertical profiles of gases on 100 fixed-pressure layers. This information is preserved in the “mol_lay” subgroup. For the main public products in the root group, water vapor and ozone are reported on the 100 fixed-pressure levels which bound the layers. For water vapor, levels at pressures under 5153 Pa (51.53 hPa) are not reported. For gases CO and CH4, where there is less than a single degree of freedom, we report MMR only at a single pressure level near the peak of the retrieval sensitivity: 40000 Pa for CH4, and 50000 Pa for CO. Pressure levels below the surface are always filled with fill values. Level concentrations of gases are estimated from the layer gas amounts using different approaches, based on different philosophies. For CHART, we use a smoothing spline fit to represent the limits of the vertical information that is present in the input CrIMSS data by removing sharper features which may be artifacts from SCCNN. For CLIMCAPS, a more direct interpolation preserves information from MERRA2 (seeSection3.11,GFSwasaccidentallyusedasthefirstguess) along with the information from the retrieval.
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Figure3.WatervaporlevelconcentrationforCLIMCAPSandCHART.
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For CLIMCAPS, level concentrations of gases are estimated from layer-amounts using the mean-value theorem and assuming that layers with boundaries at
𝑃bnd = 𝑃' −𝑃')*
ln𝑃' − ln𝑃')*, have mean values which estimate the profile at the levels Pi. Layer-mean mixing ratios are uniquely specified by the layer amounts, the temperature profile and pressure differences through the hydrostatic and hypsometric equations [Wallace and Hobbs, 1977, pgs. 53-54]. Figure 3a illustrates the procedure. A true radiosonde profile of water vapor mixing ratio is converted to layer amounts as would be produced by the CLIMCAPS algorithm. These are shown in the figure as mean mass mixing ratio, which is obtained by dividing the layer water vapor amount by the layer dry air amount. The amounts in each layer are summed from top to bottom to produce a piecewise linear profile of top-to-level integrated amount. The integrated amount is then interpolated to a new set of levels, Pbnd, and differenced to produce a new set of layer amount. Similarly, the dry-air top-to-level integrated amounts are interpolated to the new levels, and mean mixing ratios (ratio of gas amount to dry-air amount) are assumed to be the mixing ratio at the levels Pi. Values at the end points are linearly extrapolated from the profile at interior points. The reported profiles have errors from the interpolations and use of the mean value theorem1. The algorithm uses linear interpolation in log pressure and top-to-level amount which introduces larger errors when top-to-level amount second derivative is large; these errors are not included in mixing ratio error estimates. Error estimates for the level mixing ratios are interpolated from the fractional layer-amount errors. Fractional error is assumed to be fully correlated and linearly interpolated in log pressure from the arithmetic mean pressures of each level (uncorrelated error involves linearly interpolating variance). CHART level concentrations are estimated from the layer amounts by least squares fitting a profile to the CHART output layer amounts. The mixing ratio profile is represented as a sum of 4th-order bsplines:
𝑋(𝑃) = ∑ 𝐴'𝑏'(𝑃)' , the fitting solves for the coefficients Ai, subject to the layer column amounts, a climatological smoothness a priori, and constrained to match the column total. Figure 3b shows the same profile as in the previous figure, and shows the bspline functions, the fitted profile, and the error profile error estimates. This algorithm adds some smoothness to the output profile and performs comparably to the mean-value-theorem method, when the fitting functions are representative of the structure contained in the input layer quantities.
3.11Knownissuesa) The MERRA-2 first guess profile was accidentally overwritten by the GFS forecast file,
so that in this 8-month sample run the apriori and all the "fg" variables are actually the
1Themeanvaluetheoremsaysthatsomepointintheintervalhasthemeanvalue,butnotwherethepointislocated.
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GFS forecast interpolated to the time and location of the observation. For the purpose of evaluation of the behavior of CLIMCAPS versus CHART the use of GFS forecasts should not be significantly different than MERRA-2.
b) CLIMCAPS surf_emis_mw is wrong. c) Reported error estimates are all fill values for
i. [surf_]spec_hum_sat_[ice|liq]_err ii. [surf_]gp_hgt_err
iii. h2o_liq_mol_lay_err iv. mw_[surf_]air_temp_err v. mw_surf_temp_err
vi. CLIMCAPS surf_ir_emis_err, cld_frac_err, cld_top_pres_err, for_cld_frac_tot_err, for_cld_top_pres_tot_err, for_cld_frac_2lay_err, for_cld_top_pres_2lay_err, h2o_liq_tot_err
vii. CLIMCAPS cloud-cleared radiances, rad_*w_err d) CLIMCAPS co2_mol_lay is all fill values, but retrieved CO2 info is available in VMR
units in aux/co2_vmr. e) Even though the description of o3_mmr and co_mmr_midtrop says they are MMR to
moist air, the values are calculated as MMR to dry air. The differences are very small.
4.0OptionsforReadingtheDataTheproductfilesarewritteninnetCDF4/HDF5.BecausenetCDF4buildsupontheclassicnetCDFdatamodelusingHDF5asthestoragelayer,auserofthedataproductcantakefulladvantageoftoolsandlibrariesreadilyavailabletoaccessthedata.EverynetCDF4fileisconsideredanHDF5file,however,noteveryHDF5fileisnecessarilyanetCDF4file.AlimitedsubsetoftheHDF5datamodelandfileformatfeaturesareusedinnetCDF4files.ConformancetotheearliermentionedCF&ACDDstandardsallowsforuserstotakeadvantageofmostnetCDFinterfaces.ToolsandlibrariesforreadingnetCDF4aswellasanetCDFUsers’GuidearewrittenandmaintainedbyUnidataandcanbefoundonlineat:
http://www.unidata.ucar.edu/software/netcdf/
Panoplyisagoodtoolforvisualizingthesefiles.https://www.giss.nasa.gov/tools/panoply/ThereareanumberofinterfacesavailableforreadingnetCDFfordifferentprogramminglanguagesincluding:C/C++,Fortran,Matlab,IDL,PythonandPerl.ThefilescanalsobeaccessedwithHDF5toolsandlibrariesavailableat:
https://www.hdfgroup.org/products/hdf5_tools/
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5.0DataServices
TheproductsareavailabletotheusercommunityviatheGoddardDistributedActiveArchiveCenter(GDAAC).https://disc.gsfc.nasa.gov/ InadditiontothenetCDFdatafiles,thereyoucanalsogetdailygranulemaps,showingthelocationofeachgranuleofeachday.
Figure4.Granulemapfornighttimedata2016-01-14.Granule101isusedinApp
DataattheGDAACisorganizedbyuniqueshortnamesandversionnumbers.
Table5.1Shortnamesshortname.version Description
CHART+CLIMCAPSLevel-2productsdescribedinthisdocumentSNDRSNIML2CCPRETN.1 CLIMCAPSLevel-2retrievedproductSNDRSNIML2CCPCCRN.1 CLIMCAPSLevel-2Cloud-clearedradiancesSNDRSNIML2CHTRETN.1 CHARTLevel-2retrievedproductSNDRSNIML2CHTCCRN.1 CHARTLevel-2Cloud-clearedradiances
RelateddatasetsatGDAACN/A (on demand) SNPPgranulemapsSNPPCrISL1BNSR.1 SNPPCrISLevel1BNormalSpectralResolutionV1
7
8
9
10
11
12
24
25
26
27
28
29
41
42
43
44
45
46
58
59
60
61
62
63
75
76
77
78
79
80
92
93
94
95
96
97
109
110
111
112
113
114
126
127
128
129
130
131
143
144
145
146
147
148
160
161
162
163
164
165
177
178
179
180
181
182
194
195
196
197
198
199
210
211
212
213
214
215
227
228
229
230
231
232
Ascending Data
SNPPCrIS Files: 240
14 Jan 2016DoY 14
SNPP Day 1539
1
2
3
4
16
17
18
19
20
21
33
34
35
36
37
38
50
51
52
53
54
55
67
68
69
70
71
72
84
85
86
87
88
89
101
102
103
104
105
106
117
118
119
120
121
122
134
135
136
137
138
139
151
152
153
154
155
156
168
169
170
171
172
173
185
186
187
188
189
190
202
203
204
205
206
207
219
220
221
222
223
224
236
237
238
239
240
Descending Data
Legend: CrIS Available Created on 2018-04-19 16:16:15 PDT by [email protected]
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usedasinputfortheseretrievalsSNPPATMSL1B.1 SNPPATMSLevel1BBrightnessTemperatureV1
usedasinputfortheseretrievalsSNDRSNIML3DCCPN.1 CLIMCAPSLevel-31-dayretrievedproductSNDRSNIML3MCCPN.1 CLIMCAPSLevel-3monthlyretrievedproductSNDRSNIML3DCHTN.1 CHARTLevel-31-dayretrievedproductSNDRSNIML3MCHTN.1 CHARTLevel-3monthlyretrievedproduct
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AppendixA:DifferencesbetweenCLIMCAPSandCHARTalgorithmsAlthoughCHARTandCLIMCAPSshareacommonheritage,therearesignificantdifferencesinimplementation.Theyusedifferentchannelsandverticalbasisfunctionsamongotherchanges.PleaseseetheirrespectiveATBDdocumentsforfulldetails.Hereareafewkeydifferences.A.1Firstguess
CLIMCAPSstartsfromabackgroundgeophysicalstatederivedfromMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess).CHARTstartsfromtheresultsofaneuralnetusingCrIMSSdata,andtrainedusingECMWFforecasts.ThisneuralnetisStochasticCloudClearingNeuralNet(SCCNN),andisprovidedbyAdamMilsteinofMIT.A.2Iteration
CHARTconvergesthroughseveraliterationsofcloudclearingandrefininggeophysicalstate;CLIMCAPSdoesonlyasinglecloudclearing. A.3Errorestimationapproach
CLIMCAPSerrorestimatesareproducedaspartoftheSVDretrieval.CHARTusesaregressiontrainedonECMWFdatatopredictlikelyerrors.A.4QualityControlapproach
Bothproductsincludevariableswithnamesendingin“_qc”tellingwhichvaluesaresafetouse(0:bestquality;1:goodquality,2:donotuse)butthevaluesarederiveddifferently.CLIMCAPSdeclareseachretrievalassuccessfulornotbasedonwhetherallstepsoftheretrievalwereabletoexecutesuccessfully,sothevaluesforalmostallquantitiesandlevelsareidentical.CHARTusesthresholdsbasedonthepredictederrorlevels,appliedindividuallytodifferentretrievedparametersandatmosphericlevels.
A.5Retrievedquantities
Afterthecoreretrievaloftemperature,watervapor,clouds,andozone,CHARTandCLIMCAPSadddifferentadditionalretrievals.
CHARThasvariousOutgoingLongwaveRadiation(OLR),independentper-FOVcloudpressure,andaninfrared-basedprecipitationestimate.
CLIMCAPSretrievestheseadditionalgases:HNO3,SO2,N2O,andCO2.Forthev1release,theyareconsideredpreliminaryandonlyprovidedinthemol_layorauxsubgroups.
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AppendixB:SampleimagesTheseimagesfor2016-01-14granule101(gran_id=20160114T1005)weregeneratedwithPanoply.WeshowCLIMCAPSair_tempforlevel87,whichis75400Pa(=754hPa).ThisgranulecoversthewesternpartoftheUSandtheadjacentpartofthePacificOceanatnight.Someofthetallermountainsbringthesurfacepressurebelow75400hPa,sonodataispresentfortheseFORs.
Nextwelookatthislevelofair_tempinasimplerectangulargridofatrackxxtrack.ThePacificOceanisnowatthetopofeachimageandtheRockyMountainsnearthebottom.Thismeanswe’reactuallylookingoutfrominsidetheEarth.ThetableshowsCLIMCAPSandCHARTimagesforthislevel,withassociatederrorestimatesandQC.
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CLIMCAPS CHARTair_temp
air_temp_err
air_temp_qc
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Lookingatthecloud-clearedradianceproduct,LWchannel401,898.75cm-1.
CLIMCAPS CHARTrad_lw
rad_lw_err
N/A(allfiller)
rad_lw_qc
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AppendixC:DetailedfileformatsThese tables show all of the dimensions, global attributes, and variables in the four product types. For clarity, some variable attributes are omitted, including long_name, standard_name, coverage_content_type, axis, valid_range, coordinates, and _FillValue. Ancillary variables are also omitted. The presence of “bnds” in the ancillary_variables column for “lat” means that there is also a variable named “lat_bnds”. To get a complete listing including all variable attributes, apply “ncdump -h” to any netCDF4 product file.
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C.1CLIMCAPSRetrievalproduct
SNPPL2CLIMCAPSCRIMSSInterfaceSpecificationInterfaceSpecificationVersion02.00.28
04-10-2019GlobalGroups
Path Description
/ Mainsciencedata
/mw MW-Onlydata
/mol_lay Layermoleculeamounts
/aux Internalproductteamdata
GlobalDimensions
Name Size Description
spatial 3 directions:x,y,z forsatellitepositionandvelocity
fov_poly 8 latitude/longitudepointsdefiningthepolygonboundinganFOV(anticlockwiseasviewedfromabove)
utc_tuple 8 partsofUTCtime:year,month,day,hour,minute,second,millisec,microsec
attitude 3 roll,pitch,yaw
fov 9 Field-of-viewdimension
atrack 45 along-trackhorizontaldimension
xtrack 30 cross-trackhorizontaldimension
air_pres 100 Fineatmosphericpressurelevelsstartingfromthetop
air_pres_h2o 66 Fineatmosphericpressurelevelsstartingfromthetop
air_pres_lay 100 Fineatmosphericpressurelayersstartingfromthetop
surf_wnum_ir 100 IRsurfaceemissivityhingepoints
surf_freq_mw 7 MWsurfaceemissivityhingepoints
cld_lay 2 Measuredcloudlayers:top,bottom
bnds_1d 2 Boundariesfor1-dfieldslikeair_pres_lay:min,max
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GlobalAttributes
Name Type Size Value Description
keywords string 1
ATMOSPHERE>ATMOSPHERICTEMPERATURE>UPPERAIRTEMPERATURE\,ATMOSPHERE>ATMOSPHERICWATERVAPOR>WATERVAPOR
Acomma-separatedlistofkeywordsand/orphrases.Keywordsmaybecommonwordsorphrases,termsfromacontrolledvocabulary(GCMDisoftenused),orURIsfortermsfromacontrolledvocabulary(seealso"keywords_vocabulary"attribute).
Conventions string 1 CF-1.6\,ACDD-1.3 Acomma-separatedlistoftheconventionsthatarefollowedbythedataset.
history string 1
Providesanaudittrailformodificationstotheoriginaldata.ThisattributeisalsointheNetCDFUsersGuide:'Thisisacharacterarraywithalineforeachinvocationofaprogramthathasmodifiedthedataset.Well-behavedgenericnetCDFapplicationsshouldappendalinecontaining:date,timeofday,username,programnameandcommandarguments.'ToincludeamorecompletedescriptionyoucanappendareferencetoanISOLineageentity;seeNOAAEDMISOLineageguidance.
source string 1 CrISandATMSinstrumenttelemetry
Themethodofproductionoftheoriginaldata.Ifitwasmodel-generated,sourceshouldnamethemodelanditsversion.Ifitisobservational,sourceshouldcharacterizeit.ThisattributeisdefinedintheCFConventions.Examples:'temperaturefromCTD#1234';'worldmodelv.0.1'.
processing_level string 1 2 Atextualdescriptionoftheprocessing(orqualitycontrol)levelofthedata.
product_name_type_id string 1 L2_CLIMCAPS_RET_NSR Productnameasitappearsinproduct_name(L1A,L1B,L2,SNO_AIRS_CrIS)
comment string 1 Miscellaneousinformationaboutthedataormethodsusedtoproduceit.Canbeempty.
acknowledgment string 1 SupportforthisresearchwasprovidedbyNASA.
Aplacetoacknowledgevarioustypesofsupportfortheprojectthatproducedthisdata.
license string 1 LimitedtoSounderSIPSaffiliates
ProvidetheURLtoastandardorspecificlicense,enter"FreelyDistributed"or"None",ordescribeanyrestrictionstodataaccessanddistributioninfreetext.
standard_name_vocabulary string 1 CFStandardNameTablev28
Thenameandversionofthecontrolledvocabularyfromwhichvariablestandardnamesaretaken.(Valuesforanystandard_nameattributemustcomefromtheCFStandardNamesvocabularyforthedatafileorproducttocomplywithCF.)Example:'CFStandardNameTablev27'.
date_created string 1 Unassigned
Thedateonwhichthisversionofthedatawascreated.(Modificationofvaluesimpliesanewversion,hencethiswouldbeassignedthedateofthemostrecentvaluesmodification.)
