Evaporation and transpiration



A more complete understanding of the evaporative processes and a fund of experimental data have spurred the development of numerical modeling of the energy transfer processes in the lower atmosphere. Numerical simulation for weather forecasts and the prediction of the temperature and moisture fields require accurate prediction of each of the constituents of the energy budget. Models, though still primitive, suggest the relative importance of the input components to demonstrate the major role of the evaporation field in the development of the urban heat island [Myrup, 1969] and to emphasize the major role of positive advection in the evapotranspiration in arid and semi arid zones [Luther, 1970].