Comprehensive evaluation of nine evapotranspiration products from remote sensing, gauge upscaling and land surface model over China

Dayang Wang, Dagang Wang, Shaobo Liu, Ya Huang, Qing Yang, Xiaohang Ma and Zequn Lin

PLOS ONE, 2024, vol. 19, issue 11, 1-19

Abstract: Benefiting from the advancements in monitoring and measuring terrestrial evapotranspiration (ET), diverse ET products have been proliferated. This study evaluated nine ET products from three types, namely remote sensing-based retrievals (GLEAM, PML and PLSH), gauge-based upscaling (FCCRU, FCGSW and FCWFD) and land surface model-based reanalysis (ERA5-Land, GLDAS and MERRA) over China and its seven climate zones. Both spatial and temporal change trends in ET were investigated, and period feature were analyzed. Then, in-situ ET observations were used for validating the performances of ET products. The results demonstrate that all products show comparable performances in spatial distribution over China, but the mean ET values present evident discrepancies (433–563 mm/a). Among them, reanalysis ET products reproduce higher ET, but with less difference. In terms of climate sub-regions, the most significant discrepancies are located in QT. In addition, PLSH, MERRA and GLDAS present substantial increasing trends, while all three gauge-based upscaling ET products display decreasing trends. Regionally, all the ET products show positive trends in QT. Moreover, most of ET products present apparent periodic oscillation ranging from 2.0–5.5 year scales. At point scale, most ET products perform well at NMG and CBS sites (CC > 0.80, RMSE

Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0313762

DOI: 10.1371/journal.pone.0313762

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