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Name Type Size Value Description
Metadatachangesarenotconsideredwhenassigningthedate_created.TheISO8601:2004extendeddateformatisrecommended,asdescribedintheAttributeContentGuidancesection.
creator_name string 1 UnassignedThenameoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_email string 1 Unassigned
Theemailaddressoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_url string 1 UnassignedTheURLoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
institution string 1 Unassigned Processingfacilitythatproducedthisfile
project string 1 SounderSIPS
Thenameoftheproject(s)principallyresponsiblefororiginatingthisdata.Multipleprojectscanbeseparatedbycommas,asdescribedunderAttributeContentGuidelines.Examples:'PATMOS-X','ExtendedContinentalShelfProject'.
product_name_project string 1 SNDRThenameoftheprojectasitappearsinthefilename.'SNDR'forallSounderSIPSproducts,evenAIRSproducts.
publisher_name string 1 Unassigned
Thenameoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_email string 1 Unassigned
Theemailaddressoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_url string 1 Unassigned
TheURLoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
geospatial_bounds string 1
Describesthedata's2Dor3DgeospatialextentinOGC'sWell-KnownText(WKT)Geometryformat(referencetheOGCSimpleFeatureAccess(SFA)specification).Themeaningandorderofvaluesforeachpoint'scoordinatesdependsonthecoordinatereferencesystem(CRS).TheACDDdefaultis2DgeometryintheEPSG:4326coordinatereferencesystem.Thedefaultmaybeoverriddenwithgeospatial_bounds_crsandgeospatial_bounds_vertical_crs(seethoseattributes).EPSG:4326coordinatevaluesarelatitude(decimaldegrees_north)andlongitude
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Name Type Size Value Description
(decimaldegrees_east),inthatorder.Longitudevaluesinthedefaultcasearelimitedtothe-180,180)range.Example:'POLYGON((40.26-111.29,41.26-111.29,41.26-110.29,40.26-110.29,40.26-111.29))'.
geospatial_bounds_crs string 1 EPSG:4326
Thecoordinatereferencesystem(CRS)ofthepointcoordinatesinthegeospatial_boundsattribute.ThisCRSmaybe2-dimensionalor3-dimensional,buttogetherwithgeospatial_bounds_vertical_crs,ifthatattributeissupplied,mustmatchthedimensionality,order,andmeaningofpointcoordinatevaluesinthegeospatial_boundsattribute.Ifgeospatial_bounds_vertical_crsisalsopresentthenthisattributemustonlyspecifya2DCRS.EPSGCRSsarestronglyrecommended.Ifthisattributeisnotspecified,theCRSisassumedtobeEPSG:4326.Examples:'EPSG:4979'(the3DWGS84CRS),'EPSG:4047'.
geospatial_lat_min float 1 9.9692099683868690e+36f
Describesasimplelowerlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_minspecifiesthesouthernmostlatitudecoveredbythedataset.
geospatial_lat_max float 1 9.9692099683868690e+36f
Describesasimpleupperlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_maxspecifiesthenorthernmostlatitudecoveredbythedataset.
geospatial_lon_min float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_minspecifiesthewesternmostlongitudecoveredbythedataset.Seealsogeospatial_lon_max.
geospatial_lon_max float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_maxspecifiestheeasternmostlongitudecoveredbythedataset.Caseswheregeospatial_lon_minisgreaterthangeospatial_lon_maxindicatetheboundingboxextendsfromgeospatial_lon_max,throughthelongituderangediscontinuitymeridian(eithertheantimeridianfor-180:180values,orPrimeMeridianfor0:360values),togeospatial_lon_min;forexample,geospatial_lon_min=170andgeospatial_lon_max=-175incorporates15degreesoflongitude(ranges170to180and-180to-175).
time_coverage_start string 1
Nominalstarttime.Describesthetimeofthefirstdatapointinthedataset.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_first_valid_obs string 1 Describesthetimeofthefirstvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
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Name Type Size Value Description
time_coverage_mid string 1
Describesthemidpointbetweenthenominalstartandendtimes.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_coverage_end string 1
Nominalendtime.Describesthetimeofthelastdatapointinthedataset.UseISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_last_valid_obs string 1 Describesthetimeofthelastvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
time_coverage_duration string 1 P0000-00-00T00:06:00
Describesthedurationofthedataset.UseISO8601:2004durationformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
product_name_duration string 1 m06 Productdurationasitappearsinproduct_name(m06meanssixminutes)
creator_type string 1 institution
Specifiestypeofcreatorwithoneofthefollowing:'person','group','institution',or'position'.Ifthisattributeisnotspecified,thecreatorisassumedtobeaperson.
creator_institution string 1JetPropulsionLaboratory--CaliforniaInstituteofTechnology
Theinstitutionofthecreator;shoulduniquelyidentifythecreator'sinstitution.Thisattribute'svalueshouldbespecifiedevenifitmatchesthevalueofpublisher_institution,orifcreator_typeisinstitution.
product_version string 1 v01.00.00
Versionidentifierofthedatafileorproductasassignedbythedatacreator.Forexample,anewalgorithmormethodologycouldresultinanewproduct_version.
keywords_vocabulary string 1 GCMD:GCMDKeywords
Ifyouareusingacontrolledvocabularyforthewords/phrasesinyour"keywords"attribute,thisistheuniquenameoridentifierofthevocabularyfromwhichkeywordsaretaken.Ifmorethanonekeywordvocabularyisused,eachmaybepresentedwithaprefixandafollowingcomma,sothatkeywordsmayoptionallybeprefixedwiththecontrolledvocabularykey.Example:'GCMD:GCMDKeywords,CF:NetCDFCOARDSClimateandForecastStandardNames'.
platform string 1SUOMI-NPP>SuomiNationalPolar-orbitingPartnership
Nameoftheplatform(s)thatsupportedthesensordatausedtocreatethisdatasetorproduct.Platformscanbeofanytype,includingsatellite,ship,station,aircraftorother.Indicatecontrolledvocabularyusedinplatform_vocabulary.
platform_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"platform"attribute.
product_name_platform string 1 SNPP Platformnameasitappearsinproduct_name
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Name Type Size Value Description
instrument string 1
CRIMSS>Cross-trackInfraredandAdvancedTechnologyMicrowaveSounders\,CrIS>Cross-trackInfraredSounder\,ATMS>AdvancedTechnologyMicrowaveSounder
Nameofthecontributinginstrument(s)orsensor(s)usedtocreatethisdatasetorproduct.Indicatecontrolledvocabularyusedininstrument_vocabulary.
instrument_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"instrument"attribute.
product_name_instr string 1 CRIMSS Instrumentnameasitappearsinproduct_name
product_name string 1 Canonicalfullyqualifiedproductname(officialfilename)
product_name_variant string 1 std
Processingvariantidentifierasitappearsinproduct_name.'std'(shorthandfor'standard')istobethedefaultandshouldbewhatisseeninallpublicproducts.
product_name_version string 1 vxx_xx_xx Versionnumberasitappearsinproduct_name(v01_00_00)
product_name_producer string 1 TProductionfacilityasitappearsinproduct_name(singlecharacter)'T'isthedefault,forunofficiallocaltestproducts
product_name_timestamp string 1 yymmddhhmmss Processingtimestampasitappearsinproduct_name(yymmddhhmmss)
product_name_extension string 1 nc Fileextensionasitappearsinproduct_name(typicallync)
granule_number ushort 1 granulenumberofday(1-240)
product_name_granule_number string 1 g000 zero-paddedstringforgranulenumberofday(g001-g240)
gran_id string 1 yyyymmddThhmmUniquegranuleidentifieryyyymmddThhmmofgranulestart,includingyear,month,day,hour,andminuteofgranulestarttime
geospatial_lat_mid float 1 9.9692099683868690e+36f granulecenterlatitude
geospatial_lon_mid float 1 9.9692099683868690e+36f granulecenterlongitude
featureType string 1 point structureofdatainfile
data_structure string 1 swath
acharacterstringindicatingtheinternalorganizationofthedatawithcurrentlyallowedvaluesof'grid','station','trajectory',or'swath'.The'structure'heregenerallydescribesthehorizontalstructureandinallcasesdatamayalsobefunctions,forexample,ofaverticalcoordinateand/ortime.(IfusingCMORpassthisinacalltocmor_set_cur_dataset_attribute.)
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Name Type Size Value Description
cdm_data_type string 1 Swath
Thedatatype,asderivedfromUnidata'sCommonDataModelScientificDatatypesandunderstoodbyTHREDDS.(ThisisaTHREDDS"dataType",andisdifferentfromtheCFNetCDFattribute'featureType',whichindicatesaDiscreteSamplingGeometryfileinCF.)
id string 1 Unassigned
Anidentifierforthedataset,providedbyanduniquewithinitsnamingauthority.Thecombinationofthe"namingauthority"andthe"id"shouldbegloballyunique,buttheidcanbegloballyuniquebyitselfalso.IDscanbeURLs,URNs,DOIs,meaningfultextstrings,alocalkey,oranyotheruniquestringofcharacters.Theidshouldnotincludewhitespacecharacters.
naming_authority string 1 Unassigned
Theorganizationthatprovidestheinitialid(seeabove)forthedataset.Thenamingauthorityshouldbeuniquelyspecifiedbythisattribute.Werecommendusingreverse-DNSnamingforthenamingauthority;URIsarealsoacceptable.Example:'edu.ucar.unidata'.
identifier_product_doi string 1 Unassigned digitalsignature
identifier_product_doi_authority string 1 Unassigned digitalsignaturesource
algorithm_version string 1
Theversionofthealgorithminwhateverformatisselectedbythedevelopers.Afterthemainalgorithmnameandversion,versionsfrommultiplesub-algorithmsmaybeconcatenatedwithsemicolonseparators.(ex:'CCAST4.2;BBemisfromMIT2016-04-01')Mustbeupdatedwitheverydeliverythatchangesnumericalresults.
production_host string 1 Identifyinginformationaboutthehostcomputerforthisrun.(Outputoflinux"uname-a"command.)
format_version string 1 v02.00.29 Formatversion.
input_file_names string 1 Semicolon-separatedlistofnamesoruniqueidentifiersoffilesthatwereusedtomakethisproduct.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_types string 1 Semicolon-separatedlistoftagsgivingtheroleofeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_dates string 1 Semicolon-separatedlistofcreationdatesforeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
orbitDirection string 1 Orbitisascendingand/ordescending.Valuesare"Ascending"or"Descending"iftheentiregranulefitsthatdescription."NorthPole"and"SouthPole"areusedforpolar-crossing
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Name Type Size Value Description
granules."NA"isusedwhenadeterminationcannotbemade.
day_night_flag string 1
Dataisdayornight."Day"meanssubsatellitepointforallvalidscanshassolarzenithanglelessthan90degrees."Night"meanssubsatellitepointforallvalidscanshassolarzenithanglegreaterthan90degrees."Both"meansthedatasetcontainsvalidobservationswithsolarzenithangleaboveandbelow90degrees."NA"meansavaluecouldnotbedetermined.
AutomaticQualityFlag string 1 Missing
"Passed":thegranulecontainsanon-degradedcalibratedbrightnesstemperature,radiance,orretrievedvalueforatleastonevalueinageolocatedFOV;"Suspect":thegranuledoesnotqualifyas"Passed"butcontainsa(possiblydegraded)calibratedorretrievedvalue(possiblywithoutassociatedgeolocation);"Failed":thegranulecontainsnocalibratedorretrievedvalues.
qa_pct_data_missing float 1 Percentageofexpectedobservationsthataremissing.
qa_pct_data_geo float 1 Percentageofexpectedobservationsthataresuccessfullygeolocated.
qa_pct_data_sci_mode float 1 Percentageofexpectedobservationsthatweretakenwhiletheinstrumentwasinsciencemodeandaresuccessfullygeolocated.
qa_no_data string 1 TRUEAsimpleindicatorofwhetherthisisan"empty"granulewithnodatafromtheinstrument."TRUE"or"FALSE".
title string 1 Level-2CLIMCAPSSNPPCrIMSS
asuccinctdescriptionofwhatisinthedataset.(=ECSlongname)
summary string 1
TheLevel-2CLIMCAPSproductincludesatmosphericstateretrievalproductsfromtheCLIMCAPSalgorithmforonesix-minuteinterval.Theseincludetemperatureandwatervaporprofilesaswellascloudandsurfaceproductsandminorgases.
Aparagraphdescribingthedataset,analogoustoanabstractforapaper.
shortname string 1 SNDRSNIML2CCPRETN ECSShortName
product_group string 1 l2_crimssThegroupnametobeusedforthisproductwhenitiscollectedinamulti-groupfiletype,likeSNOorcalsub.
metadata_link string 1 UnassignedAURLthatgivesthelocationofmorecompletemetadata.ApersistentURLisrecommendedforthisattribute.
references string 1 ATDBanddesigndocumentsdescribingprocessingalgorithms.Canbeempty.
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Name Type Size Value Description
contributor_name string 1
ChristopherD.Barnet\,STC;L.LarrabeeStrow\,UMBC;PhilipW.Rosenkranz\,MIT
Thenamesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
contributor_role string 1 RetrievalPI;ForwardModelPI;MicrowavePI
Therolesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
GlobalVariables
Name Type Dimensions Description Units
AncillaryVariables
obs_id string atrack,xtrack
uniqueearthviewobservationidentifier:yyyymmddThhmm.aaExx.Includesgran_idplus2-digitalong-trackindex(01-45)and2-digitcross-trackindex(01-30).
fov_obs_id string atrack,xtrack,fov
uniqueearthviewobservationidentifierforFOV:yyyymmddThhmm.aaExx.f.Includesgran_idplus2-digitalong-trackindex(01-45),2-digitcross-trackindex(01-30),and1-digitFOVnumber(1-9).
obs_time_tai93 double
atrack,xtrack earthviewobservationmidtimeforeachFOV
secondssince1993-01-0100:00
bnds
obs_time_utc uint16
atrack,xtrack,utc_tuple
UTCearthviewobservationtimeasanarrayofintegers:year,month,day,hour,minute,second,millisec,microsec
lat float atrack,xtrack latitudeofFORcenter degrees_nor
th bnds
lat_geoid float atrack,xtrack
latitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_north
fov_lat float atrack,xtrack,fov latitudeofFOVcenter degrees_nor
th bnds
lon float atrack,xtrack longitudeofFORcenter degrees_eas
t bnds
lon_geoid float atrack,xtrack
longitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_east
fov_lon float atrack,xtrack,fov longitudeofFOVcenter degrees_eas
t bnds
land_frac float atrack,xtrack landfractionovertheFOR unitless
fov_land_frac float atrack,xtrack,fov landfractionovertheFOV unitless
surf_alt float atrack,xtrack meansurfacealtitudewrtearthmodelovertheFOR m
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Name Type Dimensions Description Units
AncillaryVariables
fov_surf_alt float atrack,xtrack,fov meansurfacealtitudewrtearthmodelovertheFOV m
surf_alt_sdev float atrack,xtrack standarddeviationofsurfacealtitudewithintheFOR m
fov_surf_alt_sdev float atrack,xtrack,fov standarddeviationofsurfacealtitudewithintheFOV m
sun_glint_lat float atrack sunglintspotlatitudeatscan_mid_time.Fillfornightobservations.
degrees_north
sun_glint_lon float atrack sunglintspotlongitudeatscan_mid_time.Fillfornightobservations.
degrees_east
sol_zen float atrack,xtrack solarzenithangleatthecenterofthespot degree
sol_azi float atrack,xtrack
solarazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sun_glint_dist float atrack,xtrack
distanceofsunglintspottothecenterofthespot.Fillfornightobservations. m
view_ang float atrack,xtrack offnadirpointingangle degree
sat_zen float atrack,xtrack satellitezenithangleatthecenterofthespot degree
sat_azi float atrack,xtrack
satelliteazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sat_range float atrack,xtrack
lineofsightdistancebetweensatelliteandspotcenter m
asc_flag ubyte atrack ascendingorbitflag:1ifascending,0descending
subsat_lat float atrack sub-satellitelatitudeatscan_mid_time degrees_north
subsat_lon float atrack sub-satellitelongitudeatscan_mid_time degrees_east
scan_mid_time double atrack TAI93atmiddleofearthscenescans
secondssince1993-01-0100:00
sat_alt float atrack satellitealtitudewithrespecttoearthmodelatscan_mid_time m
sat_pos float atrack,spatial satelliteECRpositionatscan_mid_time m
sat_vel float atrack,spatial satelliteECRvelocityatscan_mid_time ms-1
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Name Type Dimensions Description Units
AncillaryVariables
sat_att float atrack,attitude
satelliteattitudeatscan_mid_time.Anorthogonaltriad.Firstelementisangleaboutthe+x(roll)ORBaxis.+xaxisispositivelyorientedinthedirectionoforbitalflight.Secondelementisangleabout+y(pitch)ORBaxis.+yaxisisorientednormaltotheorbitplanewiththepositivesenseoppositetothatoftheorbit'sangularmomentumvectorH.Thirdelementisangleabout+z(yaw)axis.+zaxisispositivelyorientedEarthwardparalleltothesatelliteradiusvectorRfromthespacecraftcenterofmasstothecenteroftheEarth.
degree
local_solar_time float atrack,xtrack localapparentsolartimeinhoursfrommidnight hours
mean_anom_wrt_equat float atrack spacecraftmeananomalymeasuredwithrespectto
theascendingnode degree
sat_sol_zen float atrack solarzenithangleatthesatellite degree
sat_sol_azi float atrack solarazimuthangleatthesatellite(clockwisefromNorth) degree
asc_node_lon float Longitudeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
degrees_east
asc_node_tai93 double
TAI93timeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
secondssince1993-01-0100:00
asc_node_local_solar_time float localapparentsolartimeatthelastascendingnode
beforetime_coverage_endinhoursfrommidnight hours
solar_beta_angle float Betaangleforthespacecraftorbit,determiningthepercentageoftheorbitthatthespacecraftisindirectsunlight.
