A comparative analysis of the characteristics of the Marine Boundary Layerwith GCM and 1-D PBL model simulations using INDOEX IFP-99 data

Glass-sonde observations consisting of wind, temperature and relative humid ity at different pressure levels that were obtained on board ORV Sagar Kany a cruise #141 (INDOEX IFP-99), during winter monsoon of 1999 were used for the present study. An attempt has been made to compare the simulation of ti re evolution of the Marine Boundary Layer as obtained from the one-dimensio nal PBL model of IIT Delhi, having TKE-epsilon closure scheme with that obt ained from the GCM of NCMRWF having first order closure scheme. Simulation of various boundary layer characteristics including surface and upper air h as been studied. The model simulations are compared with the available obse rvations. Both the models simulated the vertical profiles reasonably well c ompared with the observations.