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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 1
Hydrol. Earth Syst. Sci., 21, 217–233, 2017
https://doi.org/10.5194/hess-21-217-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 21, 217–233, 2017
https://doi.org/10.5194/hess-21-217-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Jan 2017

Research article | 11 Jan 2017

A Budyko framework for estimating how spatial heterogeneity and lateral moisture redistribution affect average evapotranspiration rates as seen from the atmosphere

Elham Rouholahnejad Freund and James W. Kirchner
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Revised manuscript under review for HESS
Short summary
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Cited articles  
Bacmeister, J. T., Wehner, M. F., Neale, R. B., Gettelman, A., Hannay, C., Lauritzen, P. H., Caron, J. M., and Truesdale, J. E.: Exploratory High-Resolution Climate Simulations using the Community Atmosphere Model (CAM), J. Climate, 27, 3073–3099, https://doi.org/10.1175/JCLI-D-13-00387.1, 2014.
Bagrov, N. A.: Mean long-term evaporation from land surface, Meteorol. Gidrol., 10, 20–25, 1953.
Beven, K.: Linking parameters across scales: Subgrid parameterizations and scale dependent hydrological models, Hydrol. Process., 9, 507–525, https://doi.org/10.1002/hyp.3360090504, 1995.
Boyle, J. and Klein, S. A.: Impact of horizontal resolution on climate model forecasts of tropical precipitation and diabatic heating for the TWP-ICE period, J. Geophys. Res.-Atmos., 115, D23113, https://doi.org/10.1029/2010JD014262, 2010.
Budyko, M. l.: Climate and life, Academic, New York, 1974.
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Our analysis shows that averaging over sub-grid heterogeneity in precipitation and potential evapotranspiration (ET), as typical earth system models do, overestimates the average of the spatially variable ET. We also show when aridity index increases with altitude, lateral redistribution would transfer water from more humid uplands to more arid lowlands, resulting in a net increase in ET. Therefore, the Earth system models that neglect lateral transfer underestimate ET in those regions.
Our analysis shows that averaging over sub-grid heterogeneity in precipitation and potential...
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