degree
attitude_lbl string attitude listofrotationaldirections(roll,pitch,yaw)
spatial_lbl string spatial listofspatialdirections(X,Y,Z)
utc_tuple_lbl string utc_tuple
namesoftheelementsofUTCwhenitisexpressedasanarrayofintegersyear,month,day,hour,minute,second,millisecond,microsecond
air_temp float32
atrack,xtrack,air_pres
airtemperatureprofile Kelvin err,qc
surf_air_temp float32
atrack,xtrack
near-surfaceairtemperature(~2metersabovesurface) Kelvin err,qc
air_temp_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationabouttheairtemperatureprofileprovidedbythephysicalretrievalstep.
unitless
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Name Type Dimensions Description Units
AncillaryVariables
h2o_vap_tot float32
atrack,xtrack totalprecipitablewatervapor kg/m2 err,qc
spec_hum float32
atrack,xtrack,air_pres_h2o
massfractionofwatervaporinmoistair unitless err,qc
surf_spec_hum float32
atrack,xtrack
Near-surfacemassfractionofwatervaporinmoistair unitless err,qc
h2o_vap_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthewatervaporprofileprovidedbythephysicalretrievalstep.
unitless
rel_hum float32
atrack,xtrack,air_pres_h2o
relativehumidityoverequilibriumphase unitless err,qc
surf_rel_hum float32
atrack,xtrack
relativehumiditynearthesurfaceoverequilibriumphase unitless err,qc
spec_hum_sat_ice float32
atrack,xtrack,air_pres_h2o
saturationspecifichumidityinequilibriumwithice unitless err,qc
surf_spec_hum_sat_ice float32
atrack,xtrack
Near-surfacesaturationspecifichumidityinequilibriumwithice unitless err,qc
spec_hum_sat_liq float32
atrack,xtrack,air_pres_h2o
saturationspecifichumidityinequilibriumwithliquidwater unitless err,qc
surf_spec_hum_sat_liq float32
atrack,xtrack
Near-surfacesaturationspecifichumidityinequilibriumwithliquidwater unitless err,qc
gp_hgt float32
atrack,xtrack,air_pres
Geopotentialisthesumofthespecificgravitationalpotentialenergyrelativetothegeoidandthespecificcentripetalpotentialenergy.Geopotentialheightisthegeopotentialdividedbythestandardaccelerationduetogravity.
m err,qc
surf_gp_hgt float32
atrack,xtrack geopotentialheightatthesurface m err,qc
o3_tot float32
atrack,xtrack
Totalcolumnozone.(Multiplyby4.670e5toconverttoDobsonUnitsfromkgm^-2) kgm-2 err,qc
o3_mmr float32
atrack,xtrack,air_pres
ozonemassmixingratiotomoistair unitless err,qc
o3_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationabouttheozoneprofileprovidedbythephysicalretrievalstep.
unitless
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Name Type Dimensions Description Units
AncillaryVariables
co_mmr_midtrop float32
atrack,xtrack
Carbonmonoxidemassmixingratiotomoistairat50000Pa,nearthepeakofsensitivity unitless err,qc
co_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthecarbonmonoxideprofileprovidedbythephysicalretrievalstep.
unitless
ch4_mmr_midtrop float32
atrack,xtrack
Methanemassmixingratiotomoistairat40000Pa,nearthepeakofsensitivity unitless err,qc
ch4_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthemethaneprofileprovidedbythephysicalretrievalstep.
unitless
co2_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthecarbondioxideprofileprovidedbythephysicalretrievalstep.
unitless
n2o_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthenitrousoxideprofileprovidedbythephysicalretrievalstep.
unitless
hno3_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthenitricacidprofileprovidedbythephysicalretrievalstep.
unitless
so2_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthesulfurdioxideprofileprovidedbythephysicalretrievalstep.
unitless
mw_cld_phase int16atrack,xtrack,air_pres_lay
CloudIce/Waterflagfrommicrowave.0forliquidcloudsornoclouds;1foriceclouds.
h2o_liq_tot float32
atrack,xtrack totalcolumncloudliquidwater kgm-2 err,qc
h2o_liq_mol_lay float32
atrack,xtrack,air_pres_lay
cloudliquidwaterlayertotal unitless err,qc
surf_temp float32
atrack,xtrack radiativetemperatureofthesurface Kelvin err,qc
surf_temp_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthesurfaceskintemperatureprovidedbythephysicalretrievalstep.
unitless
surf_ir_emis float32
atrack,xtrack,surf_wnum_ir
infraredsurfaceemissivity unitless err,qc
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Name Type Dimensions Description Units
AncillaryVariables
surf_ir_refl float32
atrack,xtrack,surf_wnum_ir
infraredsurfacereflectivity unitless qc
surf_ir_wnum_cnt int16 atrack,xtrack Numberofinfraredsurfaceemissivityfrequencies unitless
surf_ir_wnum float32
atrack,xtrack,surf_wnum_ir
Surfaceinfraredemissivityfrequencies(hingepoints) cm-1
surf_mw_emis float32
atrack,xtrack,surf_freq_mw
Microwavesurfaceemissivity unitless err,qc
cld_frac float32
atrack,xtrack,fov,cld_lay
effectivecloudfraction unitless err,qc
cld_top_pres float32
atrack,xtrack,fov,cld_lay
cloudtoppressureinorderofincreasingpressure Pa err,qc
cld_top_temp float32
atrack,xtrack,fov,cld_lay
cloudtoptemperature Kelvin err,qc
num_cld byte atrack,xtrack,fov Numberofcloudlayerswithnonzerocloudfraction unitless
tpause_gp_hgt float32
atrack,xtrack
tropopausegeopotentialheight,wheretropopauseisdeterminedaccordingtotheWMOdefinition m qc
tpause_pres float32
atrack,xtrack
tropopausepressure,wheretropopauseisdeterminedaccordingtotheWMOdefinition Pa qc
tpause_temp float32
atrack,xtrack
tropopausetemperature,wheretropopauseisdeterminedaccordingtotheWMOdefinition Kelvin qc
air_pres_nsurf int16 atrack,xtrack
Indexinair_presofthelevelatthesurface.Valuesatlevelsbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres_h2o_nsurf int16 atrack,xtrack
Indexinair_pres_h2oofthelevelatthesurface.Valuesatlevelsbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres_lay_nsurf int16 atrack,xtrack
Indexinair_pres_layofthelayeratthesurface.Valuesforlayersbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres float32 air_pres pressurelevels Pa
air_pres_h2o float32
air_pres_h2o H2Ovaporpressurelevels Pa
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Name Type Dimensions Description Units
AncillaryVariables
air_pres_lay float32 air_pres_lay pressureatthemiddleofeachlayer Pa bnds
cld_lay_lbl string cld_lay Cloudlayer{top,bottom}
mw_surf_class int16 atrack,xtrack
Microwavespectralsurfaceclass.0forcoastline;1forland;2forocean;3forfirst-yearsea-ice;4formulti-yearsea-ice;5forsnow(higher-freqscattering);6forglacier/snow(verylow-freqscattering);7forsnow(lower-freqscattering);
surf_freq_mw float32
surf_freq_mw
Microwavesurfaceemissivityfrequencies(hingepoints) Hz
auxVariables
Name Type Dimensions Description Units AncillaryVariables
co2_vmr float32atrack,xtrack,air_pres
carbondioxidevolumemixingratio unitless err,qc
for_cld_frac_tot float32 atrack,xtrack Field-Of-Regardeffectivecloudfractionsummedoverallcloudlayers unitless err,qc
for_cld_top_pres_tot float32 atrack,xtrack Field-Of-Regardweightedcloudtoppressure Pa err,qc
for_cld_frac_2lay float32atrack,xtrack,cld_lay
Effectivecloudfractionassuming2commoncloudlayersoverthewholeField-Of-Regard unitless err,qc
for_cld_top_pres_2lay float32atrack,xtrack,cld_lay
Cloudtoppressureassuming2commoncloudlayersoverthewholeField-of-Regard Pa err,qc
clim_o3_mol_lay float32atrack,xtrack,air_pres_lay
Ozonecolumndensityon100layersfromtheclimatologyfirstguess
molecules/m2
clim_surf_ir_emis float32atrack,xtrack,surf_wnum_ir
Infraredsurfaceemissivityfromtheclimatologyfirstguess unitless
clim_surf_ir_refl float32atrack,xtrack,surf_wnum_ir
infraredsurfacereflectivityfromtheclimatologyfirstguess unitless
clim_surf_ir_wnum_cnt int16 atrack,xtrack Numberofinfraredsurfaceemissivityfrequenciesfortheclimatologyfirstguess unitless
clim_surf_ir_wnum float32atrack,xtrack,surf_wnum_ir
Surfaceinfraredemissivityfrequencies(hingepoints)fortheclimatologyfirstguess cm-1
clim_co2_mmr float32 atrack,xtrack Assumedcarbondioxideconcentration unitless
prior_surf_pres float32 atrack,xtrack surfacepressurefromforecast Pa
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Name Type Dimensions Description Units AncillaryVariables
prior_sea_lev_pres float32 atrack,xtrack sealevelsurfacepressurefromforecast Pa
idprof string atrack,xtrack profileID
etarej float32 atrack,xtrack cloudclearingresidualusedf/rejatiteration=ieta_rej unitless
cldfrc_tot float32 atrack,xtrack TotalcloudfractionoverFOR unitless
cldfrc_500 float32 atrack,xtrack TotalcloudfractionoverFORbelow500hPa unitless
ampl_eta float32 atrack,xtrack cloudclearingnoiseamplificationfactor unitless
ir_x float32 atrack,xtrack RMS(rad(IR.ret)-radobs())forAMSUchannels unitless
bt2 float32 atrack,xtrack RMS(T(p)f/IR.ret-T(p)f/AMSU.ret) unitless
qualsurf float32 atrack,xtrack qualsurf
qualtemp float32 atrack,xtrack qualtemp
softcode float32 atrack,xtrack softwarerejectioncode
aeff_1 float32 atrack,xtrack A_eff(1stetastep) unitless
aeff_end float32 atrack,xtrack A_eff(lastetastep) unitless
a0_cloud float32 atrack,xtrack interceptofalpha(1)=f(alpha(2))fitting unitless
totliqwat float32 atrack,xtrack totalliquidwater(MW) unitless
fg_air_temp float32atrack,xtrack,air_pres
airtemperatureprofilefromtheMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess)firstguess
Kelvin
fg_h2o_vap_mol_lay float32atrack,xtrack,air_pres_lay
watervaporlayertotalsfromtheMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess)firstguess
molecules/m2
fg_surf_air_temp float32 atrack,xtracknear-surfaceairtemperature(~2metersabovesurface)fromtheMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess)firstguess
Kelvin
fg_surf_temp float32 atrack,xtrackradiativetemperatureofthesurfacefromtheMERRA2(seeSection3.11,GFSwasaccidentallyusedasthefirstguess)firstguess
Kelvin
chi2_temp float32 atrack,xtrack Temperatureprofilechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_h2o float32 atrack,xtrack Watervaporchi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_o3 float32 atrack,xtrack Ozonechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_ch4 float32 atrack,xtrack Methanechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_co float32 atrack,xtrack Carbonmonoxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
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Name Type Dimensions Description Units AncillaryVariables
chi2_co2 float32 atrack,xtrack Carbondioxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_n2o float32 atrack,xtrack Nitrousoxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_hno3 float32 atrack,xtrack Nitricacidchi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_so2 float32 atrack,xtrack Sulfurdioxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
ispare_2 ushort atrack,xtrack bitflagsforrejectionofretrievalsteps.Detailsarealgorithm-specific.
bad_phys_ret ubyte atrack,xtrack Flagforbadphysicalretrieval.
bad_mw_ret ubyte atrack,xtrack Flagforbadmicrowaveretrieval.
bad_reg_ret ubyte atrack,xtrack Flagforbadregressionretrieval.
pbest float32 atrack,xtrack MaximumvalueofpressureforwhichtemperatureisQuality=0 Pa
pgood float32 atrack,xtrack MaximumvalueofpressureforwhichtemperatureisQuality=0or1 Pa
nbest int16 atrack,xtracklevelindexofhighestpressure(i.e.lowestaltitude)forwhichQuality=0.Avalueof0indicatesthatnopartoftheprofilepassesthetest.
unitless
ngood int16 atrack,xtracklevelindexofhighestpressure(i.e.lowestaltitude)forwhichQuality=0or1.Avalueof0indicatesthatnopartoftheprofilepassesthetest.
unitless
mol_layVariables
Name Type Dimensions Description Units AncillaryVariables
h2o_vap_mol_lay float32 atrack,xtrack,air_pres_lay Watervaporlayertotalon100layers molecules/
m2 err,qc
o3_mol_lay float32 atrack,xtrack,air_pres_lay Ozonelayertotalon100layers molecules/
m2 err,qc
co_mol_lay float32 atrack,xtrack,air_pres_lay
Carbonmonoxidelayertotalon100layers
molecules/m2 err,qc
ch4_mol_lay float32 atrack,xtrack,air_pres_lay Methanelayertotalon100layers molecules/
m2 err,qc
co2_mol_lay float32 atrack,xtrack,air_pres_lay
carbondioxidelayertotalon100layers
molecules/m2 err,qc
n2o_mol_lay float32 atrack,xtrack,air_pres_lay nitrousoxidelayertotalon100layers molecules/
m2 err,qc
hno3_mol_lay float32 atrack,xtrack,air_pres_lay nitricacidlayertotalon100layers molecules/
m2 err,qc
so2_mol_lay float32 atrack,xtrack,air_pres_lay
sulfurdioxidelayertotalon100layers
molecules/m2 err,qc
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mwVariables
Name Type Dimensions Description Units AncillaryVariables
mw_air_temp float32 atrack,xtrack,air_pres airtemperatureprofilefromtheMW-onlystep Kelvin err,qc
mw_surf_air_temp float32 atrack,xtrack Near-surfaceairtemperature(~2metersabovesurface)fromtheMW-onlystep Kelvin err,qc
mw_surf_temp float32 atrack,xtrack RadiativetemperatureofthesurfacefromtheMW-onlystep Kelvin err,qc
mw_h2o_vap_tot float32 atrack,xtrack TotalprecipitablewatervaporfromtheMW-onlystep kg/m2 err,qc
mw_h2o_vap_mol_lay float32 atrack,xtrack,air_pres_lay WatervaporlayertotalfromtheMW-onlystep molecules
/m2 err,qc
mw_spec_hum float32 atrack,xtrack,air_pres_h2o
massfractionofwatervaporinmoistairfromtheMW-Onlystep unitless err,qc
mw_surf_spec_hum float32 atrack,xtrack Near-surfacemassfractionofwatervaporinmoistairfromtheMW-Onlystep unitless err,qc
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C.2CHARTRetrievalproduct
SNPPL2CHARTCRIMSSInterfaceSpecificationInterfaceSpecificationVersion02.00.28
04-10-2019
GlobalGroups
Path Description
/ Mainsciencedata
/mw MW-Onlydata
/mol_lay Layermoleculeamounts
/aux Internalproductteamdata
GlobalDimensions
Name Size Description
spatial 3 directions:x,y,zforsatellitepositionandvelocity
fov_poly 8 latitude/longitudepointsdefiningthepolygonboundinganFOV(anticlockwiseasviewedfromabove)
utc_tuple 8 partsofUTCtime:year,month,day,hour,minute,second,millisec,microsec
attitude 3 roll,pitch,yaw
fov 9 Field-of-viewdimension
atrack 45 along-trackhorizontaldimension
xtrack 30 cross-trackhorizontaldimension
air_pres 100 Fineatmosphericpressurelevelsstartingfromthetop
air_pres_h2o 66 Fineatmosphericpressurelevelsstartingfromthetop
air_pres_lay 100 Fineatmosphericpressurelayersstartingfromthetop
surf_wnum_ir 100 IRsurfaceemissivityhingepoints
surf_freq_mw 7 MWsurfaceemissivityhingepoints
olr_wnum 16 frequencybandsforspectrallydecomposedoutgoinglongwaveradiation
cld_lay 2 Measuredcloudlayers:top,bottom
bnds_1d 2 Boundariesfor1-dfieldslikeair_pres_lay:min,max
GlobalAttributes
Name Type Size Value Description
keywords string 1ATMOSPHERE>ATMOSPHERICTEMPERATURE>UPPER
Acomma-separatedlistofkeywordsand/orphrases.Keywordsmaybecommonwordsorphrases,termsfromacontrolledvocabulary
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Name Type Size Value Description
AIRTEMPERATURE\,ATMOSPHERE>ATMOSPHERICWATERVAPOR>WATERVAPOR
(GCMDisoftenused),orURIsfortermsfromacontrolledvocabulary(seealso"keywords_vocabulary"attribute).
Conventions string 1 CF-1.6\,ACDD-1.3 Acomma-separatedlistoftheconventionsthatarefollowedbythedataset.
history string 1
Providesanaudittrailformodificationstotheoriginaldata.ThisattributeisalsointheNetCDFUsersGuide:'Thisisacharacterarraywithalineforeachinvocationofaprogramthathasmodifiedthedataset.Well-behavedgenericnetCDFapplicationsshouldappendalinecontaining:date,timeofday,username,programnameandcommandarguments.'ToincludeamorecompletedescriptionyoucanappendareferencetoanISOLineageentity;seeNOAAEDMISOLineageguidance.
source string 1 CrISandATMSinstrumenttelemetry
Themethodofproductionoftheoriginaldata.Ifitwasmodel-generated,sourceshouldnamethemodelanditsversion.Ifitisobservational,sourceshouldcharacterizeit.ThisattributeisdefinedintheCFConventions.Examples:'temperaturefromCTD#1234';'worldmodelv.0.1'.
processing_level string 1 2 Atextualdescriptionoftheprocessing(orqualitycontrol)levelofthedata.
product_name_type_id string 1 L2_CHART_RET_NSR Productnameasitappearsinproduct_name(L1A,L1B,L2,SNO_AIRS_CrIS)
comment string 1 Miscellaneousinformationaboutthedataormethodsusedtoproduceit.Canbeempty.
acknowledgment string 1 SupportforthisresearchwasprovidedbyNASA.
