Abstract:
In order to compare and evaluate the applicability of the latest IMERG V6 version of three satellite precipitation data (Early, Late and Final) in Guangxi region, based on the precipitation data of 18 ground stations, seven evaluation indicators were selected to conduct a comprehensive evaluation from the aspects of precipitation error, seasonal average precipitation, precipitation event detection ability and others. The results showed that: ① The correlation between the three satellite precipitation data and the station precipitation data all increased with the time scale, and the three satellite precipitation data showed a good detection ability on the monthly scale, but there was a time accumulation effect of RMSE in all three satellite precipitation data. ② The three satellite precipitation data had a certain ability to characterize the average precipitation in different seasons in Guangxi, but the difference was obvious, and the accuracy of three satellite precipitation data was relatively poor in winter. ③ The error of three satellite precipitation data was large in the areas with complex topographic and meteorological factors, and the precipitation detection ability was insufficient to some extent. ④ All three satellite precipitation data can detect precipitation with different intensities, and the ability to identify precipitation events was better in rainy season, but the accuracy of satellite precipitation detection decreased with the increase of precipitation intensity. In general, the accuracy of corrected delay IMERG-F was slightly better than that of uncorrected near real-time IMERG-E and IMERG-L, and it had a certain applicability in Guangxi, but the correction process also aggravated the overestimation of precipitation.