THE PRINCIPLE SCIENTIFIC OBJECTIVE OF THE CLOUD AND AEROSOL MONSOONAL PROCESSES-PHILIPPINES EXPERIMENT (CAMP2EX) IS TO CREATE A PHYSICAL DESCRIPTION OF THE TIME-VARYING PROPERTIES OF SHALLOW AND CUMULUS CONGESTUS CLOUDS ACROSS A CONTINUUM OF DYNAMICAL STATES RANGING FROM BACKGROUND PRISTINE TO PERTURBED AEROSOL CONDITIONS. THE INFLUENCES OF AEROSOL ON CLOUD PROCESSES AND LIFETIME IN THIS REGION INCLUDE A NUMBER OF COMPETING AND CO-VARYING EFFECTS BUT MOST OF THESE BEGIN WITH THE MANNER BY WHICH AEROSOL-MODULATED DROPLET NUMBER MODIFIES THE INITIAL CREATION OF PRECIPITATION WITHIN A CLOUD UPDRAFT. THESE CHANGES RESULT IN A CASCADE OF PHENOMENA THAT DEPEND IN THEIR DETAILS ON THE MESO- AND LARGER-SCALE ENVIRONMENTS WE AIM TO ADDRESS ONE OF THE PRINCIPAL CHALLENGES OF CAMP2EX. IN ORDER TO CHARACTERIZE THE INFLUENCE OF AEROSOL ON CLOUD MICROPHYSICS IT IS NECESSARY TO CHARACTERIZE SIMULTANEOUSLY BOTH THE CLOUD AND PRECIPITATION MICROPHYSICS AS WELL AS THE DYNAMICAL ENVIRONMENT IN THE VERTICAL COLUMN WITHIN WHICH THESE HYDROMETEOR POPULATIONS ARE EVOLVING. THIS PROPOSED PROJECT SPECIFICALLY TAKES A SYNERGISTIC APPROACH TO THIS PROBLEM USING ACTIVE MULTI-FREQUENCY DOPPLER RADAR COMBINED WITH PASSIVE MICROWAVE BRIGHTNESS TEMPERATURE MEASUREMENTS. WE DEMONSTRATE THAT THIS SYNERGY ALLOWS US TO CHARACTERIZE THE MICROPHYSICAL AND DYNAMICAL PROPERTIES OF THE CONGESTUS CLOUDS THAT ARE SPECIFICALLY RELEVANT TO THE CLOUD-AEROSOL INTERACTION PROBLEM. WE PROPOSE DEPLOYMENT OF THE JET PROPULSION LABORATORY AIRBORNE PRECIPITATION AND CLOUD RADAR 3RD GENERATION (APR-3) AND THE NASA MARSHALL ADVANCED MICROWAVE PRECIPITATION RADIOMETER (AMPR). IN ADDITION WE PROPOSE TO TAKE THE BASIC MEASUREMENTS FROM THESE INSTRUMENTS AND PRODUCE USING ADVANCED ALGORITHMS A LEVEL-2 DATA PRODUCT DESCRIBING THE SIMULTANEOUS CLOUD AND PRECIPITATION STRUCTURE MICROPHYSICS AND THE TURBULENT VERTICAL AND HORIZONTAL AIR MOTIONS IN AND NEAR THE CLOUD SYSTEMS BEING STUDIED. THIS DATA SET WILL THEN BE USED TO EVALUATE SEVERAL SCIENCE QUESTIONS THAT ADDRESS THE AEROSOL-CLOUD-PRECIPITATION INTERACTION QUESTION. SPECIFICALLY 1) CAN WE IDENTIFY A TENDENCY FOR PRECIPITATION DROPLET SIZES TO BE LARGER BUT LESS NUMEROUS IN CLOUDS WITH HIGHER DROPLET NUMBER THAT ARE PRESUMABLY FORMING IN MORE POLLUTED AIR MASSES? 2) IS THERE A TENDENCY FOR CONGESTUS CLOUDS FORMING WITH HIGHER DROPLET NUMBER TO BECOME DEEPER CARRYING THEIR CONDENSATE HIGHER INTO THE ATMOSPHERE? 3) IS PRECIPITATION EVAPORATION BELOW CLOUD BASE WEAKER IN AEROSOL MODIFIED CLOUDS THAT THEN RESULT IN WEAKER COLD POOLS? AS DESCRIBED IN THE PROPOSAL THE OBJECTIVES OF CAMP2EX ARE SUCH THAT NO SINGLE INSTRUMENT WORKING ALONE CAN BE SUCCESSFUL. THEREFORE WE VIEW THE COMBINATION OF THE APR3 AND AMPR AS COMPOSING A MINIMAL SINGLE OBSERVATIONAL SYSTEM IN REGARDS TO THE CLOUD AND PRECIPITATION REMOTE SENSING ELEMENT WITH THE RESULTING LEVEL-2 DATA PRODUCTS BEING THE NECESSARY AND MOST BASIC PRODUCT OF THIS MEASUREMENT SYSTEM.