ESTIMATING SPATIAL AND TEMPORAL VARIATIONS OF LAND EVAPORATION FOR REGIONAL CLIMATE MODELING

V. A. Shutov

Approaches to estimating spatially distributed land evaporation values are considered and empirically substantiated. The model calculations are done taking into account the moisture storage—evaporation relationship and the moisture flux in the aeration zone in order to study the variations of climatic and soil moistening over the territory for three typical years. It was found that the climatic moistening characteristic (evaporation/evaporativity ratio) is more dynamic than that of soil moistening (evaporation/least moisture capacity ratio). The spatial variability of evaporation and the related surface heat flux is taken into account through spatial variability of the soil moisture storage. Nonlinearity of the relationship between evaporation and moisture storage and the spatial inhomogeneity of soil variables underestimate the calculated evaporation values.