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

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