WE PROPOSE TO MEASURE SPECTRALLY RESOLVED SHORTWAVE IRRADIANCE WITH THE SOLAR SPECTRAL FLUX RADIOMETER (SSFR) ONBOARD THE NASA P-3B IN SUPPORT OF THE CLOUD AND AEROSOL MONSOONAL PROCESSES PHILIPPINES EXPERIMENT (CAMP2EX). THESE MEASUREMENTS ARE NECESSARY TO ADDRESS SEVERAL MISSION OBJECTIVES AND SCIENCE QUESTIONS AS OUTLINED IN THE PLANNING DOCUMENT AND IN THE SOLICITATION IN PARTICULAR THE ATMOSPHERIC RADIATIVE/HEAT BUDGET OF AEROSOLS AND AEROSOL-INDUCED CHANGES IN CLOUD PROPERTIES. SOLAR FLUXES ARE A PRIORITY-1 REQUIREMENT OF THE PLANNING DOCUMENT. THE ATMOSPHERIC RADIATION GROUP (ARG) AT THE UNIVERSITY OF COLORADO HAS DEVELOPED AN APPROACH TO SEPARATE THE EFFECTS OF AEROSOLS FROM THOSE OF WATER VAPOR AND OTHER ATMOSPHERIC GASES RELYING ON THE SPECTRAL RESOLUTION OF THE SSFR INSTRUMENT WHICH WILL BE APPLIED TO CAMP2EX DATA. WE HAVE ALSO DEVELOPED SEVERAL TECHNIQUES TO SAMPLE AND ANALYZE RADIATION MEASUREMENTS FOR SPATIALLY COMPLEX SCENES WHICH TRADITIONALLY POSE A SIGNIFICANT CHALLENGE FOR DERIVING AEROSOL AND WATER VAPOR HEATING RATES IN PARTIALLY CLOUDY SCENES. DEVELOPED OVER THE YEARS FOR A RANGE OF CONDITIONS AND AIRCRAFT/ PAYLOAD CONSTELLATIONS THESE TECHNIQUES RELY ON THREE-DIMENSIONAL (3D) RADIATIVE TRANSFER CALCULATIONS ON THE BASIS OF CLOUD-AEROSOL FIELDS THAT ARE DERIVED FROM ACTIVE/PASSIVE REMOTE SENSORS ONBOARD THE P-3B IN-SITU CLOUD/AEROSOL MICROPHYSICS MEASUREMENTS COUPLED WITH A STATISTICAL CLOUD GENERATOR LARGE-EDDY SIMULATIONS (LES) OR GEOSTATIONARY CLOUD RETRIEVALS. DEPENDING ON WHICH OBSERVATIONS ARE AVAILABLE FOR CAMP2EX ONE OR SEVERAL OF THESE TECHNIQUES WILL BE APPLIED TO OBTAIN AEROSOL-CLOUD RADIATIVE EFFECTS SUCH AS HEATING RATES FROM THE COMBINED OBSERVATIONS. IN ADDITION THE 3D CALCULATIONS WILL BE APPLIED TO DETERMINE REMOTE SENSING BIASES IN CLOUD AND AEROSOLS THAT ARE DUE TO CLOUD INHOMOGENEITY CONTINUING THE GROUP S WORK ON SEAC4RS AND TC4 DATA FOR A DIFFERENT REGION OF THE GLOBE. THE PHILIPPINES EXPERIMENT IS PARTICULARLY WELL SUITED TO THE GROUP S ABILITY TO ISOLATE THE AEROSOL RADIATIVE EFFECT EVEN IN THE PRESENCE OF INHOMOGENEOUS CLOUDS A NEW CAPABILITY RECENTLY ESTABLISHED BY ADDING AN ACTIVE LEVELING PLATFORM (ALP) TO SSFR. ALP KEEPS THE OPTICAL INLET OF THE RADIOMETER HORIZONTALLY ALIGNED BY COUNTERACTING CHANGES OF THE AIRCRAFT S ATTITUDE. IN THIS WAY EVEN SPIRAL DATA CAN BE USED TO DETERMINE PROFILES OF SPECTRAL NET FLUX AN INDISPENSIBLE REQUIREMENT IN SPATIALLY INHOMOGENEOUS ENVIRONMENTS. THE COMBINED SSFR/ALP SYSTEM HAS BEEN TESTED DURING THE ORACLES MISSION AND THE SYSTEM IS PROPOSED FOR CAMP2EX WITH MINOR MODIFICATIONS. THE MAIN WORK EFFORT IS REQUIRED FOR THE ANALYSIS OF THE DATA WHICH RELIES ON INTERPRETIVE 3D MODELING ON A SCENE-BY-SCENE BASIS. THIS WORK HAS BEEN DONE SUCCESSFULLY FOR MULTIPLE CASES FROM SEVERAL FIELD MISSIONS REVEALING UNEXPECTED LINKAGES BETWEEN CLOUD-AEROSOL REMOTE SENSING RADIATIVE EFFECTS IN THE LAYER AND AT THE SURFACE AND DIFFERENT BIASES IN ALL OF THESE QUANTITIES FOR CLOUD SCENES WITH VARYING DEGREE OF INHOMOGENEITY. AS IN AN EARLIER COLLABORATION BETWEEN ARG AND CO-I FEINGOLD LES WILL BE USED TO GENERATE REALISTIC PROXY CLOUD FIELDS TO SUPPORT EXPERIMENT AND FLIGHT PLANNING AS WELL AS CAMP2EX SPECIFIC SCENES TO SUPPORT INTERPRETIVE ANALYSIS AS DESCRIBED ABOVE. CAMP2EX DATA WILL BE INVALUABLE FOR UNDERSTANDING AEROSOL-CLOUD-RADIATIVE INTERACTIONS IN ONE OF THE MOST COMPLEX REGIONS OF THE WORLD AND WE EXPECT THAT OUR FINDINGS WILL HAVE REPERCUSSIONS ON THE REMOTE SENSING OF CLOUD-AEROSOL RADIATIVE EFFECTS FROM EXISTING AND FUTURE SPACEBORNE INSTRUMENTS.