Kwon, S., G. W. Lee, and G. Kim, 2015: Rainfall estimation from an operational S-band dual-polarization radar: Effect of radar calibration. J. Meteor. Soc. Japan, 93, 65-79.
- The calibration biases of ZH are calculated by using the self-consistency constraint between ZH and specific differential phase shift (KDP). This procedure is performed every 2.5 min. The biases are varied from -3.3 dB to 0.8 dB during the period between July 2010 to October 2011
- The ZDR calibration biases are obtained by two methods: 1) vertically pointing measurements, and 2) comparison of observed data with the average ZH-ZDR relationship derived from disdrometric data. The ZDR biases are varied from 0.25 dB to 0.7 dB and both methods show similar results. This ZH-ZDR technique can be applied for a volume scan and does not require a special scan.
- The verification of rainfall estimation is performed by applying 1) average ZH and ZDR calibration biases for the entire period, and 2) adaptive calibration biases that vary each rain event. The application of adaptive calibration biases is more effective for R(ZH,ZDR) and R(ZH, ξDR) than for R(ZH), indicating necessity of frequent calibration of ZH and ZDR. (Fig. 1).