kasacr > Ka-Band Scanning ARM Cloud RadarVAP Type(s) > Baseline • Evaluation • Guest

The Ka-Band Scanning ARM Cloud Radar (KASACR) records cloud properties.

ARM’s scanning cloud radars are dual-frequency, dual-polarization Doppler radars mounted on a common scanning pedestal. Each pedestal includes a Ka-band radar (2kW peak power) and the deployment location determines whether the second radar is a W-band (1.7 kW peak power) or an X-band (20 kW peak power).

Beamwidths for Ka-bands paired with W-bands are roughly matched at 0.3 degrees. The X-band beamwidth is approximately 1 degree. Due to the narrow antenna beamwidth, ARM’s scanning cloud radars use scanning strategies unlike typical weather radars. Rather than focusing on plan position indicator, or PPI, scans, the KASACR uses range height indicator, or RHI, scans at numerous azimuths to obtain cloud volume data. Measurements collected with the KASACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ratio.

KASACR data from the 2018–2019 Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign in Argentina are now available as b1-level products. Building on the original CACTI operational data, the b1-level products feature improved data quality resulting from extensive analyses and corrections. The data are cross-calibrated to a common point, datastreams are corrected for operational issues that occurred during the campaign, and several data quality masks and basic derived products are incorporated. For more information, read the CACTI radar b1-level processing report.



  • Fixed
  • AMF1
  • AMF2
  • AMF3

Active Instrument Locations

Facility Name Instrument Start Date
Central Facility, Barrow AK 2011-06-24


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Varble A, S Nesbitt, P Salio, J Hardin, N Bharadwaj, P Borque, P DeMott, Z Feng, T Hill, J Marquis, A Matthews, F Mei, R Öktem, V Castro, L Goldberger, A Hunzinger, K Barry, S Kreidenweis, G McFarquhar, L McMurdie, M Pekour, H Powers, D Romps, C Saulo, B Schmid, J Tomlinson, S van den Heever, A Zelenyuk, Z Zhang, and E Zipser. 2021. "Utilizing a Storm-Generating Hotspot to Study Convective Cloud Transitions: The CACTI Experiment." Bulletin of the American Meteorological Society, , 10.1175/BAMS-D-20-0030.1. ONLINE.

Matrosov S. 2021. "Polarimetric Radar Variables in Snowfall at Ka- and W-Band Frequency Bands: A Comparative Analysis." Journal of Atmospheric and Oceanic Technology, 38(1), 10.1175/JTECH-D-20-0138.1.

Geerts B, G McFarquhar, L Xue, M Jensen, P Kollias, M Ovchinnikov, M Shupe, P DeMott, Y Wang, M Tjernstrom, P Field, S Abel, T Spengler, R Neggers, S Crewell, M Wendisch, and C Lupkes. 2021. Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-21-001.


Cooper KB, RM Beauchamp, RJ Roy, L Millan, MD Lebsock, and RR Monje. 2020. Cloud Dynamics Revealed by a G-band Humidity-Sounding Differential Absorption Radar. In IEEE Radar Conference (RadarConf20), pp. 1-5. Piscataway, NJ: IEEE.

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Serra Y, A Rowe, D Adams, and G Kiladis. 2020. "Kelvin Waves during GOAmazon and Their Relationship to Deep Convection." Journal of the Atmospheric Sciences, 77(10), 10.1175/JAS-D-20-0008.1.
Research Highlight

Li H, J Tiira, A von Lerber, and D Moisseev. 2020. "Towards the connection between snow microphysics and melting layer: insights from multifrequency and dual-polarization radar observations during BAECC." Atmospheric Chemistry and Physics, 20(15), 10.5194/acp-20-9547-2020.

Hunzinger A, J Hardin, N Bharadwaj, A Varble, and A Matthews. 2020. "An extended radar relative calibration adjustment (eRCA) technique for higher-frequency radars and range–height indicator (RHI) scans." Atmospheric Measurement Techniques, 13(6), 10.5194/amt-13-3147-2020.
Research Highlight

Chase R, S Nesbitt, and G McFarquhar. 2020. "Evaluation of the Microphysical Assumptions within GPM-DPR Using Ground-Based Observations of Rain and Snow." Atmosphere, 11(6), 10.3390/atmos11060619.

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