在广东省研究新一代 GPM(Global?Precipitation?Measurement) 产品的精度及其探测极端降水事件的能力，探 讨其对地面站点观测数据的可替代性，可为 GPM 产品在中国南方湿润区的应用提供参考依据。以广东省的珠江 流域、韩江及粤东诸河流域、粤西沿海诸河流域为研究区，采用国家基准气象站观测的降水量为基准数据，使用 相关系数 R、平均绝对误差 EMA、均方根误差 ERMS、相对偏差 BIAS、探测率 POD、空报率 FAR和成功系数 CSI共 7 个 指标验证 GPM 遥感降水产品与?TRMM(Tropical?Rainfall?Measuring?Mission) 产品的精度；对 GPM 产品与 TRMM 产品在广东省的各个子流域的精度进行对比分析；使用 9 种广泛应用的极端降水指数来描述研究区域的极端降 水特征，对比分析 TRMM 产品与 GPM 产品探测极端降水事件的能力。研究结果表明：以地面实测降水为基准， GPM 与 TRMM 产品在广东省的平均 R 值分别为 0.57 与 0.49，BIAS值分别为 7.93% 与 9.13%，CSI值分别为 0.51 与 0.44，表明两种遥感降水产品均有一定的偏差；从整体上来看，相较 TRMM 而言，GPM 的精度更高；对比广东省的 不同子流域，GPM 产品与 TRMM 产品在珠江三角洲的 BIAS值分别仅为 2.28% 与 8.72%，表明两种遥感降水产品在 珠江三角洲流域的精度最高。在探测极端降水方面，GPM 产品对中雨、大雨和连续无雨日数都有更为准确的监 测。综合来看，GPM 新一代遥感降水产品精度较高、对极端降水探测能力强，更适用于广东省的洪水、旱情监测， 在广东省特别是珠江三角洲具有巨大的应用潜力。

The precision of the new generation Global Precision Measurement (GPM) product and its ability to detect extreme precipitation events in Guangdong Province wad studied, and its substitutability for ground station observation data was discussed, which can provide a reference for the application of GPM products in humid areas in southern China.The Pearl River basin, Hanjiang River basin, eastern Guangdong river basins, and western Guangdong coastal river basins in Guangdong Province were taken as the study area, and the precipitation observed by the national benchmark meteorological station was used as the benchmark data. The precision of GPM and Tropical Rainfall Measuring Mission (TRMM) products were verified by seven indicators, including correlation coefficient, average absolute error, root mean square error, relative deviation, detection rate, air reporting rate, and the success coefficient. The precision of GPM and TRMM products in each sub-basin of Guangdong Province was compared and analyzed. Widely used extreme precipitation indexes were used to describe the characteristics of extreme precipitation in the study area, and the ability of GPM and TRMM was analyzed to detect extreme precipitation events. The results showed that: Taking the measured precipitation on the ground as the reference data, the R values of GPM and TRMM products in Guangdong Province were 0.57 and 0.49 respectively, the BIAS values were 7.93% and 9.13% respectively, and the CSI values were 0.51 and 0.44 respectively, indicating that there was certain deviation between the two remote sensing precipitation products. On the whole, GPM was more accurate than TRMM. Comparing different sub-basins in Guangdong Province, the BIAS values of GPM products and TRMM products in the Pearl River Delta were only 2.28% and 8.72%, respectively, indicating that the two remote sensing precipitation products had the highest accuracy in the Pearl River Delta basin. In terms of detecting extreme precipitation, GPM products had more accurate monitoring of moderate rain, heavy rain, and consecutive days without rain.The new generation of remote sensing precipitation products of GPM had high precision and strong detection ability for extreme precipitation, which were more suitable for flood and drought monitoring in Guangdong Province, and had huge application potential in Guangdong Province, especially in the Pearl River Delta.