USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY
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Transcript of USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY
USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY
Randall Martin
Mid-July
SAO
Halifax, Nova Scotia
RETRIEVAL AND INTERPRETATION OF SATELLITE RETRIEVAL AND INTERPRETATION OF SATELLITE OBSERVATIONS OF THE TROPOSPHEREOBSERVATIONS OF THE TROPOSPHERE
Instrument Coverage Typical resolution
(km)
GOME 1995- 40x320
SCIAMACHY 2002- 30x60
OMI 2004- 13x24
NO2, HCHO, O3, SO2, BrO
GEOS-CHEM MODEL IDENTIFIES FAVORABLE REGIONS TO DETERMINE STRATOSPHERIC COLUMN
AND INSTRUMENT BIASES
Martin et al., 2002
SLANT COLUMNS OF TROPOSPHERIC NOSLANT COLUMNS OF TROPOSPHERIC NO22 FROM GOME FROM GOME
1996
Martin et al., 2002
USE GEOS-CHEM TO CALCULATE AMFs FOR NOUSE GEOS-CHEM TO CALCULATE AMFs FOR NO22 and and
HCHO FOR EVERY SATELLITE VIEWING SCENEHCHO FOR EVERY SATELLITE VIEWING SCENE
SATELLITE DATA
SLANTCOLUMN
GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY:
provides shape factors
AMF
VERTICALCOLUMN
VERTICALCOLUMN
• Best information applied to each scene• Consistency in comparing model and observed columns
ADVANTAGES OF 3-D MODEL APPROACHFOR COMPUTING AMFs
spectralfit
LIDORT RAD.TRANSFER MODEL:
provides scattering weights
GOME Tropospheric NO2 GEOS-CHEM Tropospheric NO2
1015 molecules cm-2
Martin et al., 2003Martin et al., 2003
OPTIMIZE INVENTORY USING OPTIMIZE INVENTORY USING A PRIORIA PRIORI BOTTOM-UP AND BOTTOM-UP AND GOME TOP-DOWN INFORMATIONGOME TOP-DOWN INFORMATION
Determine NOx Emissions from GOME Observations Using GEOS-CHEM to Provide Information on the NOx/NO2 Ratio and NOx Lifetime
IN THE QUEUE: GEOS-CHEM NOIN THE QUEUE: GEOS-CHEM NOXX EMISSIONS WILL REFLECT EMISSIONS WILL REFLECT
ADDITIONAL GOME INFORMATIONADDITIONAL GOME INFORMATION
Annual mean ratio (A posteriori / A priori)
Martin et al., 2003Martin et al., 2003
EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM HCHO COLUMNS: HCHO COLUMNS: SAO Role in Retrieval, AMFs, and Model SimulationSAO Role in Retrieval, AMFs, and Model Simulation
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
Abbot et al., 2003Abbot et al., 2003
EL NINO INTERANNUAL VARIABILITY IN OZONE:EL NINO INTERANNUAL VARIABILITY IN OZONE:DIFFERENCE BETWEEN OCT 97 AND OCT 96DIFFERENCE BETWEEN OCT 97 AND OCT 96
Chandra et al. [2002]
TOMS
TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER EVIDENCE THAT OZONE IS TOO HIGH OVER INDIAEVIDENCE THAT OZONE IS TOO HIGH OVER INDIA
Dobson Units for March, April, May
TOMS/MLS
GEOS-CHEM
30 N
30 S
30 N
30 SChandra et al., 2003Chandra et al., 2003
OPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMIOPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMI
Uses Monthly Mean HCHO Shape Factors from GEOS-CHEMUses Monthly Mean HCHO Shape Factors from GEOS-CHEM
SUPPORT FOR GMISUPPORT FOR GMI
•Provide GEOS-CHEM resultsProvide GEOS-CHEM results for various simulations (i.e. with and without aerosols)
•Assist interpretation of model results
EVALUATE GEOS-CHEM SIMULATION OF NOEVALUATE GEOS-CHEM SIMULATION OF NOX X
With With In SituIn Situ NO NO22 Measurements from SOS (1999) and TEXAQS (2000) Measurements from SOS (1999) and TEXAQS (2000)
FUTURE USE OF GEOS-CHEM AT DALHOUSIEFUTURE USE OF GEOS-CHEM AT DALHOUSIE
Likely local platforms: Likely local platforms:
8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)
20-Processor 700 MHz SGI Origin 35020-Processor 700 MHz SGI Origin 350
Continued support for GMI Continued support for GMI
Real-time HCHO and NOReal-time HCHO and NO22 Retrievals from SCIAMACHY for INTEX Retrievals from SCIAMACHY for INTEX
Use Shape Factors from GEOS-CHEMUse Shape Factors from GEOS-CHEM
Retrieval and Interpretation of HCHO, NORetrieval and Interpretation of HCHO, NO22, SO, SO22, O, O33, BrO, CO from , BrO, CO from
TOMS / GOME / SCIAMACHY / OMITOMS / GOME / SCIAMACHY / OMI
Interpretation of satellite observations from MOPITT, MODIS, TES, … Interpretation of satellite observations from MOPITT, MODIS, TES, … and aircraft missions such as INTEX, ITCT-2K4, …and aircraft missions such as INTEX, ITCT-2K4, …