Estimation of raindrop size distribution parameter using 2-scale model

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The modeling and its parameter estimation of raindrop size distribution (DSD) are important for the accuracy improvement in radar remote sensing of rainfall. Based on past studies on DSD modeling and radar rainfall estimation algorithms, the concept of "2-scale" DSD model was proposed. A new method for the DSD parameter estimation was developed. This method was applied to several locations in the world and statistical properties of DSD parameters were elucidated. In addition, it was confirmed that DSD parameters can be estimated from spaceborne radar measurements. A dual-frequency atmospheric radar algorithm was developed to estimate vertical profile of DSD.