NUMERICAL EXPERIMENTS ON THE EFFECT OF INDIAN SUBCONTINENT VEGETATION COVER ON SUMMER MONSOON

In the present paper,a global two-dimensional climate model developed by Chinese Academy of Meteorological Sciences (CAMS) with inclusion of a simple parameterization of land surface processes developed recently by Zhang and Li is used to investigate the effect of vegetation cover of the Indian subcontinent on summer monsoon circulation and its rainfall.First of all,we carried out a control experiment in which the distribution of vegetation species was based on obser-vations.Then,with removal of the vegetation cover on the subcontinent,a sensitivity experiment was performed.For both of the experiments,the integrations were made from the beginning of April to the end of July.The results show that,after the vegetation was removed from the subcontinent,the monthly mean updraft and the monsoon circulation to the south of the Plateau was weakened in June and July.Especially,the change was more manifest in June.Also,in the south side of the Plateau,the easterly component was strengthened in the lower troposphere,the monsoon rainfall was reduced over the central India.Moreover,the rainfall was obviously reduced over the southern India from the end of June to the beginning of July.