Atmospheric Radiation Measurement Climate Research Facility US Department of Energy


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kasacrgridrhi > Ka-Band Scanning ARM Cloud Radar RHI scan, Cartesian Cloud Cover Grid VAPVAP Type(s) > Evaluation

Scanning ARM Cloud Radar Grid (SACRGRID) value-added products, such as KASACRGRIDRHI for the Ka-band SACR, provide radar moments from range-height indicator (RHI) scans on a Cartesian grid. The gridded radar moments include reflectivity, mean Doppler velocity, spectral width, signal-to-noise ratio, and differential phase. The moments are accompanied by a significant detection mask, linear depolarization ratio, and copolar-to-crosspolar correlation coefficient.

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Input data are a1-level (uncalibrated) or b1-level (calibrated) hemispheric sky RHI data. A nearest neighbor algorithm is used for gridding, with a censor mask applied. Gaseous attenuation correction is also applied before gridding. The output is a single netCDF file containing all aforementioned radar moments remapped onto a two-dimensional (2D) Cartesian grid.

With this VAP, scientists can more easily use KASACR RHI observations in applications that benefit from having measurements on a Cartesian grid, such as for model comparisons. The censor mask helps users distinguish hydrometeor observations from background noise. The gaseous attenuation correction eliminates water vapor as a source of signal attenuation.

Primary Derived Measurements


  • Fixed
  • AMF1
  • AMF2
  • AMF3


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 ├ľktem, 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, 102(8), 10.1175/BAMS-D-20-0030.1.
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Scott Giangrande
Brookhaven National Laboratory

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