The Modeling of the Atmospheric Boundary Layer over Inhomogeneously Moistened Surface as a Tool for Evapotranspiration Estimation

E. D. Nadezhina, I. M. Shkol’nik, A. V. Sternzat, A. A. Pikaleva,
and B. N. Egorov

The skills of a method to estimate evapotranspiration from a heterogeneous surface, including irrigated lands, based on the quantitative description of the deformation of vertical distributions of specific humidity at the windward and leeward boundaries of the site are considered in the framework of numerical regional climate modeling and a detailed description of the atmospheric boundary layer evolution. It is shown that the average values of evapotranspiration from a heterogeneous surface are mainly determined by the area of irrigated fields and do not almost depend on the number and size of inhomogeneities. Based on numerical experiments, we analyzed the wind speed effect on the spatial distribution of evapotranspiration in arid regions, including irrigated lands.