AN ADVECTION-ARIDITY EVAPORATION MODEL

Actual evaporation is calculated by means of an advection-aridity complementary model which requires, as input, the meteorological data used in classical combination models. The main advantage of the model is that it does not require site-specific calibration. The advection-aridity formulation presented here includes the effect of atmospheric stability, which can be important to describe the diurnal evaporation variation, and a theoretical model of the scalar roughness height. A parameterization for advection over the surface of interest is incorporated which allows the model to be used for a wide range of natural conditions. The model was found to give good agreement with evaporation measurements obtained with a large sensitive lysimeter over a bare soil field.