关键词: 卫星降水；适用性评估；CHIRPS；IMERG；GSMaP；金沙江流域

Abstract: Accurate precipitation estimation with high spatial and temporal resolution is crucial for regional hydrological simulation and water resources management. To investigate the applicability of satellite precipitation products with high spatial and temporal resolution in the Jinsha River Basin, spatial distribution characteristics of annual average daily precipitation, spatial distribution of errors, and the performance in different climatic years and altitude regions of three satellite precipitation products (CHIRPS, IMERG, and GSMaP) were comprehensively analyzed using statistical and classification indexes. This analysis was based on rain gauge observations provided by the China Meteorological Administration. The results show that: ①The spatial distribution characteristics of all satellite precipitation products are similar, showing an increasing trend from the northwest to the southeast in the Jinsha River Basin. ②GSMaP shows a higher correlation ((CC=0.66), a lower root mean squared error (RMSE =6.38 ), and a stronger detection ability for precipitation events (POD=0.72, FAR=0.29). In addition, the accuracies of all satellite precipitation products are consistently higher during wet years compared to dry years. ③GSMaP consistently demonstrates superior performance compared to other satellite precipitation products across various altitude zones. Relatively, the accuracies of all satellite precipitation produces are higher in high-altitude than in low-altitude regions. Generally, GSMaP has the highest accuracy, which can provide data support for disaster prevention and reduction and hydrological simulation in the Jinsha River Basin.

Key words: satellite precipitation; applicability assessment; CHIRPS; IMERG; GSMaP; Jinsha River Basin