Precipitation; velocity potential; biosphere-atmosphere interaction; atmospheric general circulation
Two simulations of atmospheric circulations dunng June, July and August 1988 have been made
with LMD Atmospheric General Circulation Model using a classified vegetatmn global cover with and
without the tropical vegetation separately. The initial conditmns prepared from ECMWF analysed data were used, while the Reynolds' monthly blended analysis, i e., the blend of in situ, AVHRR satellite and ice data, were taken to prescribe the sea surface temperatures. The global charts of mean monthly precipitation
and assocmted velocRy potentmls at 200 and 850 mb have been compared and analysed for June, July and
August 1988. The temporal evolutmns of precipitation averaged over a specific region of Indian summer monsoon during its regime from onset to retreat have also been discussed. Consequently, a pronounced impact of tropical vegetation on the precipitation has been observed so as to characterise a forest as one of
the local rain inducing agents. Moreover, the tropical vegetation appears to modulate the Indian summer monsoon also for the contributive preopitatlon over India.