Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 30, issue 15
Articles | Volume 30, issue 15
https://doi.org/10.5194/hess-30-5117-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-30-5117-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 30, issue 15
Research article
 | 
13 Aug 2026
Research article |  | 13 Aug 2026

Systematic overestimation of evapotranspiration over irrigated areas by an offline land surface model

Tanguy Lunel, Belén Martí, Aaron Boone, and Patrick Le Moigne

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Short summary
Modelling evapotranspiration is essential for understanding the water cycle. While irrigation is known to increase evapotranspiration, it is less known that it also modifies local weather, which can in turn partially reduce evapotranspiration. This latter phenomenon is overlooked in some land surface model configurations. This study investigates and quantifies the impact of this oversight, showing that land surface models overestimate evapotranspiration by about 25% for crops in irrigated areas.
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