New turbulent resistance parameterization for soil evaporation based on a pore‐scale model: Impact on surface fluxes in CABLE
Open access
Date
2017-03Type
- Journal Article
Abstract
The Community Atmosphere Biosphere Land Exchange (CABLE) land surface model overestimates evapotranspiration (E) at numerous flux tower sites during boreal spring. The overestimation of E is not eliminated when the nonlinear dependence of soil evaporation on soil moisture or a simple litter layer is introduced into the model. New resistance terms, previously developed from a pore‐scale model of soil evaporation, are incorporated into the treatment of under canopy water vapor transfer in CABLE. The new resistance terms reduce the large positive bias in spring time E at multiple flux tower sites and also improve the simulation of daily sensible heat flux. The reduction in the spring E bias allows the soil to retain water into the summer, improving the seasonality of E. The simulation of daily E is largely insensitive to the details of the implementation of the pore model resistance scheme. The more physically based treatment of soil evaporation presented here eliminates the need for empirical functions that reduce evaporation as a function of soil moisture that are included in many land surface models. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000130691Publication status
publishedExternal links
Journal / series
Journal of Advances in Modeling Earth SystemsVolume
Pages / Article No.
Publisher
WileySubject
Soil evaporation; Land surface model; ParameterizationOrganisational unit
03812 - Or, Dani (emeritus) / Or, Dani (emeritus)
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