水电能源科学

为评估最新一代GPM IMERG卫星降水产品在江苏省的适用性，选用73个地面站点实测降水数据为参考，利用统计学指标及极端降水指数，从日、月、季节等角度，对GPM IMERG降水产品整体及分区域进行精度评价，并评估其极端降水监测能力。结果表明，GPM卫星降水产品在江苏地区有较好的观测效果，在日、月尺度下，其整体及分区域与地面站点实测数据均具有较高的相关性(C_CC≥0.77),且随着时间尺度的增加，相关性更为显著，同时GPM卫星对实测降水量存在高估现象，月尺度下的R_RMSE相对更高。不同季节下GPM卫星观测精度存在一定差异，冬季观测效果最佳，具有高度相关性和最低的观测误差(C_CC=0.92,R_RMSE=26.37 mm,R_RB=23.4%)。GPM卫星具有较好的极端降水监测能力，能够观测和描述江苏地区极端降水的发生及降水强度，特别是在苏南地区有更好的观测效果。

In order to evaluate the applicability of the latest generation GPM IMERG satellite precipitation products in Jiangsu Province, the measured precipitation data of 73 ground stations were selected as references. Using statistical indicators and extreme precipitation index, the accuracy evaluation of GPM IMERG precipitation products were conducted from the perspectives of day, month, season, and their extreme precipitation monitoring capabilities were evaluated. The results show that the GPM satellite precipitation products have good observation effects in Jiangsu region. At the daily and monthly scales, their overall and regional data have a high correlation with ground station measured data(C_CC≥ 0.77), and the correlation becomes more significant with the increase of time scale. At the same time, the GPM satellites overestimate the measured precipitation, and the R_RMSE at the monthly scale is relatively higher. There are certain differences in the observation accuracy of GPM satellites in different seasons, and the winter observation effect is the best, with high correlation and the lowest observation error(C_CC=0.92, R_RMSE=26.37 mm, R_RB=23.4%). The GPM satellite has good ability to monitor extreme precipitation and can observe and describe the occurrence and intensity of extreme precipitation in Jiangsu region, especially in the southern Jiangsu region, with better observation effect.