Post on 02-Jan-2016
MAGIC Cloud Radars
Karen Johnsonkjohnson@bnl.gov
First MAGIC Science Workshop5/2014
Ship Layout
Location of ARM Instrumentation
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
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
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
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
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)
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)
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
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? kjohnson@bnl.gov