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

摘要： 为明确多源降水数据在杭嘉湖地区的适用性，为区域水文气象研究、水资源管理及洪涝/干旱预警提供可靠数据支撑，以该区域地面雨量站实测数据为基准，选取MSWEP、GPM 和GLDAS三种主流多源降水数据，采用点对点匹配方法，从年、月、日三个时间尺度，系统评估了三种数据在 1998—2021年的精度表现。结果表明，MSWEP具有最高的相关性、最低的系统偏差和最好的降水探测性，更适用于杭嘉湖地区的相关研究。本研究成果可为该区域多源降水数据的选择提供科学依据，同时为后续细化降水产品精度评估，拓展其水文应用提供参考。

关键词: 杭嘉湖, 降雨量, 多源数据, 适用性