WE PROPOSE TO PROVIDE HIGH TIME RESOLUTION IN-SITU AEROSOL SIZE DISTRIBUTION MEASUREMENTS ON BOARD THE NASA P-3B AIRCRAFT FOR THE CLOUD AND AEROSOL MONSOONAL PROCESSES-PHILIPPINES EXPERIMENT (CAMP2EX) AND CONDUCT POST-MISSION DATA ANALYSES TO ADDRESS THE IMPACT OF METEOROLOGY ON THE REMOVAL AND TRANSPORT OF AEROSOL PARTICLES. CAMP2EX AIMS TO CHARACTERIZE THE ROLE OF ANTHROPOGENIC AND NATURAL AEROSOL PARTICLES IN MODULATING THE FREQUENCY AND AMOUNT OF WARM AND MIXED PHASE PRECIPITATION IN THE VICINITY OF THE PHILIPPINES DURING THE SOUTHWEST MONSOON. A UNIQUE INSTRUMENT CALLED FAST INTEGRATED MOBILITY SPECTROMETER (FIMS) WILL BE DEPLOYED TO PROVIDE 1 HZ MEASUREMENTS OF AEROSOL SIZE DISTRIBUTIONS FROM 10 TO 500 NM. THE FIMS WAS SUCCESSFULLY DEPLOYED IN SEVERAL AIRCRAFT BASED FIELD CAMPAIGNS INCLUDING A RECENT FOREIGN DEPLOYMENT IN THE CENTRAL AMAZON BASIN. GIVEN THE STRONG HETEROGENEITY IN THE AEROSOL PROPERTIES IN THE MARITIME CONTINENT THE FAST FIMS MEASUREMENTS WILL HELP ADDRESS MANY HIGH PRIORITY SCIENCE QUESTIONS OF CAMP2EX RELATING TO THE SPATIAL VARIATION OF THE AEROSOL FIELD AND ITS IMPACT ON CLOUD RADIATION AND RETRIEVALS FROM SATELLITE REMOTE SENSING. WE WILL ALSO DEVELOP ADDITIONAL DATA PRODUCTS INCLUDING HIGH RESOLUTION CCN SPECTRA AND PARTICLE HYGROSCOPICITY BY COMBINING THE AEROSOL SIZE DISTRIBUTION AND CCN MEASUREMENTS EXPECTED AS PART OF THE P-3B PAYLOAD. IN OUR POST-MISSION DATA ANALYSES WE WILL FOCUS ON THE REMOVAL OF AEROSOL ASSOCIATED WITH SQUALL LINE/COLD POOL EVENTS WHICH WE HYPOTHESIZE ARE AMONG THE MOST PROMINENT METEOROLOGICAL FEATURES THAT REGULATE THE DISTRIBUTION OF AEROSOL PARTICLES AND ULTIMATELY AEROSOL LIFECYCLE IN SOUTHEAST ASIA. WE WILL USE THE FAST FIMS MEASUREMENTS TO EXAMINE THE VARIABILITY OF THE AEROSOL SIZE DISTRIBUTION AT A RANGE OF ALTITUDES IN THE VICINITY OF CLOUDS CONVECTIVE CELLS AND COLD POOLS. THE VERTICAL AND HORIZONTAL VARIATIONS IN AEROSOLS SIZE SPECTRUM AND OTHER AVAILABLE AEROSOL PROPERTIES (E.G. PARTICLE COMPOSITION) WILL BE COMBINED WITH THE CHARACTERIZATION OF CLOUD AND PRECIPITATION FIELDS TO EXAMINE THE REMOVAL TRANSPORT AND REDISTRIBUTION OF AEROSOL DURING THESE EVENTS. THE REMOVAL AND TRANSPORT OF AEROSOL PARTICLES BY WARM CONVECTIVE SYSTEMS WILL ALSO BE EXAMINED USING MODEL SIMULATIONS CONSTRAINED BY THE OBSERVATIONS. THESE VALIDATED SIMULATIONS WILL ALLOW US TO QUANTIFY THE PROCESSES THAT CANNOT BE EASILY DONE USING THE MEASUREMENTS ALONE.