Aplacetoacknowledgevarioustypesofsupportfortheprojectthatproducedthisdata.
license string 1 LimitedtoSounderSIPSaffiliates
ProvidetheURLtoastandardorspecificlicense,enter"FreelyDistributed"or"None",ordescribeanyrestrictionstodataaccessanddistributioninfreetext.
standard_name_vocabulary string 1 CFStandardNameTablev28
Thenameandversionofthecontrolledvocabularyfromwhichvariablestandardnamesaretaken.(Valuesforanystandard_nameattributemustcomefromtheCFStandardNamesvocabularyforthedatafileorproducttocomplywithCF.)Example:'CFStandardNameTablev27'.
date_created string 1 Unassigned
Thedateonwhichthisversionofthedatawascreated.(Modificationofvaluesimpliesanewversion,hencethiswouldbeassignedthedateofthemostrecentvaluesmodification.)Metadatachangesarenotconsideredwhenassigningthedate_created.TheISO8601:2004extendeddateformatisrecommended,asdescribedintheAttributeContentGuidancesection.
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Name Type Size Value Description
creator_name string 1 UnassignedThenameoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_email string 1 Unassigned
Theemailaddressoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_url string 1 UnassignedTheURLoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
institution string 1 Unassigned Processingfacilitythatproducedthisfile
project string 1 SounderSIPS
Thenameoftheproject(s)principallyresponsiblefororiginatingthisdata.Multipleprojectscanbeseparatedbycommas,asdescribedunderAttributeContentGuidelines.Examples:'PATMOS-X','ExtendedContinentalShelfProject'.
product_name_project string 1 SNDRThenameoftheprojectasitappearsinthefilename.'SNDR'forallSounderSIPSproducts,evenAIRSproducts.
publisher_name string 1 Unassigned
Thenameoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_email string 1 Unassigned
Theemailaddressoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_url string 1 Unassigned
TheURLoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
geospatial_bounds string 1
Describesthedata's2Dor3DgeospatialextentinOGC'sWell-KnownText(WKT)Geometryformat(referencetheOGCSimpleFeatureAccess(SFA)specification).Themeaningandorderofvaluesforeachpoint'scoordinatesdependsonthecoordinatereferencesystem(CRS).TheACDDdefaultis2DgeometryintheEPSG:4326coordinatereferencesystem.Thedefaultmaybeoverriddenwithgeospatial_bounds_crsandgeospatial_bounds_vertical_crs(seethoseattributes).EPSG:4326coordinatevaluesarelatitude(decimaldegrees_north)andlongitude(decimaldegrees_east),inthatorder.Longitudevaluesinthedefaultcasearelimitedtothe-180,180)range.Example:'POLYGON((40.26-111.29,41.26-111.29,41.26-110.29,40.26-110.29,40.26-111.29))'.
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Name Type Size Value Description
geospatial_bounds_crs string 1 EPSG:4326
Thecoordinatereferencesystem(CRS)ofthepointcoordinatesinthegeospatial_boundsattribute.ThisCRSmaybe2-dimensionalor3-dimensional,buttogetherwithgeospatial_bounds_vertical_crs,ifthatattributeissupplied,mustmatchthedimensionality,order,andmeaningofpointcoordinatevaluesinthegeospatial_boundsattribute.Ifgeospatial_bounds_vertical_crsisalsopresentthenthisattributemustonlyspecifya2DCRS.EPSGCRSsarestronglyrecommended.Ifthisattributeisnotspecified,theCRSisassumedtobeEPSG:4326.Examples:'EPSG:4979'(the3DWGS84CRS),'EPSG:4047'.
geospatial_lat_min float 1 9.9692099683868690e+36f
Describesasimplelowerlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_minspecifiesthesouthernmostlatitudecoveredbythedataset.
geospatial_lat_max float 1 9.9692099683868690e+36f
Describesasimpleupperlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_maxspecifiesthenorthernmostlatitudecoveredbythedataset.
geospatial_lon_min float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_minspecifiesthewesternmostlongitudecoveredbythedataset.Seealsogeospatial_lon_max.
geospatial_lon_max float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_maxspecifiestheeasternmostlongitudecoveredbythedataset.Caseswheregeospatial_lon_minisgreaterthangeospatial_lon_maxindicatetheboundingboxextendsfromgeospatial_lon_max,throughthelongituderangediscontinuitymeridian(eithertheantimeridianfor-180:180values,orPrimeMeridianfor0:360values),togeospatial_lon_min;forexample,geospatial_lon_min=170andgeospatial_lon_max=-175incorporates15degreesoflongitude(ranges170to180and-180to-175).
time_coverage_start string 1
Nominalstarttime.Describesthetimeofthefirstdatapointinthedataset.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_first_valid_obs string 1 Describesthetimeofthefirstvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
time_coverage_mid string 1
Describesthemidpointbetweenthenominalstartandendtimes.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
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Name Type Size Value Description
time_coverage_end string 1
Nominalendtime.Describesthetimeofthelastdatapointinthedataset.UseISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_last_valid_obs string 1 Describesthetimeofthelastvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
time_coverage_duration string 1 P0000-00-00T00:06:00
Describesthedurationofthedataset.UseISO8601:2004durationformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
product_name_duration string 1 m06 Productdurationasitappearsinproduct_name(m06meanssixminutes)
creator_type string 1 institution
Specifiestypeofcreatorwithoneofthefollowing:'person','group','institution',or'position'.Ifthisattributeisnotspecified,thecreatorisassumedtobeaperson.
creator_institution string 1JetPropulsionLaboratory--CaliforniaInstituteofTechnology
Theinstitutionofthecreator;shoulduniquelyidentifythecreator'sinstitution.Thisattribute'svalueshouldbespecifiedevenifitmatchesthevalueofpublisher_institution,orifcreator_typeisinstitution.
product_version string 1 v01.00.00
Versionidentifierofthedatafileorproductasassignedbythedatacreator.Forexample,anewalgorithmormethodologycouldresultinanewproduct_version.
keywords_vocabulary string 1 GCMD:GCMDKeywords
Ifyouareusingacontrolledvocabularyforthewords/phrasesinyour"keywords"attribute,thisistheuniquenameoridentifierofthevocabularyfromwhichkeywordsaretaken.Ifmorethanonekeywordvocabularyisused,eachmaybepresentedwithaprefixandafollowingcomma,sothatkeywordsmayoptionallybeprefixedwiththecontrolledvocabularykey.Example:'GCMD:GCMDKeywords,CF:NetCDFCOARDSClimateandForecastStandardNames'.
platform string 1SUOMI-NPP>SuomiNationalPolar-orbitingPartnership
Nameoftheplatform(s)thatsupportedthesensordatausedtocreatethisdatasetorproduct.Platformscanbeofanytype,includingsatellite,ship,station,aircraftorother.Indicatecontrolledvocabularyusedinplatform_vocabulary.
platform_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"platform"attribute.
product_name_platform string 1 SNPP Platformnameasitappearsinproduct_name
instrument string 1
CRIMSS>Cross-trackInfraredandAdvancedTechnologyMicrowaveSounders\,CrIS>Cross-trackInfraredSounder\,
Nameofthecontributinginstrument(s)orsensor(s)usedtocreatethisdatasetorproduct.Indicatecontrolledvocabularyusedininstrument_vocabulary.
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Name Type Size Value Description
ATMS>AdvancedTechnologyMicrowaveSounder
instrument_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"instrument"attribute.
product_name_instr string 1 CRIMSS Instrumentnameasitappearsinproduct_name
product_name string 1 Canonicalfullyqualifiedproductname(officialfilename)
product_name_variant string 1 std
Processingvariantidentifierasitappearsinproduct_name.'std'(shorthandfor'standard')istobethedefaultandshouldbewhatisseeninallpublicproducts.
product_name_version string 1 vxx_xx_xx Versionnumberasitappearsinproduct_name(v01_00_00)
product_name_producer string 1 TProductionfacilityasitappearsinproduct_name(singlecharacter)'T'isthedefault,forunofficiallocaltestproducts
product_name_timestamp string 1 yymmddhhmmss Processingtimestampasitappearsinproduct_name(yymmddhhmmss)
product_name_extension string 1 nc Fileextensionasitappearsinproduct_name(typicallync)
granule_number ushort 1 granulenumberofday(1-240)
product_name_granule_number string 1 g000 zero-paddedstringforgranulenumberofday(g001-g240)
gran_id string 1 yyyymmddThhmmUniquegranuleidentifieryyyymmddThhmmofgranulestart,includingyear,month,day,hour,andminuteofgranulestarttime
geospatial_lat_mid float 1 9.9692099683868690e+36f granulecenterlatitude
geospatial_lon_mid float 1 9.9692099683868690e+36f granulecenterlongitude
featureType string 1 point structureofdatainfile
data_structure string 1 swath
acharacterstringindicatingtheinternalorganizationofthedatawithcurrentlyallowedvaluesof'grid','station','trajectory',or'swath'.The'structure'heregenerallydescribesthehorizontalstructureandinallcasesdatamayalsobefunctions,forexample,ofaverticalcoordinateand/ortime.(IfusingCMORpassthisinacalltocmor_set_cur_dataset_attribute.)
cdm_data_type string 1 Swath
Thedatatype,asderivedfromUnidata'sCommonDataModelScientificDatatypesandunderstoodbyTHREDDS.(ThisisaTHREDDS"dataType",andisdifferentfromtheCFNetCDFattribute'featureType',which
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Name Type Size Value Description
indicatesaDiscreteSamplingGeometryfileinCF.)
id string 1 Unassigned
Anidentifierforthedataset,providedbyanduniquewithinitsnamingauthority.Thecombinationofthe"namingauthority"andthe"id"shouldbegloballyunique,buttheidcanbegloballyuniquebyitselfalso.IDscanbeURLs,URNs,DOIs,meaningfultextstrings,alocalkey,oranyotheruniquestringofcharacters.Theidshouldnotincludewhitespacecharacters.
naming_authority string 1 Unassigned
Theorganizationthatprovidestheinitialid(seeabove)forthedataset.Thenamingauthorityshouldbeuniquelyspecifiedbythisattribute.Werecommendusingreverse-DNSnamingforthenamingauthority;URIsarealsoacceptable.Example:'edu.ucar.unidata'.
identifier_product_doi string 1 Unassigned digitalsignature
identifier_product_doi_authority string 1 Unassigned digitalsignaturesource
algorithm_version string 1
Theversionofthealgorithminwhateverformatisselectedbythedevelopers.Afterthemainalgorithmnameandversion,versionsfrommultiplesub-algorithmsmaybeconcatenatedwithsemicolonseparators.(ex:'CCAST4.2;BBemisfromMIT2016-04-01')Mustbeupdatedwitheverydeliverythatchangesnumericalresults.
production_host string 1 Identifyinginformationaboutthehostcomputerforthisrun.(Outputoflinux"uname-a"command.)
format_version string 1 v02.00.29 Formatversion.
input_file_names string 1 Semicolon-separatedlistofnamesoruniqueidentifiersoffilesthatwereusedtomakethisproduct.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_types string 1 Semicolon-separatedlistoftagsgivingtheroleofeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_dates string 1 Semicolon-separatedlistofcreationdatesforeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
orbitDirection string 1
Orbitisascendingand/ordescending.Valuesare"Ascending"or"Descending"iftheentiregranulefitsthatdescription."NorthPole"and"SouthPole"areusedforpolar-crossinggranules."NA"isusedwhenadeterminationcannotbemade.
day_night_flag string 1 Dataisdayornight."Day"meanssubsatellitepointforallvalidscanshassolarzenithangle
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Name Type Size Value Description
lessthan90degrees."Night"meanssubsatellitepointforallvalidscanshassolarzenithanglegreaterthan90degrees."Both"meansthedatasetcontainsvalidobservationswithsolarzenithangleaboveandbelow90degrees."NA"meansavaluecouldnotbedetermined.
AutomaticQualityFlag string 1 Missing
"Passed":thegranulecontainsanon-degradedcalibratedbrightnesstemperature,radiance,orretrievedvalueforatleastonevalueinageolocatedFOV;"Suspect":thegranuledoesnotqualifyas"Passed"butcontainsa(possiblydegraded)calibratedorretrievedvalue(possiblywithoutassociatedgeolocation);"Failed":thegranulecontainsnocalibratedorretrievedvalues.
qa_pct_data_missing float 1 Percentageofexpectedobservationsthataremissing.
qa_pct_data_geo float 1 Percentageofexpectedobservationsthataresuccessfullygeolocated.
qa_pct_data_sci_mode float 1 Percentageofexpectedobservationsthatweretakenwhiletheinstrumentwasinsciencemodeandaresuccessfullygeolocated.
qa_no_data string 1 TRUEAsimpleindicatorofwhetherthisisan"empty"granulewithnodatafromtheinstrument."TRUE"or"FALSE".
title string 1 Level-2CHARTSNPPCrIMSS
asuccinctdescriptionofwhatisinthedataset.(=ECSlongname)
summary string 1
TheLevel-2CHARTproductincludesatmosphericstateretrievalproductsfromtheCHARTalgorithmforonesix-minuteinterval.Theseincludetemperatureandwatervaporprofilesaswellascloudandsurfaceproductsandminorgases.
Aparagraphdescribingthedataset,analogoustoanabstractforapaper.
shortname string 1 SNDRSNIML2CHTRETN ECSShortName
product_group string 1 l2_crimssThegroupnametobeusedforthisproductwhenitiscollectedinamulti-groupfiletype,likeSNOorcalsub.
metadata_link string 1 UnassignedAURLthatgivesthelocationofmorecompletemetadata.ApersistentURLisrecommendedforthisattribute.
references string 1 ATDBanddesigndocumentsdescribingprocessingalgorithms.Canbeempty.
contributor_name string 1
JoelSusskind\,NASAGSFC;WilliamJ.Blackwell\,MIT;L.LarrabeeStrow\,UMBC;PhilipW.Rosenkranz\,MIT
Thenamesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
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Name Type Size Value Description
contributor_role string 1RetrievalPI;NeuralNetworkPI;ForwardModelPI;MicrowavePI
Therolesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
GlobalVariables
Name Type Dimensions Description Units
AncillaryVariables
obs_id string atrack,xtrack
uniqueearthviewobservationidentifier:yyyymmddThhmm.aaExx.Includesgran_idplus2-digitalong-trackindex(01-45)and2-digitcross-trackindex(01-30).
fov_obs_id string atrack,xtrack,fov
uniqueearthviewobservationidentifierforFOV:yyyymmddThhmm.aaExx.f.Includesgran_idplus2-digitalong-trackindex(01-45),2-digitcross-trackindex(01-30),and1-digitFOVnumber(1-9).
obs_time_tai93 double
atrack,xtrack earthviewobservationmidtimeforeachFOV
secondssince1993-01-0100:00
bnds
obs_time_utc uint16
atrack,xtrack,utc_tuple
UTCearthviewobservationtimeasanarrayofintegers:year,month,day,hour,minute,second,millisec,microsec
lat float atrack,xtrack latitudeofFORcenter degrees_nor
th bnds
lat_geoid float atrack,xtrack
latitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_north
fov_lat float atrack,xtrack,fov latitudeofFOVcenter degrees_nor
th bnds
lon float atrack,xtrack longitudeofFORcenter degrees_eas
t bnds
lon_geoid float atrack,xtrack
longitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_east
fov_lon float atrack,xtrack,fov longitudeofFOVcenter degrees_eas
t bnds
land_frac float atrack,xtrack landfractionovertheFOR unitless
fov_land_frac float atrack,xtrack,fov landfractionovertheFOV unitless
surf_alt float atrack,xtrack meansurfacealtitudewrtearthmodelovertheFOR m
fov_surf_alt float atrack,xtrack,fov meansurfacealtitudewrtearthmodelovertheFOV m
surf_alt_sdev float atrack,xtrack standarddeviationofsurfacealtitudewithintheFOR m
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Name Type Dimensions Description Units
AncillaryVariables
fov_surf_alt_sdev float atrack,xtrack,fov standarddeviationofsurfacealtitudewithintheFOV m
sun_glint_lat float atrack sunglintspotlatitudeatscan_mid_time.Fillfornightobservations.
degrees_north
sun_glint_lon float atrack sunglintspotlongitudeatscan_mid_time.Fillfornightobservations.
