csapr > C-Band Scanning ARM Precipitation RadarInstrument Type(s) > Baseline • Guest

The C-Band Scanning ARM Precipitation Radar is a dual-polarization Doppler weather radar that operates in a simultaneous transmit and receive (STAR) mode, splitting the transmit signal so that power is transmitted on both horizontal and vertical polarizations at the same time. The CSAPR can also transmit on a single polarization (horizontal or vertical) and measure linear depolarization ratio (LDR).

In addition to the first three Doppler moments (reflectivity, radial velocity, and spectra width), the CSAPR also provides differential reflectivity, correlation coefficient, and specific differential phase. The dual-polarization variables enable the provision of rainfall rate estimates and identification of precipitation types.

For the 2018–2019 Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign in Argentina, ARM deployed a second-generation CSAPR, known as CSAPR2. CACTI data from the CSAPR2 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
Houston, TX; Supplemental Facility 2 2021-04-14


Jackson R, S Collis, V Louf, A Protat, D Wang, S Giangrande, E Thompson, B Dolan, and S Powell. 2021. "The development of rainfall retrievals from radar at Darwin." Atmospheric Measurement Techniques, 14(1), 10.5194/amt-14-53-2021.
Research Highlight


Trapp R, K Kosiba, J Marquis, M Kumjian, S Nesbitt, J Wurman, P Salio, M Grover, P Robinson, and D Hence. 2020. "Multiple-Platform and Multiple-Doppler Radar Observations of a Supercell Thunderstorm in South America during RELAMPAGO." Monthly Weather Review, 148(8), 10.1175/MWR-D-20-0125.1.

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

Iguchi T, S Rutledge, W Tao, T Matsui, B Dolan, S Lang, and J Barnum. 2020. "Impacts of aerosol and environmental conditions on maritime and continental deep convective systems using a bin microphysical model." Journal of Geophysical Research: Atmospheres, 125(12), e2019JD030952, 10.1029/2019JD030952.

Hardin JC, A Hunzinger, E Schuman, A Matthews, N Bharadwaj, K Johnson, and S Giangrande. 2020. CACTI Radar b1 Processing: Corrections, Calibrations, and Processing Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-244.

Oue M, A Tatarevic, P Kollias, D Wang, K Yu, and A Vogelmann. 2020. "The Cloud-resolving model Radar SIMulator (CR-SIM) Version 3.3: description and applications of a virtual observatory." Geoscientific Model Development, 13(4), 10.5194/gmd-13-1975-2020.
Research Highlight

Matsui T, B Dolan, T Iguchi, S Rutledge, W Tao, and S Lang. 2020. "Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment." Journal of Hydrometeorology, 21(3), 10.1175/JHM-D-19-0185.1.
Research Highlight


Kollias P, N Bharadwaj, E Clothiaux, K Lamer, M Oue, J Hardin, B Isom, I Lindenmaier, A Matthews, E Luke, S Giangrande, K Johnson, S Collis, J Comstock, and J Mather. 2019. "The ARM Radar Network: At the Leading-edge of Cloud and Precipitation Observations." Bulletin of the American Meteorological Society, 101(5), 10.1175/BAMS-D-18-0288.1.

Borque P, S Nesbitt, R Trapp, S Lasher-Trapp, and M Oue. 2019. "Observational study of the thermodynamics and morphological characteristics of a midlatitude continental cold pool event." Monthly Weather Review, 148(2), 10.1175/MWR-D-19-0068.1.

Varble A, S Nesbitt, P Salio, E Avila, P Borque, P DeMott, G McFarquhar, S van den Heever, E Zipser, D Gochis, R Houze, M Jensen, P Kollias, S Kreidenweis, R Leung, K Rasmussen, D Romps, and C Williams. 2019. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-19-028.

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