The Precipitation Rate Retrieval Algorithms for the GPM Dual-frequency Precipitation Radar

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  • SETO Shinta
    Graduate School of Engineering, Nagasaki University, Nagasaki, Japan
  • IGUCHI Toshio
    University of Maryland, ESSIC, Maryland, USA
  • MENEGHINI Robert
    NASA Goddard Space Flight Center, Maryland, USA
  • AWAKA Jun
    Tokai University (Emeritus Professor), Sapporo, Japan
  • KUBOTA Takuji
    Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba, Japan
  • MASAKI Takeshi
    Remote Sensing Technology Center of Japan, Tsukuba, Japan
  • TAKAHASHI Nobuhiro
    Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan

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Other Title
  • 全球降水観測計画二周波降水レーダ(GPM/DPR)の降水強度推定アルゴリズム
  • The Precipitation Rate Retrieval Algorithms for the GPM Dual-frequency Precipitation Radar : Special Edition on Global Precipitation Measurement (GPM) : 5th Anniversary

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Abstract

<p>In this paper, precipitation rate retrieval algorithms for the Global Precipitation Measurement mission's Dual-frequency Precipitation Radar (DPR) are developed. The DPR consists of a Ku-band radar (KuPR; 13.6 GHz) and a Ka-band radar (KaPR; 35.5 GHz). For the KuPR, an algorithm similar to the Tropical Rainfall Measuring Mission's Precipitation Radar algorithm is developed, with the relation between precipitation rate R and massweighted mean diameter Dm (R−Dm relation) replacing the relation between the specific attenuation k and effective radar reflectivity factor Ze. The R−Dm relation can also be applied to the KaPR and dual-frequency algorithms. In both the single-frequency and dual-frequency algorithms, the forward retrieval method is applied with an assumed adjustment factor for the R−Dm relation (ε) and the results are evaluated to select the best value of ε. The advantages of the dual-frequency algorithm are the availability of the dual-frequency surface reference technique and the ZfKa method, which is a method to use the attenuation-corrected radar reflectivity factor Zf of KaPR, to select ε as well as the possibility to selectively use measurements from KuPR or KaPR. This paper also describes the derivation of the scattering table and the R−Dm relation as well as the procedure for non-uniform beam filling correction in detail. The outputs are then statistically analyzed to demonstrate algorithm performance.</p>

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