degrees_east
sol_zen float atrack,xtrack solarzenithangleatthecenterofthespot degree
sol_azi float atrack,xtrack
solarazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sun_glint_dist float atrack,xtrack
distanceofsunglintspottothecenterofthespot.Fillfornightobservations. m
view_ang float atrack,xtrack offnadirpointingangle degree
sat_zen float atrack,xtrack satellitezenithangleatthecenterofthespot degree
sat_azi float atrack,xtrack
satelliteazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sat_range float atrack,xtrack
lineofsightdistancebetweensatelliteandspotcenter m
asc_flag ubyte atrack ascendingorbitflag:1ifascending,0descending
subsat_lat float atrack sub-satellitelatitudeatscan_mid_time degrees_north
subsat_lon float atrack sub-satellitelongitudeatscan_mid_time degrees_east
scan_mid_time double atrack TAI93atmiddleofearthscenescans
secondssince1993-01-0100:00
sat_alt float atrack satellitealtitudewithrespecttoearthmodelatscan_mid_time m
sat_pos float atrack,spatial satelliteECRpositionatscan_mid_time m
sat_vel float atrack,spatial satelliteECRvelocityatscan_mid_time ms-1
sat_att float atrack,attitude
satelliteattitudeatscan_mid_time.Anorthogonaltriad.Firstelementisangleaboutthe+x(roll)ORBaxis.+xaxisispositivelyorientedinthedirectionoforbitalflight.Secondelementisangleabout+y(pitch)ORBaxis.+yaxisisorientednormaltotheorbitplanewiththepositivesenseoppositetothatoftheorbit'sangularmomentumvectorH.Thirdelementisangleabout+z(yaw)axis.+zaxisis
degree
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Name Type Dimensions Description Units
AncillaryVariables
positivelyorientedEarthwardparalleltothesatelliteradiusvectorRfromthespacecraftcenterofmasstothecenteroftheEarth.
local_solar_time float atrack,xtrack localapparentsolartimeinhoursfrommidnight hours
mean_anom_wrt_equat float atrack spacecraftmeananomalymeasuredwithrespectto
theascendingnode degree
sat_sol_zen float atrack solarzenithangleatthesatellite degree
sat_sol_azi float atrack solarazimuthangleatthesatellite(clockwisefromNorth) degree
asc_node_lon float Longitudeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
degrees_east
asc_node_tai93 double
TAI93timeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
secondssince1993-01-0100:00
asc_node_local_solar_time float localapparentsolartimeatthelastascendingnode
beforetime_coverage_endinhoursfrommidnight hours
solar_beta_angle float Betaangleforthespacecraftorbit,determiningthepercentageoftheorbitthatthespacecraftisindirectsunlight.
degree
attitude_lbl string attitude listofrotationaldirections(roll,pitch,yaw)
spatial_lbl string spatial listofspatialdirections(X,Y,Z)
utc_tuple_lbl string utc_tuple
namesoftheelementsofUTCwhenitisexpressedasanarrayofintegersyear,month,day,hour,minute,second,millisecond,microsecond
air_temp float32
atrack,xtrack,air_pres
airtemperatureprofile Kelvin err,qc
surf_air_temp float32
atrack,xtrack
near-surfaceairtemperature(~2metersabovesurface) Kelvin err,qc
air_temp_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationabouttheairtemperatureprofileprovidedbythephysicalretrievalstep.
unitless
h2o_vap_tot float32
atrack,xtrack totalprecipitablewatervapor kg/m2 err,qc
spec_hum float32
atrack,xtrack,air_pres_h2o
massfractionofwatervaporinmoistair unitless err,qc
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Name Type Dimensions Description Units
AncillaryVariables
surf_spec_hum float32
atrack,xtrack
Near-surfacemassfractionofwatervaporinmoistair unitless err,qc
h2o_vap_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthewatervaporprofileprovidedbythephysicalretrievalstep.
unitless
rel_hum float32
atrack,xtrack,air_pres_h2o
relativehumidityoverequilibriumphase unitless err,qc
surf_rel_hum float32
atrack,xtrack
relativehumiditynearthesurfaceoverequilibriumphase unitless err,qc
spec_hum_sat_ice float32
atrack,xtrack,air_pres_h2o
saturationspecifichumidityinequilibriumwithice unitless err,qc
surf_spec_hum_sat_ice float32
atrack,xtrack
Near-surfacesaturationspecifichumidityinequilibriumwithice unitless err,qc
spec_hum_sat_liq float32
atrack,xtrack,air_pres_h2o
saturationspecifichumidityinequilibriumwithliquidwater unitless err,qc
surf_spec_hum_sat_liq float32
atrack,xtrack
Near-surfacesaturationspecifichumidityinequilibriumwithliquidwater unitless err,qc
gp_hgt float32
atrack,xtrack,air_pres
Geopotentialisthesumofthespecificgravitationalpotentialenergyrelativetothegeoidandthespecificcentripetalpotentialenergy.Geopotentialheightisthegeopotentialdividedbythestandardaccelerationduetogravity.
m err,qc
surf_gp_hgt float32
atrack,xtrack geopotentialheightatthesurface m err,qc
o3_tot float32
atrack,xtrack
Totalcolumnozone.(Multiplyby4.670e5toconverttoDobsonUnitsfromkgm^-2) kgm-2 err,qc
o3_mmr float32
atrack,xtrack,air_pres
ozonemassmixingratiotomoistair unitless err,qc
o3_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationabouttheozoneprofileprovidedbythephysicalretrievalstep.
unitless
co_mmr_midtrop float32
atrack,xtrack
Carbonmonoxidemassmixingratiotomoistairat50000Pa,nearthepeakofsensitivity unitless err,qc
co_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthecarbonmonoxideprofileprovidedbythephysicalretrievalstep.
unitless
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Name Type Dimensions Description Units
AncillaryVariables
ch4_mmr_midtrop float32
atrack,xtrack
Methanemassmixingratiotomoistairat40000Pa,nearthepeakofsensitivity unitless err,qc
ch4_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthemethaneprofileprovidedbythephysicalretrievalstep.
unitless
mw_cld_phase int16atrack,xtrack,air_pres_lay
CloudIce/Waterflagfrommicrowave.0forliquidcloudsornoclouds;1foriceclouds.
h2o_liq_tot float32
atrack,xtrack totalcolumncloudliquidwater kgm-2 err,qc
h2o_liq_mol_lay float32
atrack,xtrack,air_pres_lay
cloudliquidwaterlayertotal unitless err,qc
surf_temp float32
atrack,xtrack radiativetemperatureofthesurface Kelvin err,qc
surf_temp_dof float32
atrack,xtrack
Thetraceoftheaveragingkernelmatrixasameasureofthenumberofpiecesofinformationaboutthesurfaceskintemperatureprovidedbythephysicalretrievalstep.
unitless
surf_ir_emis float32
atrack,xtrack,surf_wnum_ir
infraredsurfaceemissivity unitless err,qc
surf_ir_refl float32
atrack,xtrack,surf_wnum_ir
infraredsurfacereflectivity unitless qc
surf_ir_wnum_cnt int16 atrack,xtrack Numberofinfraredsurfaceemissivityfrequencies unitless
surf_ir_wnum float32
atrack,xtrack,surf_wnum_ir
Surfaceinfraredemissivityfrequencies(hingepoints) cm-1
surf_mw_emis float32
atrack,xtrack,surf_freq_mw
Microwavesurfaceemissivity unitless err,qc
cld_frac float32
atrack,xtrack,fov,cld_lay
effectivecloudfraction unitless err,qc
cld_top_pres float32
atrack,xtrack,fov,cld_lay
cloudtoppressureinorderofincreasingpressure Pa err,qc
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Name Type Dimensions Description Units
AncillaryVariables
cld_top_temp float32
atrack,xtrack,fov,cld_lay
cloudtoptemperature Kelvin err,qc
num_cld byte atrack,xtrack,fov Numberofcloudlayerswithnonzerocloudfraction unitless
olr float32
atrack,xtrack,fov
outgoinglongwaveradiationfluxintegratedover2to2800cm-1 W/m2 err,qc
olr_band float32
atrack,xtrack,fov,olr_wnum
outgoinglongwaveradiationfluxperband W/m2 err,qc
olr_clr float32
atrack,xtrack
clear-skyoutgoinglongwaveradiationfluxintegratedover2to2800cm-1 W/m2 err,qc
olr_clr_band float32
atrack,xtrack,olr_wnum
clear-skyoutgoinglongwaveradiationfluxperband W/m2 err,qc
tpause_gp_hgt float32
atrack,xtrack
tropopausegeopotentialheight,wheretropopauseisdeterminedaccordingtotheWMOdefinition m qc
tpause_pres float32
atrack,xtrack
tropopausepressure,wheretropopauseisdeterminedaccordingtotheWMOdefinition Pa qc
tpause_temp float32
atrack,xtrack
tropopausetemperature,wheretropopauseisdeterminedaccordingtotheWMOdefinition Kelvin qc
ir_precip_est_24hr float32
atrack,xtrack,fov
Thethicknessofalayerofliquidwaterequivalenttotheestimtedpreciptitationover24hours. m err,qc
air_pres_nsurf int16 atrack,xtrack
Indexinair_presofthelevelatthesurface.Valuesatlevelsbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres_h2o_nsurf int16 atrack,xtrack
Indexinair_pres_h2oofthelevelatthesurface.Valuesatlevelsbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres_lay_nsurf int16 atrack,xtrack
Indexinair_pres_layofthelayeratthesurface.Valuesforlayersbeyondthisareinvalid,representingdatabelowtheEarth'ssurface.
unitless
air_pres float32 air_pres pressurelevels Pa
air_pres_h2o float32
air_pres_h2o H2Ovaporpressurelevels Pa
air_pres_lay float32 air_pres_lay pressureatthemiddleofeachlayer Pa bnds
cld_lay_lbl string cld_lay Cloudlayer{top,bottom}
olr_wnum float32 olr_wnum OLRfrequencybandcenters cm-1 bnds
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Name Type Dimensions Description Units
AncillaryVariables
mw_surf_class int16 atrack,xtrack
Microwavespectralsurfaceclass.0forcoastline;1forland;2forocean;3forfirst-yearsea-ice;4formulti-yearsea-ice;5forsnow(higher-freqscattering);6forglacier/snow(verylow-freqscattering);7forsnow(lower-freqscattering);
surf_freq_mw float32
surf_freq_mw
Microwavesurfaceemissivityfrequencies(hingepoints) Hz
auxVariables
Name Type Dimensions Description Units AncillaryVariables
for_cld_frac_tot float32 atrack,xtrack Field-Of-Regardeffectivecloudfractionsummedoverallcloudlayers unitless err,qc
for_cld_top_pres_tot float32 atrack,xtrack Field-Of-Regardweightedcloudtoppressure Pa err,qc
for_cld_frac_2lay float32atrack,xtrack,cld_lay
Effectivecloudfractionassuming2commoncloudlayersoverthewholeField-Of-Regard unitless err,qc
for_cld_top_pres_2lay float32atrack,xtrack,cld_lay
Cloudtoppressureassuming2commoncloudlayersoverthewholeField-of-Regard Pa err,qc
clim_o3_mol_lay float32atrack,xtrack,air_pres_lay
Ozonecolumndensityon100layersfromtheclimatologyfirstguess
molecules/m2
clim_surf_ir_emis float32atrack,xtrack,surf_wnum_ir
Infraredsurfaceemissivityfromtheclimatologyfirstguess unitless
clim_surf_ir_refl float32atrack,xtrack,surf_wnum_ir
infraredsurfacereflectivityfromtheclimatologyfirstguess unitless
clim_surf_ir_wnum_cnt int16 atrack,xtrack Numberofinfraredsurfaceemissivityfrequenciesfortheclimatologyfirstguess unitless
clim_surf_ir_wnum float32atrack,xtrack,surf_wnum_ir
Surfaceinfraredemissivityfrequencies(hingepoints)fortheclimatologyfirstguess cm-1
clim_co2_mmr float32 atrack,xtrack Assumedcarbondioxideconcentration unitless
prior_surf_pres float32 atrack,xtrack surfacepressurefromforecast Pa
prior_sea_lev_pres float32 atrack,xtrack sealevelsurfacepressurefromforecast Pa
idprof string atrack,xtrack profileID
etarej float32 atrack,xtrack cloudclearingresidualusedf/rejatiteration=ieta_rej unitless
cldfrc_tot float32 atrack,xtrack TotalcloudfractionoverFOR unitless
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Name Type Dimensions Description Units AncillaryVariables
cldfrc_500 float32 atrack,xtrack TotalcloudfractionoverFORbelow500hPa unitless
ampl_eta float32 atrack,xtrack cloudclearingnoiseamplificationfactor unitless
ir_x float32 atrack,xtrack RMS(rad(IR.ret)-radobs())forAMSUchannels unitless
bt2 float32 atrack,xtrack RMS(T(p)f/IR.ret-T(p)f/AMSU.ret) unitless
qualsurf float32 atrack,xtrack qualsurf
qualtemp float32 atrack,xtrack qualtemp
softcode float32 atrack,xtrack softwarerejectioncode
aeff_1 float32 atrack,xtrack A_eff(1stetastep) unitless
aeff_end float32 atrack,xtrack A_eff(lastetastep) unitless
a0_cloud float32 atrack,xtrack interceptofalpha(1)=f(alpha(2))fitting unitless
chi2_cloud float32 atrack,xtrack chi^2ofalpha(1)=f(alpha(2))fitting unitless
fzeta float32 atrack,xtrack fzeta_effect unitless
rzeta float32 atrack,xtrack rzeta_effect unitless
bias_ccdiff float32 atrack,xtrack BIAS(-Rccr)in800-900cm-1region unitless
lambda_max float32 atrack,xtrack lambda(2,iter_eta)=U^TS^TN^{-1}SU unitless
totliqwat float32 atrack,xtrack totalliquidwater(MW) unitless
etarejfinal float32 atrack,xtrack etarejfinal unitless
gtest_a float32 atrack,xtrack gtest_a unitless
tsurfnoaa float32 atrack,xtrack tsurfnoaa unitless
noaadifftest float32 atrack,xtrack noaadifftest unitless
mitdifftest float32 atrack,xtrack T(p)final-T(p)startup unitless
mitsurftest float32 atrack,xtrack abs(Tsurfret-Tsurfstartup) unitless
nn_air_temp float32atrack,xtrack,air_pres
airtemperatureprofilefromtheneuralnetfirstguess Kelvin
nn_h2o_vap_mol_lay float32atrack,xtrack,air_pres_lay
watervaporlayertotalsfromtheneuralnetfirstguess
molecules/m2
nn_surf_air_temp float32 atrack,xtrack near-surfaceairtemperature(~2metersabovesurface)fromtheneuralnetfirstguess Kelvin
nn_surf_temp float32 atrack,xtrack radiativetemperatureofthesurfacefromtheneuralnetfirstguess Kelvin
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Name Type Dimensions Description Units AncillaryVariables
nn_olr float32 atrack,xtrack
outgoinglongwaveradiationfluxintegratedover2to2800cm-1fromtheneuralnetfirstguess.Suspectbecausenocloudretrievalcontributed.
Watts/meter2
nn_clrolr float32 atrack,xtrackclear-skyoutgoinglongwaveradiationfluxintegratedover2to2800cm-1fromtheneuralnetfirstguess
Watts/meter2
ispare_2 ushort atrack,xtrack bitflagsforrejectionofretrievalsteps.Detailsarealgorithm-specific.
bad_phys_ret ubyte atrack,xtrack Flagforbadphysicalretrieval.
bad_mw_ret ubyte atrack,xtrack Flagforbadmicrowaveretrieval.
bad_sccnn_ret ubyte atrack,xtrack FlagforbadSCCNNneuralnetretrieval.
pbest float32 atrack,xtrack MaximumvalueofpressureforwhichtemperatureisQuality=0 Pa
pgood float32 atrack,xtrack MaximumvalueofpressureforwhichtemperatureisQuality=0or1 Pa
nbest int16 atrack,xtrack
levelindexofhighestpressure(i.e.lowestaltitude)forwhichQuality=0.Avalueof0indicatesthatnopartoftheprofilepassesthetest.
unitless
ngood int16 atrack,xtrack
levelindexofhighestpressure(i.e.lowestaltitude)forwhichQuality=0or1.Avalueof0indicatesthatnopartoftheprofilepassesthetest.
unitless
mol_layVariables
Name Type Dimensions Description Units AncillaryVariables
h2o_vap_mol_lay float32 atrack,xtrack,air_pres_lay Watervaporlayertotalon100layers molecules/
m2 err,qc
o3_mol_lay float32 atrack,xtrack,air_pres_lay Ozonelayertotalon100layers molecules/
m2 err,qc
co_mol_lay float32 atrack,xtrack,air_pres_lay
Carbonmonoxidelayertotalon100layers
molecules/m2 err,qc
ch4_mol_lay float32 atrack,xtrack,air_pres_lay Methanelayertotalon100layers molecules/
m2 err,qc
mwVariables
Name Type Dimensions Description Units AncillaryVariables
mw_air_temp float32 atrack,xtrack,air_pres airtemperatureprofilefromtheMW-onlystep Kelvin err,qc
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Name Type Dimensions Description Units AncillaryVariables
mw_surf_air_temp float32 atrack,xtrack Near-surfaceairtemperature(~2metersabovesurface)fromtheMW-onlystep Kelvin err,qc
mw_surf_temp float32 atrack,xtrack RadiativetemperatureofthesurfacefromtheMW-onlystep Kelvin err,qc
mw_h2o_vap_tot float32 atrack,xtrack TotalprecipitablewatervaporfromtheMW-onlystep kg/m2 err,qc
mw_h2o_vap_mol_lay float32 atrack,xtrack,air_pres_lay WatervaporlayertotalfromtheMW-onlystep molecules
/m2 err,qc
mw_spec_hum float32 atrack,xtrack,air_pres_h2o
massfractionofwatervaporinmoistairfromtheMW-Onlystep unitless err,qc
mw_surf_spec_hum float32 atrack,xtrack Near-surfacemassfractionofwatervaporinmoistairfromtheMW-Onlystep unitless err,qc
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C.3CLIMCAPSCloud-ClearedRadianceproduct
SNPPL2CLIMCAPSCRIMSSCCNSRInterfaceSpecificationInterfaceSpecificationVersion02.00.28
04-10-2019
GlobalGroups
Path Description
/ Mainsciencedata
/aux_l2 InternalproductteamdatafromL2
GlobalDimensions
Name Size Description
spatial 3 directions:x,y,zforsatellitepositionandvelocity
fov_poly 8 latitude/longitudepointsdefiningthepolygonboundinganFOV(anticlockwiseasviewedfromabove)
utc_tuple 8 partsofUTCtime:year,month,day,hour,minute,second,millisec,microsec
attitude 3 roll,pitch,yaw
atrack 45 along-trackhorizontaldimension
xtrack 30 cross-trackhorizontaldimension
fov 9 Field-of-viewdimension
wnum_lw 717 longwaveIRchannelnumber
wnum_mw 437 midwaveIRchannelnumber
wnum_sw 163 shortwaveIRchannelnumber
GlobalAttributes
Name Type Size Value Description
keywords string 1
EARTHSCIENCE>SPECTRAL/ENGINEERING>INFRAREDWAVELENGTHS>INFRAREDRADIANCE
Acomma-separatedlistofkeywordsand/orphrases.Keywordsmaybecommonwordsorphrases,termsfromacontrolledvocabulary(GCMDisoftenused),orURIsfortermsfromacontrolledvocabulary(seealso"keywords_vocabulary"attribute).
