Numerical simulation of seasonal variation of atmospheric boundary layer processes at Anand

Abstract

Seasonal variation of boundary layer processes using the intensive observational data sets during May, July, September and December, 1997 obtained under LASPEX-97 at Anand (22.4°N, 72.6°E), which represent the pre-monsoon, mansoon, post-monsoon and winter seasons respectively, are presented. For this purpose a one dimensional PBL model with one and half order TKE-epsilon (e.∈) closuro scheme incorporating interactive soil heat-moisture transportation was employed. The numerical simulations include the diurnal variations of fluxes of sensible, latent and soil hear, net radiation, soil temperatures, boundary layer height and vertical profiles of potential temperature, miximg ratio, zonal and meridional components if wind. The temporal variation of turbulent kinetic energy is also studied. The model simulations are compared with the available special observational data sets. Overall comparison showed that the model could simulate the boundary layer processes reasonably well.