Articles | Volume 24, issue 10
https://doi.org/10.5194/hess-24-5015-2020
https://doi.org/10.5194/hess-24-5015-2020
Research article
 | 
28 Oct 2020
Research article |  | 28 Oct 2020

Averaging over spatiotemporal heterogeneity substantially biases evapotranspiration rates in a mechanistic large-scale land evaporation model

Elham Rouholahnejad Freund, Massimiliano Zappa, and James W. Kirchner

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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (further review by editor) (25 Jun 2020) by Anke Hildebrandt
AR by Elham R. Freund on behalf of the Authors (30 Jul 2020)
ED: Publish subject to minor revisions (review by editor) (25 Aug 2020) by Anke Hildebrandt
AR by Elham R. Freund on behalf of the Authors (31 Aug 2020)
ED: Publish as is (10 Sep 2020) by Anke Hildebrandt
AR by Elham R. Freund on behalf of the Authors (19 Sep 2020)  Manuscript 
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Short summary
Evapotranspiration (ET) is the largest flux from the land to the atmosphere and thus contributes to Earth's energy and water balance. Due to its impact on atmospheric dynamics, ET is a key driver of droughts and heatwaves. In this paper, we demonstrate how averaging over land surface heterogeneity contributes to substantial overestimates of ET fluxes. We also demonstrate how one can correct for the effects of small-scale heterogeneity without explicitly representing it in land surface models.