5 IMPROVING UNDERSTANDING AND MODELING CAPABILITY OF THE IMPACT OF TROPOSPHERIC AEROSOLS ON ACTINIC FLUXES OVER THE YEARS, THE CAFS INSTRUMENTS HAVE ACQUIRED A RICH DATA SET OF SPECTRAL ACTINIC FLUXES. SOME DATA FROM INDIVIDUAL FIELD CAMPAIGNS (SEE TABLE 1) HAVE BEEN PREVIOUSLY ANALYZED (ADHIKARY ET AL. 2010PALANCAR ET AL. 2012 CORR ET AL. 2012). IN ORDER TO MAKE THE BEST USE OF OBSERVATIONAL DATA, WE PROPOSE TO DEVELOP A HARMONIZED DATA SET, CALLED AEROSOL ATTENUATED ACTINIC FLUX (AAAF), BY INTEGRATING HIGHQUALITY CAFS DATA OF ACTINIC FLUX SPECTRA AND J-VALUES REPRESENTATIVE OF DIFFERENT AEROSOL-LADEN CONDITIONS. AAAF WILL ALSO INCLUDE SPECTRAL AEROSOL OPTICAL MODELS THAT WILL BE DEVELOPED UNDER THIS PROPOSAL, AS WELL AS AUXILIARY DATA (E.G., SUN POSITION, ALTITUDE, SURFACE ALBEDO, OZONE, ETC.) NEEDED BY RADIATIVE TRANSFER MODELS FOR CALCULATIONS OF OBSERVED ACTINIC FLUX SPECTRA. INITIALLY, WE WILL PERFORM AN IN-DEPTH STATISTICAL ANALYSIS OF CAFS SPECTRAL ACTINIC FLUXES MEASURED DURING INDIVIDUAL FIELD CAMPAIGNS LISTED IN TABLE 1. THE PURPOSE OF THIS ANALYSIS IS TWO-FOLD. FOR ONE, THE ANALYSIS WILL BE AIMED AT OBSERVATIONALLY IDENTIFYING AND CHARACTERIZING THE MAJOR FEATURES IN ACTINIC FLUX SPECTRA SPECIFIC TO CERTAIN AEROSOL TYPES. FOR EXAMPLE, THE PRELIMINARY ANALYSES OF THE CAFS MEASUREMENTS TAKEN ON APRIL 12, 2008 DURING THE ARCTAS MISSION REVEAL SIGNIFICANT VARIABILITY. FIGURE 3 SHOWS PHOTOLYSIS RATES OF OZONE (JO3) WITH TIME (UT). THE CHANGES IN JO3 ARE CAUSED BY CHANGES IN ELEVATION OF SUN(INCREASING SZA), ALTITUDE OF THE AIRCRAFT AND GEO-LOCATION OF THE AIRCRAFT (OVERHEAD OZONE AND TEMPERATURE VARIABILITY). PHOTOLYSIS RATES SHOWN IN FIG. 3 ARE BASED ON MEASUREMENTS OF ACTINIC FLUX DATA BY THE UPWARD LOOKING (BLUE) AND NADIR LOOKING (YELLOW) INSTRUMENTS, AND RESULTS FROM THE COMBINED MEASUREMENTS (RED). MEASURED PHOTOLYSIS RATES ARE COMPARED AGAINST THE TUV SIMULATED RESULTS (BLACK LINES) FOR CHANGES IN SOLAR ZENITH ANGLE, TOTAL OZONE COLUMNS INTERPOLATED FROM OMI SATELLITE DATA TO MATCH AIRCRAFT GEO-LOCATION, DEFAULT POLLUTION AEROSOL LOAD AND 0.9 SURFACE ALBEDO. FIGURE 4 SHOWS ADDITIONAL INSITU AEROSOL INFORMATION FOUND IN THE LARGE DATASET (PI B. ANDERSON). IT INCLUDES MEASUREMENTS BY TSI AND RR NEPHELOMETERS AT SEVERAL SPECTRAL CHANNELS. THE ABSORPTION AT THE 532 NM CHANNEL AND ANGSTROM PARAMETER ARE PLOTTED AS