GPM遥感降水产品在广东省的极端降水事件适用性分析  

Applicability analysis of GPM remote sensing precipitation products in extreme precipitation events in Guangdong Province

作　　者：刘洁 黄本胜[1] 陈晓宏[2] 陈亮雄[1] 杨静学[1] 夏军[3] LIU Jie;HUANG Bensheng;CHEN Xiaohong;CHEN Liangxiong;YANG Jingxue;XIA Jun(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Research Center of Water Resources and Environment,Sun Yat-Sen University,Guangzhou 510275,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]广东省水利水电科学研究院,广州510635 [2]中山大学水资源与环境研究中心,广州510275 [3]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《南水北调与水利科技（中英文）》2023年第1期87-94,共8页South-to-North Water Transfers and Water Science & Technology

基　　金：广东省重点领域研发计划项目(2020B0101130018);广东省水利科技创新项目(2020-06)。

摘　　要：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,B_(IAS)值分别为7.93%与9.13%,C_(SI)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B_(IAS)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 B_(IAS) values were 7.93% and9.13% respectively, and the C_(SI) 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 B_(IAS) 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

关 键 词：遥感降水产品 GPM 广东省 极端降水 

分 类 号：TV11[水利工程—水文学及水资源]