Conventions string 1 CF-1.6\,ACDD-1.3 Acomma-separatedlistoftheconventionsthatarefollowedbythedataset.
history string 1 Providesanaudittrailformodificationstotheoriginaldata.Thisattributeisalsointhe
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Name Type Size Value Description
NetCDFUsersGuide:'Thisisacharacterarraywithalineforeachinvocationofaprogramthathasmodifiedthedataset.Well-behavedgenericnetCDFapplicationsshouldappendalinecontaining:date,timeofday,username,programnameandcommandarguments.'ToincludeamorecompletedescriptionyoucanappendareferencetoanISOLineageentity;seeNOAAEDMISOLineageguidance.
source string 1 CrISandATMSinstrumenttelemetry
Themethodofproductionoftheoriginaldata.Ifitwasmodel-generated,sourceshouldnamethemodelanditsversion.Ifitisobservational,sourceshouldcharacterizeit.ThisattributeisdefinedintheCFConventions.Examples:'temperaturefromCTD#1234';'worldmodelv.0.1'.
processing_level string 1 2 Atextualdescriptionoftheprocessing(orqualitycontrol)levelofthedata.
product_name_type_id string 1 L2_CLIMCAPS_CCR_NSR Productnameasitappearsinproduct_name(L1A,L1B,L2,SNO_AIRS_CrIS)
comment string 1 Miscellaneousinformationaboutthedataormethodsusedtoproduceit.Canbeempty.
acknowledgment string 1 SupportforthisresearchwasprovidedbyNASA.
Aplacetoacknowledgevarioustypesofsupportfortheprojectthatproducedthisdata.
license string 1 LimitedtoSounderSIPSaffiliates
ProvidetheURLtoastandardorspecificlicense,enter"FreelyDistributed"or"None",ordescribeanyrestrictionstodataaccessanddistributioninfreetext.
standard_name_vocabulary string 1 CFStandardNameTablev28
Thenameandversionofthecontrolledvocabularyfromwhichvariablestandardnamesaretaken.(Valuesforanystandard_nameattributemustcomefromtheCFStandardNamesvocabularyforthedatafileorproducttocomplywithCF.)Example:'CFStandardNameTablev27'.
date_created string 1 Unassigned
Thedateonwhichthisversionofthedatawascreated.(Modificationofvaluesimpliesanewversion,hencethiswouldbeassignedthedateofthemostrecentvaluesmodification.)Metadatachangesarenotconsideredwhenassigningthedate_created.TheISO8601:2004extendeddateformatisrecommended,asdescribedintheAttributeContentGuidancesection.
creator_name string 1 UnassignedThenameoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_email string 1 Unassigned
Theemailaddressoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
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Name Type Size Value Description
creator_url string 1 UnassignedTheURLoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
institution string 1 Unassigned Processingfacilitythatproducedthisfile
project string 1 SounderSIPS
Thenameoftheproject(s)principallyresponsiblefororiginatingthisdata.Multipleprojectscanbeseparatedbycommas,asdescribedunderAttributeContentGuidelines.Examples:'PATMOS-X','ExtendedContinentalShelfProject'.
product_name_project string 1 SNDRThenameoftheprojectasitappearsinthefilename.'SNDR'forallSounderSIPSproducts,evenAIRSproducts.
publisher_name string 1 Unassigned
Thenameoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_email string 1 Unassigned
Theemailaddressoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_url string 1 Unassigned
TheURLoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
geospatial_bounds string 1
Describesthedata's2Dor3DgeospatialextentinOGC'sWell-KnownText(WKT)Geometryformat(referencetheOGCSimpleFeatureAccess(SFA)specification).Themeaningandorderofvaluesforeachpoint'scoordinatesdependsonthecoordinatereferencesystem(CRS).TheACDDdefaultis2DgeometryintheEPSG:4326coordinatereferencesystem.Thedefaultmaybeoverriddenwithgeospatial_bounds_crsandgeospatial_bounds_vertical_crs(seethoseattributes).EPSG:4326coordinatevaluesarelatitude(decimaldegrees_north)andlongitude(decimaldegrees_east),inthatorder.Longitudevaluesinthedefaultcasearelimitedtothe-180,180)range.Example:'POLYGON((40.26-111.29,41.26-111.29,41.26-110.29,40.26-110.29,40.26-111.29))'.
geospatial_bounds_crs string 1 EPSG:4326
Thecoordinatereferencesystem(CRS)ofthepointcoordinatesinthegeospatial_boundsattribute.ThisCRSmaybe2-dimensionalor3-dimensional,buttogetherwithgeospatial_bounds_vertical_crs,ifthatattributeissupplied,mustmatchthedimensionality,order,andmeaningofpointcoordinatevaluesinthegeospatial_boundsattribute.Ifgeospatial_bounds_vertical_crsisalsopresentthenthisattributemustonlyspecifya2DCRS.
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Name Type Size Value Description
EPSGCRSsarestronglyrecommended.Ifthisattributeisnotspecified,theCRSisassumedtobeEPSG:4326.Examples:'EPSG:4979'(the3DWGS84CRS),'EPSG:4047'.
geospatial_lat_min float 1 9.9692099683868690e+36f
Describesasimplelowerlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_minspecifiesthesouthernmostlatitudecoveredbythedataset.
geospatial_lat_max float 1 9.9692099683868690e+36f
Describesasimpleupperlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_maxspecifiesthenorthernmostlatitudecoveredbythedataset.
geospatial_lon_min float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_minspecifiesthewesternmostlongitudecoveredbythedataset.Seealsogeospatial_lon_max.
geospatial_lon_max float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_maxspecifiestheeasternmostlongitudecoveredbythedataset.Caseswheregeospatial_lon_minisgreaterthangeospatial_lon_maxindicatetheboundingboxextendsfromgeospatial_lon_max,throughthelongituderangediscontinuitymeridian(eithertheantimeridianfor-180:180values,orPrimeMeridianfor0:360values),togeospatial_lon_min;forexample,geospatial_lon_min=170andgeospatial_lon_max=-175incorporates15degreesoflongitude(ranges170to180and-180to-175).
time_coverage_start string 1
Nominalstarttime.Describesthetimeofthefirstdatapointinthedataset.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_first_valid_obs string 1 Describesthetimeofthefirstvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
time_coverage_mid string 1
Describesthemidpointbetweenthenominalstartandendtimes.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_coverage_end string 1
Nominalendtime.Describesthetimeofthelastdatapointinthedataset.UseISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_last_valid_obs string 1 Describesthetimeofthelastvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
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Name Type Size Value Description
time_coverage_duration string 1 P0000-00-00T00:06:00
Describesthedurationofthedataset.UseISO8601:2004durationformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
product_name_duration string 1 m06 Productdurationasitappearsinproduct_name(m06meanssixminutes)
creator_type string 1 institution
Specifiestypeofcreatorwithoneofthefollowing:'person','group','institution',or'position'.Ifthisattributeisnotspecified,thecreatorisassumedtobeaperson.
creator_institution string 1JetPropulsionLaboratory--CaliforniaInstituteofTechnology
Theinstitutionofthecreator;shoulduniquelyidentifythecreator'sinstitution.Thisattribute'svalueshouldbespecifiedevenifitmatchesthevalueofpublisher_institution,orifcreator_typeisinstitution.
product_version string 1 v01.00.00
Versionidentifierofthedatafileorproductasassignedbythedatacreator.Forexample,anewalgorithmormethodologycouldresultinanewproduct_version.
keywords_vocabulary string 1 GCMD:GCMDKeywords
Ifyouareusingacontrolledvocabularyforthewords/phrasesinyour"keywords"attribute,thisistheuniquenameoridentifierofthevocabularyfromwhichkeywordsaretaken.Ifmorethanonekeywordvocabularyisused,eachmaybepresentedwithaprefixandafollowingcomma,sothatkeywordsmayoptionallybeprefixedwiththecontrolledvocabularykey.Example:'GCMD:GCMDKeywords,CF:NetCDFCOARDSClimateandForecastStandardNames'.
platform string 1SUOMI-NPP>SuomiNationalPolar-orbitingPartnership
Nameoftheplatform(s)thatsupportedthesensordatausedtocreatethisdatasetorproduct.Platformscanbeofanytype,includingsatellite,ship,station,aircraftorother.Indicatecontrolledvocabularyusedinplatform_vocabulary.
platform_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"platform"attribute.
product_name_platform string 1 SNPP Platformnameasitappearsinproduct_name
instrument string 1
CRIMSS>Cross-trackInfraredandAdvancedTechnologyMicrowaveSounders\,CrIS>Cross-trackInfraredSounder\,ATMS>AdvancedTechnologyMicrowaveSounder
Nameofthecontributinginstrument(s)orsensor(s)usedtocreatethisdatasetorproduct.Indicatecontrolledvocabularyusedininstrument_vocabulary.
instrument_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"instrument"attribute.
product_name_instr string 1 CRIMSS Instrumentnameasitappearsinproduct_name
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Name Type Size Value Description
product_name string 1 Canonicalfullyqualifiedproductname(officialfilename)
product_name_variant string 1 std
Processingvariantidentifierasitappearsinproduct_name.'std'(shorthandfor'standard')istobethedefaultandshouldbewhatisseeninallpublicproducts.
product_name_version string 1 vxx_xx_xx Versionnumberasitappearsinproduct_name(v01_00_00)
product_name_producer string 1 TProductionfacilityasitappearsinproduct_name(singlecharacter)'T'isthedefault,forunofficiallocaltestproducts
product_name_timestamp string 1 yymmddhhmmss Processingtimestampasitappearsinproduct_name(yymmddhhmmss)
product_name_extension string 1 nc Fileextensionasitappearsinproduct_name(typicallync)
granule_number ushort 1 granulenumberofday(1-240)
product_name_granule_number string 1 g000 zero-paddedstringforgranulenumberofday(g001-g240)
gran_id string 1 yyyymmddThhmmUniquegranuleidentifieryyyymmddThhmmofgranulestart,includingyear,month,day,hour,andminuteofgranulestarttime
geospatial_lat_mid float 1 9.9692099683868690e+36f granulecenterlatitude
geospatial_lon_mid float 1 9.9692099683868690e+36f granulecenterlongitude
featureType string 1 point structureofdatainfile
data_structure string 1 swath
acharacterstringindicatingtheinternalorganizationofthedatawithcurrentlyallowedvaluesof'grid','station','trajectory',or'swath'.The'structure'heregenerallydescribesthehorizontalstructureandinallcasesdatamayalsobefunctions,forexample,ofaverticalcoordinateand/ortime.(IfusingCMORpassthisinacalltocmor_set_cur_dataset_attribute.)
cdm_data_type string 1 Swath
Thedatatype,asderivedfromUnidata'sCommonDataModelScientificDatatypesandunderstoodbyTHREDDS.(ThisisaTHREDDS"dataType",andisdifferentfromtheCFNetCDFattribute'featureType',whichindicatesaDiscreteSamplingGeometryfileinCF.)
id string 1 Unassigned
Anidentifierforthedataset,providedbyanduniquewithinitsnamingauthority.Thecombinationofthe"namingauthority"andthe"id"shouldbegloballyunique,buttheidcanbegloballyuniquebyitselfalso.IDscanbeURLs,URNs,DOIs,meaningfultextstrings,alocalkey,oranyotheruniquestringof
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Name Type Size Value Description
characters.Theidshouldnotincludewhitespacecharacters.
naming_authority string 1 Unassigned
Theorganizationthatprovidestheinitialid(seeabove)forthedataset.Thenamingauthorityshouldbeuniquelyspecifiedbythisattribute.Werecommendusingreverse-DNSnamingforthenamingauthority;URIsarealsoacceptable.Example:'edu.ucar.unidata'.
identifier_product_doi string 1 Unassigned digitalsignature
identifier_product_doi_authority string 1 Unassigned digitalsignaturesource
algorithm_version string 1
Theversionofthealgorithminwhateverformatisselectedbythedevelopers.Afterthemainalgorithmnameandversion,versionsfrommultiplesub-algorithmsmaybeconcatenatedwithsemicolonseparators.(ex:'CCAST4.2;BBemisfromMIT2016-04-01')Mustbeupdatedwitheverydeliverythatchangesnumericalresults.
production_host string 1 Identifyinginformationaboutthehostcomputerforthisrun.(Outputoflinux"uname-a"command.)
format_version string 1 v02.00.29 Formatversion.
input_file_names string 1 Semicolon-separatedlistofnamesoruniqueidentifiersoffilesthatwereusedtomakethisproduct.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_types string 1 Semicolon-separatedlistoftagsgivingtheroleofeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_dates string 1 Semicolon-separatedlistofcreationdatesforeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
orbitDirection string 1
Orbitisascendingand/ordescending.Valuesare"Ascending"or"Descending"iftheentiregranulefitsthatdescription."NorthPole"and"SouthPole"areusedforpolar-crossinggranules."NA"isusedwhenadeterminationcannotbemade.
day_night_flag string 1
Dataisdayornight."Day"meanssubsatellitepointforallvalidscanshassolarzenithanglelessthan90degrees."Night"meanssubsatellitepointforallvalidscanshassolarzenithanglegreaterthan90degrees."Both"meansthedatasetcontainsvalidobservationswithsolarzenithangleaboveandbelow90degrees."NA"meansavaluecouldnotbedetermined.
AutomaticQualityFlag string 1 Missing "Passed":thegranulecontainsanon-degradedcalibratedbrightnesstemperature,radiance,
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Name Type Size Value Description
orretrievedvalueforatleastonevalueinageolocatedFOV;"Suspect":thegranuledoesnotqualifyas"Passed"butcontainsa(possiblydegraded)calibratedorretrievedvalue(possiblywithoutassociatedgeolocation);"Failed":thegranulecontainsnocalibratedorretrievedvalues.
qa_pct_data_missing float 1 Percentageofexpectedobservationsthataremissing.
qa_pct_data_geo float 1 Percentageofexpectedobservationsthataresuccessfullygeolocated.
qa_pct_data_sci_mode float 1 Percentageofexpectedobservationsthatweretakenwhiletheinstrumentwasinsciencemodeandaresuccessfullygeolocated.
qa_no_data string 1 TRUEAsimpleindicatorofwhetherthisisan"empty"granulewithnodatafromtheinstrument."TRUE"or"FALSE".
title string 1 Level-2CLIMCAPSSNPPCrIMSSClearRadiances
asuccinctdescriptionofwhatisinthedataset.(=ECSlongname)
summary string 1
TheLevel-2CLIMCAPScloud-clearedproductincludesinfraredradiancesadjustedtosimulateclear-skyconditions.
