Articles | Volume 25, issue 1
04 Jan 2021
Comment/reply |  | 04 Jan 2021

Comment on: “A review of the complementary principle of evaporation: from the original linear relationship to generalized nonlinear functions” by Han and Tian (2020)

Richard D. Crago, Jozsef Szilagyi, and Russell Qualls

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Cited articles

Bouchet, R.: Epototranspiration reelle et potentielle, signification climatique, Int. Assoc. Hydrolog. Sci. Publ., 62, 134–142, 1963. 
Brutsaert, W.: Evaporation into the Atmosphere: Theory, History, and Applications, Springer, Dordrecht, The Netherlands, 1982. 
Brutsaert, W.:Hydrology, An Introduction, Cambridge University Press, New York, NY, USA, 2005. 
Brutsaert, W.: A generalized complementary principle with physical constraints for landsurface evaporation, Water Resour. Res., 51, 8087–8093,, 2015. 
Crago, R., Szilagyi, J., Qualls, R., and Huntington, J. L.: Rescaling the complementary relationship for land surface evaporation, Water Resour. Res., 52, 8461–8470,, 2016. 
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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.