Analysis of Satellite-Ground Radar Reflectivity Consistency: First Evaluation Results of FY-3G and GPM Precipitation Radar

Abstract

The FY-3G Precipitation Measurement Radar (PMR), the world's second dual-frequency satellite precipitation radar (SR), provides three-dimensional precipitation structure data in mid- and low-latitude regions, with performance comparable to Global Precipitation Measurement Dual-frequency PR (GPM DPR). Ground-based weather radar (GR) data are used to perform a comparative analysis of the reflectivity consistency between PMR and DPR satellite-ground radar observations. The results indicate that PMR and DPR reflectivity factors are systematically higher than GR. PMR and DPR are 0.94 and 1.43 dB higher than CINRAD reflectivity respectively, while 1.19 and 1.98 dB higher than NEXRAD with uncertainty around 2 dB. Stratiform samples exhibit the smallest biases, with reflectivity differences further reduced below the bright band. PMR precipitation classification result aligns well with DPR. Through ground-based comparisons with CINRAD and NEXRAD, the FY-3G PMR exhibits relatively small differences. This makes it well-suited for joint global precipitation observations alongside the DPR.