VARIATION IN THERMODYNAMIC STRUCTURE OF PBL AS A MONSOON DEPRESSION PASSES——A CASE STUDY

Vertical profiles of virtual potential temperature,specific humidity,temperature at saturation points,moist static energies along with parcel condensing levels using minisonde data are analysed for two stations through which a monsoon depression passed.The height of the cloud base came down as low as 910 hPa level from 835 hPa.Equivalent potential temperature increased in the vertical profile as well as in the conserved variable diagram as the depression approached the station.Parcel condensing levels showed clearly inversion top and cloud top but not in all cases.Moist static energy showed an increase upto 10 kJ/kg as the depression approached.