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MAGIC Cloud Radars Karen Johnson [email protected] First MAGIC Science Workshop 5/2014.
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Transcript of MAGIC Cloud Radars Karen Johnson [email protected] First MAGIC Science Workshop 5/2014.
![Page 2: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/2.jpg)
Ship Layout
Location of ARM Instrumentation
![Page 3: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/3.jpg)
MWACRMarine W-band ARM Cloud Radar95 GHz, 3.2 mmStabilized platform
KAZRKa-band ARM Zenith Radar35 GHz, 8.6 mmNOT stabilized
About the radars
vertically-pointing stored Radar Moments:
• Reflectivity• Mean Doppler velocity• Spectrum width
stored Spectra had high data rates
Both Radars…
Beam-steerable wind profiler
![Page 4: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/4.jpg)
What do cloud radars provide?. . . Cloud Properties!
Moments + Signal-to-noise ratio • Cloud layer bases, tops• Cloud fraction• Reflectivity of clouds • Hydrometeor vertical motions
Ka- and W-band spectra, together • Drop size distribution• Vertical air velocity• Effective Radius
![Page 5: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/5.jpg)
02 03 04 05 06
07 08 09 10 11 12 13 14 15 16 17 18 19 20
KAZR GE
KAZR MD
KAZR HI
MWACR
Radar Data Timeline20
12.
09.
22
201
3.0
5.11
201
2.1
0.2
0
Good Sensitivity over all ranges
Best Sensitivity; hts > 2km
Better Sensitivity; Hts > 0.7km
more Better Sensitivity but attenuation
Ship Leg
201
2.1
2.1
5
201
2.11
.17
201
3.0
7.0
7
201
3.0
8.0
3
201
3.0
8.3
1
201
3.0
9.2
8
Radar
201
3.0
6.0
8
![Page 6: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/6.jpg)
Reflectivity, Date vs. Height
KAZR GE Reflectivity
KAZR HI Reflectivity
MWACR Reflectivity
Hl LALA
Date
Leg 07
Ran
ge (
km)
18
0
18
0
16
0
![Page 7: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/7.jpg)
Lowest few kilometers
KAZR GE ReflectivityLowest 4 km
MWACR ReflectivityLowest 4 km
LA Hl LA
Date
Leg 154
0
4
0
Ran
ge (
km)
Ran
ge (
km)
![Page 8: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/8.jpg)
KAZR General vs. Higher Sensitivity Modes
KAZR GE ReflectivityLowest 4 km
KAZR MD ReflectivityLowest 4 km
LA Hl LA
Date
Leg 15 4
0
Ran
ge (
km)
4
0
Ran
ge (
km)
![Page 9: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/9.jpg)
Availability of Radar Data
All data ingested (netCDF) and available at the ARM Archive.magkazrgeM1.a1
magkazrmdM1.a1 or magkazrhiM1.a1
magmwacrM1.a1
Spectra data also has been ingested; most is at the Archive now.
Leg-by-leg Images are here:http://www.gim.bnl.gov/armclouds/MAGIC/MAGIC_image_table.htm
![Page 10: MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649ed95503460f94be707f/html5/thumbnails/10.jpg)
Status of Radar Data
Corrections to be done:• Calibration of Reflectivity:
Just received KAZR ‘internal’ calibration valuesWill omit spurious lowest range gates
esp. KAZR MD: don’t use data below ~700mWill be reprocessing to apply them very soon
• Ship Motion Compensation (SHIPCOR VAP)
VAPs to be run: (after corrections done)• KAZR-ARSCL, WACR-ARSCL• MicroARSCL (spectra)• ??
Questions? See something odd? [email protected]