Aparagraphdescribingthedataset,analogoustoanabstractforapaper.
shortname string 1 SNDRSNIML2CCPCCRN ECSShortName
product_group string 1 l2_crimss_ccThegroupnametobeusedforthisproductwhenitiscollectedinamulti-groupfiletype,likeSNOorcalsub.
metadata_link string 1 UnassignedAURLthatgivesthelocationofmorecompletemetadata.ApersistentURLisrecommendedforthisattribute.
references string 1 ATDBanddesigndocumentsdescribingprocessingalgorithms.Canbeempty.
contributor_name string 1
ChristopherD.Barnet\,STC;L.LarrabeeStrow\,UMBC;PhilipW.Rosenkranz\,MIT
Thenamesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
contributor_role string 1 RetrievalPI;ForwardModelPI;MicrowavePI
Therolesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
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GlobalVariables
Name Type Dimensions Description Units
AncillaryVariables
obs_id string atrack,xtrack
uniqueearthviewobservationidentifier:yyyymmddThhmm.aaExx.Includesgran_idplus2-digitalong-trackindex(01-45)and2-digitcross-trackindex(01-30).
fov_obs_id string atrack,xtrack,fov
uniqueearthviewobservationidentifierforFOV:yyyymmddThhmm.aaExx.f.Includesgran_idplus2-digitalong-trackindex(01-45),2-digitcross-trackindex(01-30),and1-digitFOVnumber(1-9).
obs_time_tai93 double
atrack,xtrack earthviewobservationmidtimeforeachFOV
secondssince1993-01-0100:00
bnds
obs_time_utc uint16
atrack,xtrack,utc_tuple
UTCearthviewobservationtimeasanarrayofintegers:year,month,day,hour,minute,second,millisec,microsec
lat float atrack,xtrack latitudeofFORcenter degrees_nor
th bnds
lat_geoid float atrack,xtrack
latitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_north
fov_lat float atrack,xtrack,fov latitudeofFOVcenter degrees_nor
th bnds
lon float atrack,xtrack longitudeofFORcenter degrees_eas
t bnds
lon_geoid float atrack,xtrack
longitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_east
fov_lon float atrack,xtrack,fov longitudeofFOVcenter degrees_eas
t bnds
land_frac float atrack,xtrack landfractionovertheFOR unitless
fov_land_frac float atrack,xtrack,fov landfractionovertheFOV unitless
surf_alt float atrack,xtrack meansurfacealtitudewrtearthmodelovertheFOR m
fov_surf_alt float atrack,xtrack,fov meansurfacealtitudewrtearthmodelovertheFOV m
surf_alt_sdev float atrack,xtrack standarddeviationofsurfacealtitudewithintheFOR m
fov_surf_alt_sdev float atrack,xtrack,fov standarddeviationofsurfacealtitudewithintheFOV m
sun_glint_lat float atrack sunglintspotlatitudeatscan_mid_time.Fillfornightobservations.
degrees_north
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Name Type Dimensions Description Units
AncillaryVariables
sun_glint_lon float atrack sunglintspotlongitudeatscan_mid_time.Fillfornightobservations.
degrees_east
sol_zen float atrack,xtrack solarzenithangleatthecenterofthespot degree
sol_azi float atrack,xtrack
solarazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sun_glint_dist float atrack,xtrack
distanceofsunglintspottothecenterofthespot.Fillfornightobservations. m
view_ang float atrack,xtrack offnadirpointingangle degree
sat_zen float atrack,xtrack satellitezenithangleatthecenterofthespot degree
sat_azi float atrack,xtrack
satelliteazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sat_range float atrack,xtrack lineofsightdistancebetweensatelliteandspotcenter m
asc_flag ubyte atrack ascendingorbitflag:1ifascending,0descending
subsat_lat float atrack sub-satellitelatitudeatscan_mid_time degrees_north
subsat_lon float atrack sub-satellitelongitudeatscan_mid_time degrees_east
scan_mid_time double atrack TAI93atmiddleofearthscenescans
secondssince1993-01-0100:00
sat_alt float atrack satellitealtitudewithrespecttoearthmodelatscan_mid_time m
sat_pos float atrack,spatial satelliteECRpositionatscan_mid_time m
sat_vel float atrack,spatial satelliteECRvelocityatscan_mid_time ms-1
sat_att float atrack,attitude
satelliteattitudeatscan_mid_time.Anorthogonaltriad.Firstelementisangleaboutthe+x(roll)ORBaxis.+xaxisispositivelyorientedinthedirectionoforbitalflight.Secondelementisangleabout+y(pitch)ORBaxis.+yaxisisorientednormaltotheorbitplanewiththepositivesenseoppositetothatoftheorbit'sangularmomentumvectorH.Thirdelementisangleabout+z(yaw)axis.+zaxisispositivelyorientedEarthwardparalleltothesatelliteradiusvectorRfromthespacecraftcenterofmasstothecenteroftheEarth.
degree
local_solar_time float atrack,xtrack localapparentsolartimeinhoursfrommidnight hours
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Name Type Dimensions Description Units
AncillaryVariables
mean_anom_wrt_equat float atrack spacecraftmeananomalymeasuredwithrespectto
theascendingnode degree
sat_sol_zen float atrack solarzenithangleatthesatellite degree
sat_sol_azi float atrack solarazimuthangleatthesatellite(clockwisefromNorth) degree
asc_node_lon float Longitudeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
degrees_east
asc_node_tai93 double
TAI93timeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
secondssince1993-01-0100:00
asc_node_local_solar_time float localapparentsolartimeatthelastascendingnode
beforetime_coverage_endinhoursfrommidnight hours
solar_beta_angle float Betaangleforthespacecraftorbit,determiningthepercentageoftheorbitthatthespacecraftisindirectsunlight.
degree
attitude_lbl string attitude listofrotationaldirections(roll,pitch,yaw)
spatial_lbl string spatial listofspatialdirections(X,Y,Z)
utc_tuple_lbl string utc_tuple
namesoftheelementsofUTCwhenitisexpressedasanarrayofintegersyear,month,day,hour,minute,second,millisecond,microsecond
rad_lw float32
atrack,xtrack,wnum_lw
longwaveclearspectralradiance mW/(m2srcm-1) err,qc
rad_mw float32
atrack,xtrack,wnum_mw
midwaveclearspectralradiance mW/(m2srcm-1) err,qc
rad_sw float32
atrack,xtrack,wnum_sw
shortwaveclearspectralradiance mW/(m2srcm-1) err,qc
cal_qualflag int32 atrack,xtrack,fov per-observationL1Bproductquality
cal_lw_qualflag int32 atrack,xtrack,fov per-observationL1BLWproductquality
cal_mw_qualflag int32 atrack,xtrack,fov per-observationL1BMWproductquality
cal_sw_qualflag int32 atrack,xtrack,fov per-observationL1BSWproductquality
nedn_lw float32
fov,wnum_lw longwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
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Name Type Dimensions Description Units
AncillaryVariables
nedn_mw float32
fov,wnum_mw midwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
nedn_sw float32
fov,wnum_sw shortwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
wnum_lw float64 wnum_lw longwavewavenumber cm-1
wnum_mw float64 wnum_mw midwavewavenumber cm-1
wnum_sw float64 wnum_sw shortwavewavenumber cm-1
aux_l2Variables
Name Type Dimensions Description Units AncillaryVariables
idprof string atrack,xtrack profileID
etarej float32 atrack,xtrack cloudclearingresidualusedf/rejatiteration=ieta_rej unitless
cldfrc_tot float32 atrack,xtrack TotalcloudfractionoverFOR unitless
cldfrc_500 float32 atrack,xtrack TotalcloudfractionoverFORbelow500hPa unitless
ampl_eta float32 atrack,xtrack cloudclearingnoiseamplificationfactor unitless
ir_x float32 atrack,xtrack RMS(rad(IR.ret)-radobs())forAMSUchannels unitless
bt2 float32 atrack,xtrack RMS(T(p)f/IR.ret-T(p)f/AMSU.ret) unitless
qualsurf float32 atrack,xtrack qualsurf
qualtemp float32 atrack,xtrack qualtemp
softcode float32 atrack,xtrack softwarerejectioncode
aeff_1 float32 atrack,xtrack A_eff(1stetastep) unitless
aeff_end float32 atrack,xtrack A_eff(lastetastep) unitless
a0_cloud float32 atrack,xtrack interceptofalpha(1)=f(alpha(2))fitting unitless
totliqwat float32 atrack,xtrack totalliquidwater(MW) unitless
chi2_temp float32 atrack,xtrack Temperatureprofilechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_h2o float32 atrack,xtrack Watervaporchi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_o3 float32 atrack,xtrack Ozonechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_ch4 float32 atrack,xtrack Methanechi^2ofalpha(1)=f(alpha(2))fitting unitless
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Name Type Dimensions Description Units AncillaryVariables
chi2_co float32 atrack,xtrack Carbonmonoxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_co2 float32 atrack,xtrack Carbondioxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_n2o float32 atrack,xtrack Nitrousoxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_hno3 float32 atrack,xtrack Nitricacidchi^2ofalpha(1)=f(alpha(2))fitting unitless
chi2_so2 float32 atrack,xtrack Sulfurdioxidechi^2ofalpha(1)=f(alpha(2))fitting unitless
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C.4CHARTCloud-ClearedRadianceproduct
SNPPL2CHARTCRIMSSCCNSRInterfaceSpecificationInterfaceSpecificationVersion02.00.28
04-10-2019
GlobalGroups
Path Description
/ Mainsciencedata
/aux_l2 InternalproductteamdatafromL2
GlobalDimensions
Name Size Description
spatial 3 directions:x,y,z forsatellitepositionandvelocity
fov_poly 8 latitude/longitudepointsdefiningthepolygonboundinganFOV(anticlockwiseasviewedfromabove)
utc_tuple 8 partsofUTCtime:year,month,day,hour,minute,second,millisec,microsec
attitude 3 roll,pitch,yaw
atrack 45 along-trackhorizontaldimension
xtrack 30 cross-trackhorizontaldimension
fov 9 Field-of-viewdimension
wnum_lw 717 longwaveIRchannelnumber
wnum_mw 437 midwaveIRchannelnumber
wnum_sw 163 shortwaveIRchannelnumber
GlobalAttributes
Name Type Size Value Description
keywords string 1
EARTHSCIENCE>SPECTRAL/ENGINEERING>INFRAREDWAVELENGTHS>INFRAREDRADIANCE
Acomma-separatedlistofkeywordsand/orphrases.Keywordsmaybecommonwordsorphrases,termsfromacontrolledvocabulary(GCMDisoftenused),orURIsfortermsfromacontrolledvocabulary(seealso"keywords_vocabulary"attribute).
Conventions string 1 CF-1.6\,ACDD-1.3 Acomma-separatedlistoftheconventionsthatarefollowedbythedataset.
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Name Type Size Value Description
history string 1
Providesanaudittrailformodificationstotheoriginaldata.ThisattributeisalsointheNetCDFUsersGuide:'Thisisacharacterarraywithalineforeachinvocationofaprogramthathasmodifiedthedataset.Well-behavedgenericnetCDFapplicationsshouldappendalinecontaining:date,timeofday,username,programnameandcommandarguments.'ToincludeamorecompletedescriptionyoucanappendareferencetoanISOLineageentity;seeNOAAEDMISOLineageguidance.
source string 1 CrISandATMSinstrumenttelemetry
Themethodofproductionoftheoriginaldata.Ifitwasmodel-generated,sourceshouldnamethemodelanditsversion.Ifitisobservational,sourceshouldcharacterizeit.ThisattributeisdefinedintheCFConventions.Examples:'temperaturefromCTD#1234';'worldmodelv.0.1'.
processing_level string 1 2 Atextualdescriptionoftheprocessing(orqualitycontrol)levelofthedata.
product_name_type_id string 1 L2_CHART_CCR_NSR Productnameasitappearsinproduct_name(L1A,L1B,L2,SNO_AIRS_CrIS)
comment string 1 Miscellaneousinformationaboutthedataormethodsusedtoproduceit.Canbeempty.
acknowledgment string 1 SupportforthisresearchwasprovidedbyNASA.
Aplacetoacknowledgevarioustypesofsupportfortheprojectthatproducedthisdata.
license string 1 LimitedtoSounderSIPSaffiliates
ProvidetheURLtoastandardorspecificlicense,enter"FreelyDistributed"or"None",ordescribeanyrestrictionstodataaccessanddistributioninfreetext.
standard_name_vocabulary string 1 CFStandardNameTablev28
Thenameandversionofthecontrolledvocabularyfromwhichvariablestandardnamesaretaken.(Valuesforanystandard_nameattributemustcomefromtheCFStandardNamesvocabularyforthedatafileorproducttocomplywithCF.)Example:'CFStandardNameTablev27'.
date_created string 1 Unassigned
Thedateonwhichthisversionofthedatawascreated.(Modificationofvaluesimpliesanewversion,hencethiswouldbeassignedthedateofthemostrecentvaluesmodification.)Metadatachangesarenotconsideredwhenassigningthedate_created.TheISO8601:2004extendeddateformatisrecommended,asdescribedintheAttributeContentGuidancesection.
creator_name string 1 UnassignedThenameoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
creator_email string 1 Unassigned
Theemailaddressoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
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Name Type Size Value Description
creator_url string 1 UnassignedTheURLoftheperson(orothercreatortypespecifiedbythecreator_typeattribute)principallyresponsibleforcreatingthisdata.
institution string 1 Unassigned Processingfacilitythatproducedthisfile
project string 1 SounderSIPS
Thenameoftheproject(s)principallyresponsiblefororiginatingthisdata.Multipleprojectscanbeseparatedbycommas,asdescribedunderAttributeContentGuidelines.Examples:'PATMOS-X','ExtendedContinentalShelfProject'.
product_name_project string 1 SNDRThenameoftheprojectasitappearsinthefilename.'SNDR'forallSounderSIPSproducts,evenAIRSproducts.
publisher_name string 1 Unassigned
Thenameoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_email string 1 Unassigned
Theemailaddressoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
publisher_url string 1 Unassigned
TheURLoftheperson(orotherentityspecifiedbythepublisher_typeattribute)responsibleforpublishingthedatafileorproducttousers,withitscurrentmetadataandformat.
geospatial_bounds string 1
Describesthedata's2Dor3DgeospatialextentinOGC'sWell-KnownText(WKT)Geometryformat(referencetheOGCSimpleFeatureAccess(SFA)specification).Themeaningandorderofvaluesforeachpoint'scoordinatesdependsonthecoordinatereferencesystem(CRS).TheACDDdefaultis2DgeometryintheEPSG:4326coordinatereferencesystem.Thedefaultmaybeoverriddenwithgeospatial_bounds_crsandgeospatial_bounds_vertical_crs(seethoseattributes).EPSG:4326coordinatevaluesarelatitude(decimaldegrees_north)andlongitude(decimaldegrees_east),inthatorder.Longitudevaluesinthedefaultcasearelimitedtothe-180,180)range.Example:'POLYGON((40.26-111.29,41.26-111.29,41.26-110.29,40.26-110.29,40.26-111.29))'.
geospatial_bounds_crs string 1 EPSG:4326
Thecoordinatereferencesystem(CRS)ofthepointcoordinatesinthegeospatial_boundsattribute.ThisCRSmaybe2-dimensionalor3-dimensional,buttogetherwithgeospatial_bounds_vertical_crs,ifthatattributeissupplied,mustmatchthedimensionality,order,andmeaningofpointcoordinatevaluesinthegeospatial_boundsattribute.Ifgeospatial_bounds_vertical_crsisalsopresentthenthisattributemustonlyspecifya2DCRS.
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Name Type Size Value Description
EPSGCRSsarestronglyrecommended.Ifthisattributeisnotspecified,theCRSisassumedtobeEPSG:4326.Examples:'EPSG:4979'(the3DWGS84CRS),'EPSG:4047'.
geospatial_lat_min float 1 9.9692099683868690e+36f
Describesasimplelowerlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_minspecifiesthesouthernmostlatitudecoveredbythedataset.
geospatial_lat_max float 1 9.9692099683868690e+36f
Describesasimpleupperlatitudelimit;maybepartofa2-or3-dimensionalboundingregion.Geospatial_lat_maxspecifiesthenorthernmostlatitudecoveredbythedataset.
geospatial_lon_min float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_minspecifiesthewesternmostlongitudecoveredbythedataset.Seealsogeospatial_lon_max.
geospatial_lon_max float 1 9.9692099683868690e+36f
Describesasimplelongitudelimit;maybepartofa2-or3-dimensionalboundingregion.geospatial_lon_maxspecifiestheeasternmostlongitudecoveredbythedataset.Caseswheregeospatial_lon_minisgreaterthangeospatial_lon_maxindicatetheboundingboxextendsfromgeospatial_lon_max,throughthelongituderangediscontinuitymeridian(eithertheantimeridianfor-180:180values,orPrimeMeridianfor0:360values),togeospatial_lon_min;forexample,geospatial_lon_min=170andgeospatial_lon_max=-175incorporates15degreesoflongitude(ranges170to180and-180to-175).
time_coverage_start string 1
Nominalstarttime.Describesthetimeofthefirstdatapointinthedataset.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_first_valid_obs string 1 Describesthetimeofthefirstvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
time_coverage_mid string 1
Describesthemidpointbetweenthenominalstartandendtimes.UsetheISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_coverage_end string 1
Nominalendtime.Describesthetimeofthelastdatapointinthedataset.UseISO8601:2004dateformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
time_of_last_valid_obs string 1 Describesthetimeofthelastvaliddatapointinthedataset.UsetheISO8601:2004dateextendedformat.
