ESTIMATION OF RAINDROP SIZE DISTRIBUTION AND PRECIPITATION USING X-BAND MULTI-PARAMETER RADAR INFORMATION

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  • Xバンドマルチパラメータレーダを用いた雨滴粒径分布と降水量の推定

Abstract

<p> To accurately estimate raindrop size distribution (DSD) and rain rate from multi-parameter radar, in this study, an advanced estimation algorithm was proposed basing on a conventional method proposed by Yamaguchi (2012) (Yamaguchi method). Yamaguchi method retrieves DSD parameters from radar reflectivity (Zh) and specific differential phase shift (KDP). However, Zh is often underestimated due to rain attenuation, in the case that rain attenuation is strongly occurring. In this study, a new advanced method to retrieve accurate DSD information has been developed to solve the rain attenuation problem. DSD retrieved from KDP and difference reflectivity (ZDP) theoretically showed higher accuracy than that from KDP and Zh in large attenuation cases under pseudo observation experiments. This fact was also evaluated by observation data using an operational X-band multi-parameter radar and a raindrop disdrometer. These results are induced by the fact that Zh is largely affected by intense rainfall attenuation compared with ZDP. Therefore, it is concluded that the proposed new method is possible to retrieve DSD with higher accuracy than Yamaguchi method because rain attenuation is greatly affect retrieval accuracy of DSD.</p>

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