FUNCTION OF TIME. CHANGES IN THE ALTITUDE OF THE AIRCRAFT INDICATE PERIODS OF AEROSOLS MEASURED NEAR THE SURFACE AND ALOFT. LARGE DIFFERENCE BETWEEN MEASURED AND PREDICTED PHOTOLYSIS RATES DURING 18 AND 19 UT INDICATE THE EFFECT OF UNDERLYING CLOUDS THAT ARE NOT TAKEN INTO ACCOUNT IN TUV SETTINGS. PERIODS OF THE ASIAN POLLUTION LAYER SAMPLED BY THE AIRCRAFT DURING THE ARCTAS OVER ALASKA ARE CLEARLY INDICATED BY ELEVATED ABSORPTION AT 532 NM AND BY CHANGES IN THE ANGSTROM COEFFICIENT. Funding Only Action ($1) 9/18/20 Not listed IMPROVING UNDERSTANDING AND MODELING CAPABILITY OF THE IMPACT OF TROPOSPHERIC AEROSOLS ON ACTINIC FLUXESOVER THE YEARS THE CAFS INSTRUMENTS HAVE ACQUIRED A RICH DATA SET OF SPECTRAL ACTINIC FLUXES. SOME DATA FROM INDIVIDUAL FIELD CAMPAIGNS (SEE TABLE 1) HAVE BEEN PREVIOUSLY ANALYZED (ADHIKARY ET AL. 2010PALANCAR ET AL. 2012 CORR ET AL. 2012). IN ORDER TO MAKE THE BEST USE OF OBSERVATIONAL DATA WE PROPOSE TO DEVELOP A HARMONIZED DATA SET CALLED AEROSOL ATTENUATED ACTINIC FLUX (AAAF) BY INTEGRATING HIGHQUALITY CAFS DATA OF ACTINIC FLUX SPECTRA AND J-VALUES REPRESENTATIVE OF DIFFERENT AEROSOL-LADEN CONDITIONS. AAAF WILL ALSO INCLUDE SPECTRAL AEROSOL OPTICAL MODELS THAT WILL BE DEVELOPED UNDER THIS PROPOSAL AS WELLAS AUXILIARY DATA (E.G. SUN POSITION ALTITUDE SURFACE ALBEDO OZONE ETC.) NEEDED BY RADIATIVE TRANSFER MODELS FOR CALCULATIONS OF OBSERVED ACTINIC FLUX SPECTRA. INITIALLY WE WILL PERFORM AN IN-DEPTH STATISTICAL ANALYSIS OF CAFS SPECTRAL ACTINIC FLUXES MEASURED DURING INDIVIDUAL FIELD CAMPAIGNS LISTED IN TABLE 1. THE PURPOSE OF THIS ANALYSIS IS TWO-FOLD. FOR ONE THE ANALYSIS WILL BE AIMED AT OBSERVATIONALLY IDENTIFYING AND CHARACTERIZING THE MAJOR FEATURES IN ACTINIC FLUX SPECTRA SPECIFIC TO CERTAIN AEROSOL TYPES. FOR EXAMPLE THE PRELIMINARY ANALYSES OF THE CAFS MEASUREMENTS TAKEN ON APRIL 12 2008 DURING THE ARCTAS MISSION REVEAL SIGNIFICANT VARIABILITY. FIGURE 3 SHOWS PHOTOLYSIS RATES OF OZONE (JO3) WITH TIME (UT). THE CHANGES IN JO3 ARE CAUSED BY CHANGES IN ELEVATION OF SUN(INCREASING SZA) ALTITUDE OF THE AIRCRAFT AND GEO-LOCATION OF THE AIRCRAFT (OVERHEAD OZONE AND TEMPERATURE VARIABILITY). PHOTOLYSIS RATES SHOWN IN FIG. 3 ARE BASED ON MEASUREMENTS OF ACTINIC FLUX DATA BY THE UPWARD LOOKING (BLUE) AND NADIR LOOKING (YELLOW) INSTRUMENTS AND RESULTS FROM THE COMBINED MEASUREMENTS (RED). MEASURED PHOTOLYSIS