Evaluation of CMPAS precipitation products over Sichuan, China

High-quality and high-resolution precipitation data are the basis for mesoscale numerical weather forecasting, model verification, and hydrological monitoring, which play an important role in meteorological and hydrological disaster prevention and mitigation. In this study, high-density rain gauge data are used to evaluate the fusion accuracy of the China Meteorological Administration Multisource Precipitation Analysis System (CMPAS), and four CMPAS products with different spatial and temporal resolution and different data sources are compared, to derive the applicability of CMPAS. Results show that all the CMPAS products show high accuracy in the Sichuan Basin, followed by Panxi Area and the western Sichuan Plateau. The errors of the four products all rise with the increase in precipitation. CMPAS overestimates precipitation in summer and autumn and underestimates it in spring and winter. Overall, the applicability of these fused data in the Sichuan Basin is quite good. Due to the lack of observations and the influence of the terrain and meteorological conditions, the evaluation of CMPAS in the plateau area needs further analysis.