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Discussion papers
https://doi.org/10.5194/hess-2019-393
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2019-393
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 Aug 2019

Submitted as: research article | 27 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).

Evaporation from a large lowland reservoir – (dis)agreement between evaporation methods at various timescales

Femke A. Jansen and Adriaan J. Teuling Femke A. Jansen and Adriaan J. Teuling
  • Hydrology and Quantitative Water Management Group, Wageningen University, Wageningen, The Netherlands

Abstract. Accurate monitoring and prediction of surface evaporation becomes more crucial for adequate water management in a changing climate. Given the distinct differences between characteristics of a land surface and a water body, evaporation from water bodies require a different parameterization in hydrological models. Here we compare six commonly used evaporation methods that are sensitive to different drivers of evaporation, brought about by a different choice of parameterization. We characterize the (dis)agreement between the methods at various temporal scales ranging from hourly to 10-yearly periods, and we evaluate how this reflects in differences in simulated water losses through evaporation of lake IJsselmeer in The Netherlands. At smaller timescales the methods correlate less (r = 0.72) than at larger timescales (r = 0.97). The disagreement at the hourly timescale results in distinct diurnal cycles of simulated evaporation for each method. Although the methods agree more at larger timescales (i.e. yearly and 10-yearly), there are still large differences in the projected evaporation trends, showing a positive trend to a more (i.e. Penman, De Bruin–Keijman, Makkink and Hargreaves) or lesser extent (i.e. Granger–Hedstrom and FLake). The resulting discrepancy between the methods in simulated water losses of the IJsselmeer region due to evaporation is ranging from −4 mm (Granger–Hedstrom) to −94 mm (Penman) between the methods. This difference emphasizes the importance and consequence of the evaporation method selection for water managers in their decision making.

Femke A. Jansen and Adriaan J. Teuling
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Femke A. Jansen and Adriaan J. Teuling
Femke A. Jansen and Adriaan J. Teuling
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Short summary
We characterized the (dis)agreement between six evaporation methods over a range of timescales, focussing on the IJsselmeer region in The Netherlands. The projected changes of mean yearly water losses through evaporation between the years 2000 and 2100 were found to range from 4 mm to 94 mm decrease in water availability among the methods. We therefore stress that the choice of method is of great importance for water managers in their decision making.
We characterized the (dis)agreement between six evaporation methods over a range of timescales,...
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