水科学进展2025，Vol.36Issue(3)：383-396,14.DOI:10.14042/j.cnki.32.1309.2025.03.003
中国外流流域实际蒸散发变化趋势及多源蒸散产品评估
Spatiotemporal trends of actual evapotranspiration and evaluation of multi-source evapotranspiration products in China's exorheic basins
摘要
Abstract
Changes in actual evapotranspiration(ETa)affect the availability of water resources and the sustainability of ecosystems.Accurately estimating ETa and understanding its trends remain a long-standing challenge.Compared to ground-based evapotranspiration(ET)and thermal remote sensing,combining GRACE(Gravity Recovery and Climate Experiment)satellite data with the water balance equation provides a robust method to estimate long-term and basin-scale ET.Combined with streamflow observations from 72 hydrological stations,and four precipitation datasets,we calculated basin-scale ETa via the water balance method.We evaluated eight mainstream ET products—GLDAS_NOAH,GLDAS_CLSM,GLDAS_VIC,ERA5,MERRA2,GLEAM,PML_V2,and FLUXCOM—across these basins.Results showed that annual mean ETafrom 2003 to 2020 ranged between 415.1 mm and 1 001.4 mm,increasing from northwest to southeast,with an average of 626.6 mm and low uncertainty(mean:46.7 mm).ET product performance varied regionally,with relatively higher accuracy in northern part of China.The optimal land-surface-model-based product was GLDAS_NOAH,reanalysis product was ERA5,and remote sensing meteorological product was GLEAM.Specific recommendations included MERRA2 for the Songhuajiang River,GLDAS_CLSM for the Liaohe River and Huaihe River,GLDAS NOAH for the Haihe River,ERA5 for the Yellow River,and GLEAM for the Yangtze River,Southeast Rivers,and Pearl River.From 2003 to 2020,ETa increased at a rate of 5.8 mm/a,with significant upward trends in the Song-Liao River,Northern Haihe River,Southeast Rivers,Western Pearl River,and Upper Yangtze River.Land surface model selection critically influenced trend outcomes.关键词
实际蒸散发/变化趋势/遥感蒸散发估算产品/GRACE/中国外流流域Key words
actual evapotranspiration/variation trends/remote sensing ET estimation products/GRACE/China's exorheic basins分类
天文与地球科学引用本文复制引用
魏玲娜,孙小淞,董建志,高满,潘继旺,单顾天,刘松岩..中国外流流域实际蒸散发变化趋势及多源蒸散产品评估[J].水科学进展,2025,36(3):383-396,14.基金项目
国家重点研发计划项目(2024YFF0810600) （2024YFF0810600）
国家自然科学基金项目(52179021) The study is financially supported by the National Key R&D Program of China(No.2024YFF0810600)and the National Natural Science Foundation of China(No.52179021). （52179021）