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Name Type Size Value Description
time_coverage_duration string 1 P0000-00-00T00:06:00
Describesthedurationofthedataset.UseISO8601:2004durationformat,preferablytheextendedformatasrecommendedintheAttributeContentGuidancesection.
product_name_duration string 1 m06 Productdurationasitappearsinproduct_name(m06meanssixminutes)
creator_type string 1 institution
Specifiestypeofcreatorwithoneofthefollowing:'person','group','institution',or'position'.Ifthisattributeisnotspecified,thecreatorisassumedtobeaperson.
creator_institution string 1JetPropulsionLaboratory--CaliforniaInstituteofTechnology
Theinstitutionofthecreator;shoulduniquelyidentifythecreator'sinstitution.Thisattribute'svalueshouldbespecifiedevenifitmatchesthevalueofpublisher_institution,orifcreator_typeisinstitution.
product_version string 1 v01.00.00
Versionidentifierofthedatafileorproductasassignedbythedatacreator.Forexample,anewalgorithmormethodologycouldresultinanewproduct_version.
keywords_vocabulary string 1 GCMD:GCMDKeywords
Ifyouareusingacontrolledvocabularyforthewords/phrasesinyour"keywords"attribute,thisistheuniquenameoridentifierofthevocabularyfromwhichkeywordsaretaken.Ifmorethanonekeywordvocabularyisused,eachmaybepresentedwithaprefixandafollowingcomma,sothatkeywordsmayoptionallybeprefixedwiththecontrolledvocabularykey.Example:'GCMD:GCMDKeywords,CF:NetCDFCOARDSClimateandForecastStandardNames'.
platform string 1SUOMI-NPP>SuomiNationalPolar-orbitingPartnership
Nameoftheplatform(s)thatsupportedthesensordatausedtocreatethisdatasetorproduct.Platformscanbeofanytype,includingsatellite,ship,station,aircraftorother.Indicatecontrolledvocabularyusedinplatform_vocabulary.
platform_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"platform"attribute.
product_name_platform string 1 SNPP Platformnameasitappearsinproduct_name
instrument string 1
CRIMSS>Cross-trackInfraredandAdvancedTechnologyMicrowaveSounders\,CrIS>Cross-trackInfraredSounder\,ATMS>AdvancedTechnologyMicrowaveSounder
Nameofthecontributinginstrument(s)orsensor(s)usedtocreatethisdatasetorproduct.Indicatecontrolledvocabularyusedininstrument_vocabulary.
instrument_vocabulary string 1 GCMD:GCMDKeywords Controlledvocabularyforthenamesusedinthe"instrument"attribute.
product_name_instr string 1 CRIMSS Instrumentnameasitappearsinproduct_name
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Name Type Size Value Description
product_name string 1 Canonicalfullyqualifiedproductname(officialfilename)
product_name_variant string 1 std
Processingvariantidentifierasitappearsinproduct_name.'std'(shorthandfor'standard')istobethedefaultandshouldbewhatisseeninallpublicproducts.
product_name_version string 1 vxx_xx_xx Versionnumberasitappearsinproduct_name(v01_00_00)
product_name_producer string 1 TProductionfacilityasitappearsinproduct_name(singlecharacter)'T'isthedefault,forunofficiallocaltestproducts
product_name_timestamp string 1 yymmddhhmmss Processingtimestampasitappearsinproduct_name(yymmddhhmmss)
product_name_extension string 1 nc Fileextensionasitappearsinproduct_name(typicallync)
granule_number ushort 1 granulenumberofday(1-240)
product_name_granule_number string 1 g000 zero-paddedstringforgranulenumberofday(g001-g240)
gran_id string 1 yyyymmddThhmmUniquegranuleidentifieryyyymmddThhmmofgranulestart,includingyear,month,day,hour,andminuteofgranulestarttime
geospatial_lat_mid float 1 9.9692099683868690e+36f granulecenterlatitude
geospatial_lon_mid float 1 9.9692099683868690e+36f granulecenterlongitude
featureType string 1 point structureofdatainfile
data_structure string 1 swath
acharacterstringindicatingtheinternalorganizationofthedatawithcurrentlyallowedvaluesof'grid','station','trajectory',or'swath'.The'structure'heregenerallydescribesthehorizontalstructureandinallcasesdatamayalsobefunctions,forexample,ofaverticalcoordinateand/ortime.(IfusingCMORpassthisinacalltocmor_set_cur_dataset_attribute.)
cdm_data_type string 1 Swath
Thedatatype,asderivedfromUnidata'sCommonDataModelScientificDatatypesandunderstoodbyTHREDDS.(ThisisaTHREDDS"dataType",andisdifferentfromtheCFNetCDFattribute'featureType',whichindicatesaDiscreteSamplingGeometryfileinCF.)
id string 1 Unassigned
Anidentifierforthedataset,providedbyanduniquewithinitsnamingauthority.Thecombinationofthe"namingauthority"andthe"id"shouldbegloballyunique,buttheidcanbegloballyuniquebyitselfalso.IDscanbeURLs,URNs,DOIs,meaningfultextstrings,alocalkey,oranyotheruniquestringof
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Name Type Size Value Description
characters.Theidshouldnotincludewhitespacecharacters.
naming_authority string 1 Unassigned
Theorganizationthatprovidestheinitialid(seeabove)forthedataset.Thenamingauthorityshouldbeuniquelyspecifiedbythisattribute.Werecommendusingreverse-DNSnamingforthenamingauthority;URIsarealsoacceptable.Example:'edu.ucar.unidata'.
identifier_product_doi string 1 Unassigned digitalsignature
identifier_product_doi_authority string 1 Unassigned digitalsignaturesource
algorithm_version string 1
Theversionofthealgorithminwhateverformatisselectedbythedevelopers.Afterthemainalgorithmnameandversion,versionsfrommultiplesub-algorithmsmaybeconcatenatedwithsemicolonseparators.(ex:'CCAST4.2;BBemisfromMIT2016-04-01')Mustbeupdatedwitheverydeliverythatchangesnumericalresults.
production_host string 1 Identifyinginformationaboutthehostcomputerforthisrun.(Outputoflinux"uname-a"command.)
format_version string 1 v02.00.29 Formatversion.
input_file_names string 1 Semicolon-separatedlistofnamesoruniqueidentifiersoffilesthatwereusedtomakethisproduct.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_types string 1 Semicolon-separatedlistoftagsgivingtheroleofeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
input_file_dates string 1 Semicolon-separatedlistofcreationdatesforeachinputfileininput_file_names.Therewillalwaysbeonespaceaftereachsemicolon.Thereisnofinalsemicolon.
orbitDirection string 1
Orbitisascendingand/ordescending.Valuesare"Ascending"or"Descending"iftheentiregranulefitsthatdescription."NorthPole"and"SouthPole"areusedforpolar-crossinggranules."NA"isusedwhenadeterminationcannotbemade.
day_night_flag string 1
Dataisdayornight."Day"meanssubsatellitepointforallvalidscanshassolarzenithanglelessthan90degrees."Night"meanssubsatellitepointforallvalidscanshassolarzenithanglegreaterthan90degrees."Both"meansthedatasetcontainsvalidobservationswithsolarzenithangleaboveandbelow90degrees."NA"meansavaluecouldnotbedetermined.
AutomaticQualityFlag string 1 Missing "Passed":thegranulecontainsanon-degradedcalibratedbrightnesstemperature,radiance,
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Name Type Size Value Description
orretrievedvalueforatleastonevalueinageolocatedFOV;"Suspect":thegranuledoesnotqualifyas"Passed"butcontainsa(possiblydegraded)calibratedorretrievedvalue(possiblywithoutassociatedgeolocation);"Failed":thegranulecontainsnocalibratedorretrievedvalues.
qa_pct_data_missing float 1 Percentageofexpectedobservationsthataremissing.
qa_pct_data_geo float 1 Percentageofexpectedobservationsthataresuccessfullygeolocated.
qa_pct_data_sci_mode float 1 Percentageofexpectedobservationsthatweretakenwhiletheinstrumentwasinsciencemodeandaresuccessfullygeolocated.
qa_no_data string 1 TRUEAsimpleindicatorofwhetherthisisan"empty"granulewithnodatafromtheinstrument."TRUE"or"FALSE".
title string 1 Level-2CHARTSNPPCrIMSSClearRadiances
asuccinctdescriptionofwhatisinthedataset.(=ECSlongname)
summary string 1
TheLevel-2CHARTcloud-clearedproductincludesinfraredradiancesadjustedtosimulateclear-skyconditions.
Aparagraphdescribingthedataset,analogoustoanabstractforapaper.
shortname string 1 SNDRSNIML2CHTCCRN ECSShortName
product_group string 1 l2_crimss_ccThegroupnametobeusedforthisproductwhenitiscollectedinamulti-groupfiletype,likeSNOorcalsub.
metadata_link string 1 UnassignedAURLthatgivesthelocationofmorecompletemetadata.ApersistentURLisrecommendedforthisattribute.
references string 1 ATDBanddesigndocumentsdescribingprocessingalgorithms.Canbeempty.
contributor_name string 1
JoelSusskind\,NASAGSFC;WilliamJ.Blackwell\,MIT;L.LarrabeeStrow\,UMBC;PhilipW.Rosenkranz\,MIT
Thenamesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
contributor_role string 1RetrievalPI;NeuralNetworkPI;ForwardModelPI;MicrowavePI
Therolesofanyindividualsorinstitutionsthatcontributedtothecreationofthisdata.
GlobalVariables
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Name Type Dimensions Description Units
AncillaryVariables
obs_id string atrack,xtrack
uniqueearthviewobservationidentifier:yyyymmddThhmm.aaExx.Includesgran_idplus2-digitalong-trackindex(01-45)and2-digitcross-trackindex(01-30).
fov_obs_id string atrack,xtrack,fov
uniqueearthviewobservationidentifierforFOV:yyyymmddThhmm.aaExx.f.Includesgran_idplus2-digitalong-trackindex(01-45),2-digitcross-trackindex(01-30),and1-digitFOVnumber(1-9).
obs_time_tai93 double
atrack,xtrack earthviewobservationmidtimeforeachFOV
secondssince1993-01-0100:00
bnds
obs_time_utc uint16
atrack,xtrack,utc_tuple
UTCearthviewobservationtimeasanarrayofintegers:year,month,day,hour,minute,second,millisec,microsec
lat float atrack,xtrack latitudeofFORcenter degrees_nor
th bnds
lat_geoid float atrack,xtrack
latitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_north
fov_lat float atrack,xtrack,fov latitudeofFOVcenter degrees_nor
th bnds
lon float atrack,xtrack longitudeofFORcenter degrees_eas
t bnds
lon_geoid float atrack,xtrack
longitudeofFORcenteronthegeoid(withoutterraincorrection)
degrees_east
fov_lon float atrack,xtrack,fov longitudeofFOVcenter degrees_eas
t bnds
land_frac float atrack,xtrack landfractionovertheFOR unitless
fov_land_frac float atrack,xtrack,fov landfractionovertheFOV unitless
surf_alt float atrack,xtrack meansurfacealtitudewrtearthmodelovertheFOR m
fov_surf_alt float atrack,xtrack,fov meansurfacealtitudewrtearthmodelovertheFOV m
surf_alt_sdev float atrack,xtrack standarddeviationofsurfacealtitudewithintheFOR m
fov_surf_alt_sdev float atrack,xtrack,fov standarddeviationofsurfacealtitudewithintheFOV m
sun_glint_lat float atrack sunglintspotlatitudeatscan_mid_time.Fillfornightobservations.
degrees_north
sun_glint_lon float atrack sunglintspotlongitudeatscan_mid_time.Fillfornightobservations.
degrees_east
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Name Type Dimensions Description Units
AncillaryVariables
sol_zen float atrack,xtrack solarzenithangleatthecenterofthespot degree
sol_azi float atrack,xtrack
solarazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sun_glint_dist float atrack,xtrack
distanceofsunglintspottothecenterofthespot.Fillfornightobservations. m
view_ang float atrack,xtrack offnadirpointingangle degree
sat_zen float atrack,xtrack satellitezenithangleatthecenterofthespot degree
sat_azi float atrack,xtrack
satelliteazimuthangleatthecenterofthespot(clockwisefromNorth) degree
sat_range float atrack,xtrack lineofsightdistancebetweensatelliteandspotcenter m
asc_flag ubyte atrack ascendingorbitflag:1ifascending,0descending
subsat_lat float atrack sub-satellitelatitudeatscan_mid_time degrees_north
subsat_lon float atrack sub-satellitelongitudeatscan_mid_time degrees_east
scan_mid_time double atrack TAI93atmiddleofearthscenescans
secondssince1993-01-0100:00
sat_alt float atrack satellitealtitudewithrespecttoearthmodelatscan_mid_time m
sat_pos float atrack,spatial satelliteECRpositionatscan_mid_time m
sat_vel float atrack,spatial satelliteECRvelocityatscan_mid_time ms-1
sat_att float atrack,attitude
satelliteattitudeatscan_mid_time.Anorthogonaltriad.Firstelementisangleaboutthe+x(roll)ORBaxis.+xaxisispositivelyorientedinthedirectionoforbitalflight.Secondelementisangleabout+y(pitch)ORBaxis.+yaxisisorientednormaltotheorbitplanewiththepositivesenseoppositetothatoftheorbit'sangularmomentumvectorH.Thirdelementisangleabout+z(yaw)axis.+zaxisispositivelyorientedEarthwardparalleltothesatelliteradiusvectorRfromthespacecraftcenterofmasstothecenteroftheEarth.
degree
local_solar_time float atrack,xtrack localapparentsolartimeinhoursfrommidnight hours
mean_anom_wrt_equat float atrack spacecraftmeananomalymeasuredwithrespectto
theascendingnode degree
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Name Type Dimensions Description Units
AncillaryVariables
sat_sol_zen float atrack solarzenithangleatthesatellite degree
sat_sol_azi float atrack solarazimuthangleatthesatellite(clockwisefromNorth) degree
asc_node_lon float Longitudeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
degrees_east
asc_node_tai93 double
TAI93timeofthelastascendingnodeofspacecraftorbitbeforetime_coverage_end.
secondssince1993-01-0100:00
asc_node_local_solar_time float localapparentsolartimeatthelastascendingnode
beforetime_coverage_endinhoursfrommidnight hours
solar_beta_angle float Betaangleforthespacecraftorbit,determiningthepercentageoftheorbitthatthespacecraftisindirectsunlight.
degree
attitude_lbl string attitude listofrotationaldirections(roll,pitch,yaw)
spatial_lbl string spatial listofspatialdirections(X,Y,Z)
utc_tuple_lbl string utc_tuple
namesoftheelementsofUTCwhenitisexpressedasanarrayofintegersyear,month,day,hour,minute,second,millisecond,microsecond
rad_lw float32
atrack,xtrack,wnum_lw
longwaveclearspectralradiance mW/(m2srcm-1) err,qc
rad_mw float32
atrack,xtrack,wnum_mw
midwaveclearspectralradiance mW/(m2srcm-1) err,qc
rad_sw float32
atrack,xtrack,wnum_sw
shortwaveclearspectralradiance mW/(m2srcm-1) err,qc
cal_qualflag int32 atrack,xtrack,fov per-observationL1Bproductquality
cal_lw_qualflag int32 atrack,xtrack,fov per-observationL1BLWproductquality
cal_mw_qualflag int32 atrack,xtrack,fov per-observationL1BMWproductquality
cal_sw_qualflag int32 atrack,xtrack,fov per-observationL1BSWproductquality
nedn_lw float32
fov,wnum_lw longwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
nedn_mw float32
fov,wnum_mw midwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
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Name Type Dimensions Description Units
AncillaryVariables
nedn_sw float32
fov,wnum_sw shortwavenoiseequivalentdifferentialradiance mW/(m2sr
cm-1)
wnum_lw float64 wnum_lw longwavewavenumber cm-1
wnum_mw float64 wnum_mw midwavewavenumber cm-1
wnum_sw float64 wnum_sw shortwavewavenumber cm-1
aux_l2Variables
Name Type Dimensions Description Units AncillaryVariables
idprof string atrack,xtrack profileID
etarej float32 atrack,xtrack cloudclearingresidualusedf/rejatiteration=ieta_rej unitless
cldfrc_tot float32 atrack,xtrack TotalcloudfractionoverFOR unitless
cldfrc_500 float32 atrack,xtrack TotalcloudfractionoverFORbelow500hPa unitless
ampl_eta float32 atrack,xtrack cloudclearingnoiseamplificationfactor unitless
ir_x float32 atrack,xtrack RMS(rad(IR.ret)-radobs())forAMSUchannels unitless
bt2 float32 atrack,xtrack RMS(T(p)f/IR.ret-T(p)f/AMSU.ret) unitless
qualsurf float32 atrack,xtrack qualsurf
qualtemp float32 atrack,xtrack qualtemp
softcode float32 atrack,xtrack softwarerejectioncode
aeff_1 float32 atrack,xtrack A_eff(1stetastep) unitless
aeff_end float32 atrack,xtrack A_eff(lastetastep) unitless
a0_cloud float32 atrack,xtrack interceptofalpha(1)=f(alpha(2))fitting unitless
chi2_cloud float32 atrack,xtrack chi^2ofalpha(1)=f(alpha(2))fitting unitless
fzeta float32 atrack,xtrack fzeta_effect unitless
rzeta float32 atrack,xtrack rzeta_effect unitless
bias_ccdiff float32 atrack,xtrack BIAS(-Rccr)in800-900cm-1region unitless
lambda_max float32 atrack,xtrack lambda(2,iter_eta)=U^TS^TN^{-1}SU unitless
totliqwat float32 atrack,xtrack totalliquidwater(MW) unitless
etarejfinal float32 atrack,xtrack etarejfinal unitless
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Name Type Dimensions Description Units AncillaryVariables
gtest_a float32 atrack,xtrack gtest_a unitless
tsurfnoaa float32 atrack,xtrack tsurfnoaa unitless
noaadifftest float32 atrack,xtrack noaadifftest unitless
mitdifftest float32 atrack,xtrack T(p)final-T(p)startup unitless
mitsurftest float32 atrack,xtrack abs(Tsurfret-Tsurfstartup) unitless
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