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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.
https://doi.org/10.2151/jmsj.2015-005

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Highlights:

• The calibration biases of Z_H are calculated by using the self-consistency constraint between Z_H and specific differential phase shift (K_DP). 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 Z_DR calibration biases are obtained by two methods: 1) vertically pointing measurements, and 2) comparison of observed data with the average Z_H-Z_DR relationship derived from disdrometric data. The Z_DR biases are varied from 0.25 dB to 0.7 dB and both methods show similar results. This Z_H-Z_DR 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 Z_H and Z_DR 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(Z_H,Z_DR) and R(Z_H, ξ_DR) than for R(Z_H), indicating necessity of frequent calibration of Z_H and Z_DR. (Fig. 1).