Variability of Heavy Ice Precipitation in Eastern China Revealed by GPM DPR Observations

The Dual-frequency Precipitation Radar (DPR) aboard the Global Precipitation Measurement (GPM) core observatory possesses unique capabilities for delineating the three-dimensional structures of Heavy Ice Precipitation (HIP). This study employs a preliminary statistical analysis of 10 years of GPM DPR measurements from 2014 to 2023 to examine the spatial variability of HIP over various topographical regions in eastern China. The findings indicate that the extent and vertical depth of HIP are greater over plains compared to mountainous areas. Moreover, the seasonal distribution patterns of HIP in the southern hilly terrain and adjacent oceanic zones exhibit marked distinctions from other areas, with the most substantial coverage and thickness occurring during spring. The "high occurrence and coverage" of HIP is most likely related to the applicability of the HIP detection algorithm of GPM DPR in Eastern China. The underlying dynamic and thermodynamic factors potentially influencing these observations--particularly those relating to the monsoonal cycle and the topography of Eastern China--warrant further investigation in subsequent research.