关键词: 杭嘉湖, 降雨量, 多源数据, 适用性

Abstract: To clarify the applicability of multi-source precipitation data in the Hangzhou-Jiaxing-Hu_ zhou region and provide reliable data support for regional hydrometeorological research, water resource management and flood and drought early warning, this study uses the measured data from in-situ rain gauges as the reference. Three mainstream multi-source precipitation products of MSWEP, GPM and GLDAS are selected, and a point-to-point matching method is adopted to systematically evaluate their accuracy from 1998 to 2021 on annual, monthly and daily temporal scales. The results show that MSWEP presents the highest correlation, the lowest systematic bias and the best precipitation detection capability, making it more suitable for relevant studies of Hangzhou-Jiaxing-Huzhou region. This study can provide a scientific basis for the selection of multi-source precipitation data in this region, and also offer a reference for the subsequent refinement of accuracy evaluation of precipitation product and the expansion of hydrological application.

Key words: Hangzhou-Jiaxing-Huzhou region, precipitation, multi-source data, applicability