Comparisons of various evapotranspiration products in the Hanjiang River Basin

Evapotranspiration (ET) plays a critical role in linking the water and energy cycle. Accurately estimating ET is important for hydrologic study and supports the optimal allocation and sustainable use of water resources. In this study, monthly precipitation data, runoff data, and GRACE terrestrial water storage data were used to estimate ET with the water balance approach ( ET_WB ) as the reference. 9 ET products, including land surface model products ET_clm, ET_noah, ET_mos and ET_vic, reanalysis product ET_jra, model tree set-based flux obser vation products ET_jung, and energy balance-based diagnosis models ET_modis, ET_PML, and ET_Zhangke, were compared in the Hanjiang River Basin. The results showed that the model tree set-based flux observation product and energy balance-based diagnosis model products had better accuracy, followed by the reanalysis product and the land surface model products. ET_jung , ET_modis, and ET_clm had a good correlation with ET_ WB on the monthly scale. ET_noah, ET_mos, and ET_vic had large error among the 9 products. This study can provide a scientific reference for the hydrologic study of the Han River and the management of the Middle Route of the South-to-North Water Transfer Project.

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