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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/hess-2020-310
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-310
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Jul 2020

20 Jul 2020

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This preprint is currently under review for the journal HESS.

Comment on: A review of the complementary principle of evaporation: From the original linear relationship to generalized nonlinear functions by S. Han and F. Tian

Richard D. Crago1, Jozsef Szilagyi2, and Russell Qualls3 Richard D. Crago et al.
  • 1Department of Civil and Environmental Engineering, Bucknell University, Lewisburg, PA, USA
  • 2Department of Hydraulic and Water Resources Engineering, Budapest University of Technology and Economics, Budapest, Hungary; also at School of Natural Resources, University of Nebraska, Lincoln, Lincoln, NE, USA
  • 3Department of Biological Engineering, University of Idaho, Moscow, ID, USA

Abstract. The paper by Han and Tian reviews the history of developments in the complementary relationship (CR) between actual and potential evaporation and introduces the generalized complementary principle (GCP) developed by the authors. This comment assesses whether the GCP: 1) Can give reasonable results from a wide range of surfaces worldwide; 2) is supported by experimental data that verify the three-stages of evaporation implicit in the GCP, particularly in the wet-surface limit; 3) has been proven to be correct by the authors in a previous paper; and 4) is supported by model studies showing that wet surfaces occur predominantly during periods of large-scale moisture convergence. The assessment finds that arguments in favor of the GCP deserve to be taken seriously, but ultimately remain unconvincing.

Richard D. Crago et al.

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Richard D. Crago et al.

Richard D. Crago et al.

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Latest update: 25 Oct 2020
Publications Copernicus
Short summary
The sigmoid-shaped complementary relationship (CR) for regional evaporation proposed by Han and Tian (2018, 2020) is reconsidered in terms of: 1) Its ability to give reasonable evaporation results from sites worldwide; 2) evidence for the three-state evaporation process it posits; 3) the validity of the proof provided by Han and Tian (2018); and 4) the relevance of model studies that seem to support it. Arguments for the sigmoid shape deserve to be taken seriously, but remain unconvincing.
The sigmoid-shaped complementary relationship (CR) for regional evaporation proposed by Han and...
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