基于遥感降水产品的西南地区降水时空动态分析.

[Objective] The aims of this study are to explore the applicability of remote sensing precipitation products in southwest China, to reveal the spatial and temporal characteristics of precipitation in Southwest China, and to provide scientific references for the assessment of droughts and floods in southwest China and the utilization of water resources. [Methods] Firstly, combined with precipitation data from 100 ground- based meteorological stations in the study region, the applicability of TRMM and GPM precipitation products were evaluated on both the multi-year average and inter-annual scales, as well as the meteorological station scale. Subsequently, based on the preferred remote sensing precipitation product, the coefficient of variation method, Theil-Sen median trend analysis coupled with Mann-Kendall significance test and Hurst exponent were adopted to analyze spatiotemporal changes of precipitation and assess their sustainability. Moreover, our effort predicted the precipitation trends in the future. [Results (1) Both TRMM and GPM products demonstrated good consistency and applicability in southwest China, albeit with some overestimation. However, compared with TRMM, GPM displayed a higher spatial resolution and better data quality, which was overall closer to the measured data. (2) Precipitation in southwest China had experienced low and moderate fluctuations over the past 19 years, with 87.54% of the region. The trend for precipitation changes in this region had mostly been increasing (83.71%), mainly weak to moderate sustainability (50.38% weak. 24.30% moderate). The prediction for future precipitation trend as a whole suggested a general increase in precipitation, with 62.24% of the region showing increasing trends, mainly in the central part of the study region, and 13.23% showing trends, mainly in the central Yunnan and southwestern Sichuan regions. This effort provided valuable insights for decision-making related to agricultural production and water resources management in southwest China. [Conclusion GPM is more suitable than TRMM to characterize the precipitation characteristics in southwest China and can be effectively used to carry out spatiotemporal dynamic analysis of precipitation. [ABSTRACT FROM AUTHOR]