Accuracy evaluation of GPM multi-satellite precipitation products in the hydrological application over alpine and gorge regions with sparse rain gauge network

With the release of Global Precipitation Measurement Integrated Multi-satellitE Retrievals for GPM products, hydrologists can obtain precipitation data with higher resolution and wider coverage. However, great uncertainties still exist in the accuracy and hydrological utility of these data in alpine and gorge regions with sparse gauge stations. In this study, the Lancang River Basin in China was used as an example, and near real-time products (IMERG-E and IMERG-L) and post-processed products (IMERG-F and TMPA 3B42-V7) were evaluated. Different indexes and methods were applied to evaluate the accuracy of these products. The variable infiltration capacity hydrological model was adopted to evaluate their hydrological utility. The following findings were obtained: (1) Compared with observed precipitation data, the near real-time products tend to underestimate, while the post-processed products tend to overestimate precipitation. The performance of the four products in winter is poor. (2) IMERG products offer improvements in two aspects: first, the near real-time products achieve good accuracy and second, the detectability and the accuracy in gorge areas have been greatly improved. (3) The near real-time products have the potential for hydrological applications. The best simulation result was obtained based on IMERG-F, followed by 3B42-V7, IMERG-E, and IMERG-L. (4) The four products can provide reliable precipitation data for the hydrological application over the Lancang River Basin. doi: 10.2166/nh.2019.133 s://iwaponline.com/hr/article-pdf/doi/10.2166/nh.2019.133/613029/nh2019133.pdf Jiachao Chen Zhaoli Wang (corresponding author) Xushu Wu Chengguang Lai Zhaoyang Zeng Jun Li School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China E-mail: wangzhl@scut.edu.cn Jiachao Chen Zhaoli Wang Chengguang Lai Zhaoyang Zeng Jun Li State Key Lab of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China Xushu Wu School of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan 430072, China Xiaohong Chen Center for Water Resource and Environment, Sun Yat-Sen University, Guangzhou 510275, China