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Estimation of Water Surface Energy Partitioning With a Conceptual Atmospheric Boundary Layer Model
Author(s) -
Liu Ziwei,
Yang Hanbo
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl092643
Subject(s) - latent heat , sensible heat , water vapor , planetary boundary layer , evaporation , humidity , environmental science , relative humidity , energy budget , energy flux , flux (metallurgy) , atmospheric sciences , boundary layer , surface energy , meteorology , vapour pressure deficit , thermodynamics , geology , physics , materials science , chemistry , astronomy , metallurgy , biochemistry , photosynthesis , transpiration
Open water surface evaporation ( E ) or the latent heat flux ( λE ) is of great importance to surface water and energy budget. However, partitioning of the available energy into sensible heat flux ( H ) and λE , quantified as the Bowen ratio ( B o ≡ H / λ E), is implicitly discrepant between models and observations. In this study, an explicit equation for the estimation of Bo (thus for the λE ) is derived based on an atmospheric boundary layer model combined with the potential vapor pressure deficit budget. Derived equation only requires the air temperature ( T a ) and specific humidity ( Q ) as inputs, and performs well in λE estimation with a relative error of <1% over observations of global sea and inland lake surfaces. More importantly, this equation clearly expresses the physical relationship between Bo and air temperature and humidity, thus revealing the mechanism of water surface energy partitioning in response to external environmental variables.