IN RECENT YEARS THE DISCOVERY FROM NASA SATELLITE OBSERVATIONS OF AN AEROSOL LAYER IN THE ATMOSPHERE NEAR THE TROPOPAUSE REGION (13-18 KM) SPANNING A LARGE AREA FROM THE MIDDLE EAST TO EASTERN ASIA (20N-4SN 0-100E) DURING THE BOREAL SUMMER MONSOON - THE ASIAN TROPOPAUSE AEROSOL LAYER (ATAL) HAS SPARKED MUCH INTERESTS IN RESEARCH ON THE ORIGIN COMPOSITION OF THE ATAL AND ITS RELATIONSHIP TO TRANSPORT PROCESSES OF ATMOSPHERIC CONSTITUENTS IN THE UPPER TROPOSPHERE AND LOWER STRATOSPHERE (UTLS) AND THE VARIABILITY OF THE ASIAN MONSOON ANTICYCLONE (AMA). CONTEMPORANEOUSLY A LARGE BODY OF RESEARCH HAS BEEN CONDUCTED GENERATING VARIOUS HYPOTHESES E.G. THE ELEVATED HEAT PUMP (EHP) HYPOTHESIS AND OTHERS REGARDING THE ROLES OF ABSORBING AEROSOLS (DUST AND BC) IN ENHANCING MONSOON EXTREME PRECIPITATION AND DEEP CONVECTION IN NORTHERN INDIA AND THE HIMALAYAS FOOTHILLS REGION IN CONJUNCTION WITH A STRENGTHENING OF THE AMA DURING THE BOREAL SUMMER MONSOON. HOWEVER THE POSSIBLY CONNECTIONS AMONG TROPOSPHERIC AEROSOL- MONSOON INTERACTIONS EXTREME PRECIPITATION ASSOCIATED WITH DEEP CONVECTION ATMOSPHERIC CONSTITUENT TRANSPORT PROCESSES IN THE UTLS AND FORMATION OF THE ATAL HAVE NOT BEEN EXPLORED. THE MAIN OBJECTIVES OF THE PROPOSED RESEARCH ARE TO IDENTIFY AND PROVIDE BETTER FUNDAMENTAL PHYSICAL UNDERSTANDING OF A) RELATIONSHIPS BETWEEN ASIAN MONSOON VARIABILITY AND UTLS TRANSPORT PROCESSES LEADING TO THE FORMATION AND VARIABILITY OF THE ATAL AND B) HOW THESE RELATIONSHIPS MAY BE AFFECTED UNDER WARMER SEA SURFACE TEMPERATURE (SST) CONDITIONS. IN THIS STUDY WE PROPOSE TO EXAMINE THE ROLE PRE-MONSOON BUILDUP OF ABSORBING AEROSOL (DUST AND BC) ON UTLS AEROSOL-CHEMISTRY TRANSPORT PROCESSES DURING THE PEAK MONSOON SEASON FOCUSING ON THE FEEDBACK PROCESSES (EHP AND OTHERS) INDUCED BY ABSORBING AEROSOLS (DUST BC AND OC) AND OCCURRENCES OF DEEP PENETRATIVE CONVECTION EVENTS OVER NORTHEASTERN INDIA AND HIMALAYA FOOTHILLS REGION AND THEIR IMPACTS ON TRANSPORTS OF WATER VAPOR AND AEROSOL SPECIES (BC SULFATE) AND CHEMICAL GASES (MAINLY CO) TO THE UTLS REGION AND THE ATAL. INTERACTIVE EMISSION AND DYNAMICAL FEEDBACK PROCESSES ASSOCIATED WITH WINDS TEMPERATURE WATER VAPOR ABSORBING AEROSOL AND CO EMISSIONS AS A FUNCTION OF CLIMATE VARIABILITY AND CHANGE WILL ALSO BE INVESTIGATED. WE WILL USE AIRS MODIS CALIPSO/CLOUDSAT MLS AND MERRA2 DATA FOR EXPLORATION OF RELATIONSHIP AMONG AEROSOLS RAINFALL TEMPERATURE WINDS DEEP CONVECTION TROPOPAUSE HEIGHT AND UTLS TRANSPORT PROCESSES DURING THE ASIAN SUMMER MONSOON ON: A) SEASONAL TO INTRASEASONAL TIME SCALES AND B) INTERANNUAL AND LONGER TERM RELATIONSHIPS WITH SEA SURFACE TEMPERATURE VARIATIONS. NUMERICAL EXPERIMENTS WILL BE CARRIED OUT WITH THE GEOSS MODEL IN CONTROL AND RESTRAINED-PHYSICS INTEGRATIONS TO IDENTIFY THE ROLES OF AEROSOL-MONSOON INTERACTIONS UNDER PRESCRIBED PRESENT-DAY SST AND CMIPS MODEL PROJECTED GLOBAL WARMING SST. MODEL RESULTS WILL BE VALIDATED AGAINST THE AFOREMENTIONED SATELLITE OBSERVATIONS AND MERRA2 REANALYSIS. THE PROPOSED RESEARCH IS RELEVANT PRIMARILY TO THE MAP RESEARCH THEME UNDER CONSTITUENTS IN THE CLIMATE SYSTEM AND SECONDARILY TO TWO OTHER THEMES CLOUDS IN THE CLIMATE MODELS AND COUPLING IN THE EARTH SYSTEM