Quantitative Precipitation Estimation by Real-Time Estimation of Drop Size Distribution Using Polarimetric Radar

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In Japan, X-band polarimetric weather radar network is currently-operated. Polarimetric radar has an advantage over conventional non-polarimetric systems since they measure raindrop-shape-related parameters. In this study, a retrieval methodology of raindrop size distribution (DSD) is used to improve accuracy of quantitative precipitation estimation (QPE). After the accuracy of retrieved DSD is checked through a rain gauge on surface, 3-D drop size distribution of cumulonimbus is retrieved from X-band polarimetric radar. Next, a raindrop evolution model is used to estimate DSD at ground level. The model is used to lessen the gap of rainfall rate between radar observation height and ground level. Grown rate of DSD at ground level is given to rainfall rate estimating algorithm.