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MAGIC Cloud Radars Karen Johnson kjohnson@bnl.gov First MAGIC Science Workshop 5/2014
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Ship Layout Location of ARM Instrumentation
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MWACR Marine W-band ARM Cloud Radar 95 GHz, 3.2 mm Stabilized platform KAZR Ka-band ARM Zenith Radar 35 GHz, 8.6 mm NOT 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
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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
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02 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 KAZR HI MWACR Radar Data Timeline 2012.09.222013.05.112012.10.20 Good Sensitivityover all ranges Best Sensitivity; hts > 2km Better Sensitivity; Hts > 0.7km more Better Sensitivitybutattenuation Ship Leg 2012.12.152012.11.172013.07.072013.08.032013.08.312013.09.28 Radar 2013.06.08
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Reflectivity, Date vs. Height KAZR GE Reflectivity KAZR HI Reflectivity MWACR Reflectivity HlLA Date Leg 07 Range (km) 18 0 18 0 16 0
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Lowest few kilometers KAZR GE Reflectivity Lowest 4 km MWACR Reflectivity Lowest 4 km LAHlLA Date Leg 15 4040 4 0 Range (km)
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KAZR General vs. Higher Sensitivity Modes KAZR GE Reflectivity Lowest 4 km KAZR MD Reflectivity Lowest 4 km LAHlLA Date Leg 15 4 0 4 0 Range (km) 4 0 4 0
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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
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Status of Radar Data Corrections to be done: Calibration of Reflectivity : Just received KAZR ‘internal’ calibration values Will omit spurious lowest range gates esp. KAZR MD: don’t use data below ~700m Will 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
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