Articles | Volume 24, issue 4
Hydrol. Earth Syst. Sci., 24, 1927–1938, 2020
https://doi.org/10.5194/hess-24-1927-2020
Hydrol. Earth Syst. Sci., 24, 1927–1938, 2020
https://doi.org/10.5194/hess-24-1927-2020

Research article 16 Apr 2020

Research article | 16 Apr 2020

Global assessment of how averaging over spatial heterogeneity in precipitation and potential evapotranspiration affects modeled evapotranspiration rates

Elham Rouholahnejad Freund et al.

Data sets

Average precipitation and PET over Switzerland at 500 m resolution E. Rouholahnejad Freund, J. W. Kirchner, and M. Zappa https://doi.org/10.16904/envidat.145

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Short summary
Evapotranspiration (ET) rates and properties that regulate them are spatially heterogeneous. Averaging over spatial heterogeneity in precipitation (P) and potential evapotranspiration (PET) as the main drivers of ET may lead to biased estimates of energy and water fluxes from the land to the atmosphere. We show that this bias is largest in mountainous terrains, in regions with temperate climates and dry summers, and in landscapes where spatial variations in P and PET are inversely correlated.