S8 Radar-disdrometer comparison to reveal attenuation effects on CASA radar data

Sunday, 23 January 2011
Christopher A. Kerr, Univ. of Oklahoma, Norman, OK; and G. Zhang and P. Bukovcic

X-band radar provides a high resolution image at the cost of significant attenuation. This is due to the X-Band's short wavelength. In this study, a two-dimensional video disdrometer (2DVD) was deployed to the center of a triangle formed by three CASA dual-polarization X-band radars. The CASA radars provide measurements of reflectivity, differential reflectivity, specific differential phase, and co-polar cross-correlation coefficient of precipitation. Using drop size distributions obtained from the 2DVD, the radar variables are calculated and treated as the ground truth. The radar and disdrometer measurements are compared to reveal discrepancies. Biases and errors are calculated, and possible causes are investigated. These results can be used to further minimize the attenuation obstacle in X-band radar.
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