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X-band multi parameter (MP) radar network has an advantage in accuracy of quantitative rainfall estimation (QPE) by dual polarization parameters. However, it has an disadvantage in detecting area by considerable signal attenuation by rain particles. Therefore, combined use of both kind of radars would be anticipated. In this study, we developed an algorithm to improve QPE by conventional C-band radars through the use of X-band MP radars. The algorithm utilized microphysical properties retrieved from X-band MP radar, and provided optimum coefficients of Z-R relationship from a rain event. The rainfall distribution made from C-band radar agreed fairly well with QPE by X-band MP radar. It could be helpful for providing seamless rainfall maps.

QPE BY COMBINED USE OF X-BAND MP RADAR AND CONVENTIONAL C-BAND RADAR FOR SEAMLESS RAINFALL DISTRIBUTION