数字农科院2.0

Evaluation of seven satellite-based and two reanalysis global terrestrial evapotranspiration products

文献类型： 外文期刊

作者： Xie Z.;Yao Y.;Tang Q.;Liu M.;Fisher J.B.;Chen J.;Zhang X.;Jia K.;Li Y.;Shang K.;Jiang B.;Yang J.;Yu R.;Zhang X.;Guo X.;Liu L.;Ning J.;Fan J.;Zhang L.

作者机构：

关键词： Evaluation methods;Evapotranspiration;Three-cornered hat;Water budget balance method

期刊名称： Journal of Hydrology

ISSN： 0022-1694

年卷期： 2024 年 630 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Although comprehensive evaluation of different types of global terrestrial evapotranspiration (ET) products has been conducted, the satellite remote sensing techniques have prompted the development of several available global ET products, warranting a reassessment as products continue to evolve. Recently, we produced the long-term Global LAnd Surface Satellite (GLASS) ET product, but there is a lack of comparison and evaluation with other ET products and EC observations on a global scale. In this study, we evaluated the accuracy and uncertainty of seven satellite-based (GLASS-AVHRR, GLASS-MODIS, BESS, FLUXCOM, GLEAM, MOD16, and PML_V2) and two reanalysis (ERA5 and MERRA2) global terrestrial ET products at multiple scales for selecting the most suitable ET products and developing large-scale ET models. At the point scale, their accuracy was evaluated through direct comparison with in situ observations from 230 global flux towers. The results indicate that no single ET product can provide the most accurate ET estimates for all land cover types, although GLASS-MODIS [coefficient of determination (R2) of 0.51, Kling–Gupta efficiency (KGE) of 0.68] and FLUXCOM [R2 of 0.51, KGE of 0.66] outperform the seven other products [0.54 =< KGE =< 0.66, 0.35 =< R2 =< 0.50] at all sites. At the basin scale, the accuracy of ET products was assessed through 36 large river basins. The R2 values between all ET products and the water balance-derived ET (WBET) are >0.88, while the accuracies of the nine ET products differ in some sense. The three-cornered hat (TCH) method and comparison analysis are applied to assess the uncertainty of nine ET products at the pixel level. The TCH outputs reveal that GLASS-AVHRR and GLASS-MODIS are the two products with the lowest relative uncertainty, while MERRA2 has the largest relative uncertainty. Our results imply that there is no single ET product performing best in all respects. The selection of ET products for scientific research should consider their performance differences in spatial scale as well as the influence of land cover and climate conditions. © 2024 Elsevier B.V.

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