RATES ARE COMPARED AGAINST THE TUV SIMULATED RESULTS (BLACK LINES) FOR CHANGES IN SOLAR ZENITH ANGLE TOTAL OZONE COLUMNS INTERPOLATED FROM OMI SATELLITE DATA TO MATCH AIRCRAFT GEO-LOCATION DEFAULT POLLUTION AEROSOL LOAD AND 0.9 SURFACE ALBEDO. FIGURE 4 SHOWS ADDITIONAL INSITU AEROSOL INFORMATION FOUND IN THE LARGE DATASET (PI B. ANDERSON). IT INCLUDES MEASUREMENTS BY TSI AND RR NEPHELOMETERS AT SEVERAL SPECTRAL CHANNELS. THE ABSORPTION AT THE 532 NM CHANNEL AND ANGSTROM PARAMETER ARE PLOTTED AS FUNCTION OF TIME. CHANGES IN THE ALTITUDE OF THE AIRCRAFT INDICATE PERIODS OF AEROSOLS MEASURED NEAR THE SURFACE AND ALOFT. LARGE DIFFERENCE BETWEEN MEASURED AND PREDICTED PHOTOLYSIS RATES DURING 18 AND 19 UT INDICATE THE EFFECT OF UNDERLYING CLOUDS THAT ARE NOT TAKEN INTO ACCOUNT IN TUV SETTINGS. PERIODS OF THE ASIAN POLLUTION LAYER SAMPLED BY THE AIRCRAFT DURING THE ARCTAS OVER ALASKA ARE CLEARLY INDICATED BY ELEVATED ABSORPTION AT 532 NM AND BY CHANGES IN THE ANGSTROM COEFFICIENT. ($1) 9/18/20 Not listed IMPROVING UNDERSTANDING AND MODELING CAPABILITY OF THE IMPACT OF TROPOSPHERIC AEROSOLS ON ACTINIC FLUXESOVER THE YEARS THE CAFS INSTRUMENTS HAVE ACQUIRED A RICH DATA SET OF SPECTRAL ACTINIC FLUXES. SOME DATA FROM INDIVIDUAL FIELD CAMPAIGNS (SEE TABLE 1) HAVE BEEN PREVIOUSLY ANALYZED (ADHIKARY ET AL. 2010;PALANCAR ET AL. 2012; CORR ET AL. 2012). IN ORDER TO MAKE THE BEST USE OF OBSERVATIONAL DATA WE PROPOSE TO DEVELOP A HARMONIZED DATA SET CALLED AEROSOL ATTENUATED ACTINIC FLUX (AAAF) BY INTEGRATING HIGHQUALITY CAFS DATA OF ACTINIC FLUX SPECTRA AND J-VALUES REPRESENTATIVE OF DIFFERENT AEROSOL-LADEN CONDITIONS. AAAF WILL ALSO INCLUDE SPECTRAL AEROSOL OPTICAL MODELS THAT WILL BE DEVELOPED UNDER THIS PROPOSAL AS WELLAS AUXILIARY DATA (E.G. SUN POSITION ALTITUDE SURFACE ALBEDO OZONE ETC.) NEEDED BY RADIATIVE TRANSFER MODELS FOR CALCULATIONS OF OBSERVED ACTINIC FLUX SPECTRA. INITIALLY WE WILL PERFORM AN IN-DEPTH STATISTICAL ANALYSIS OF CAFS SPECTRAL ACTINIC FLUXES MEASURED DURING INDIVIDUAL FIELD CAMPAIGNS LISTED IN TABLE 1. THE PURPOSE OF THIS ANALYSIS IS TWO-FOLD. FOR ONE THE ANALYSIS WILL BE AIMED AT OBSERVATIONALLY IDENTIFYING AND CHARACTERIZING THE MAJOR FEATURES IN ACTINIC FLUX SPECTRA SPECIFIC TO CERTAIN AEROSOL TYPES. FOR EXAMPLE THE PRELIMINARY ANALYSES OF THE CAFS MEASUREMENTS TAKEN ON APRIL 12 2008 DURING THE ARCTAS MISSION REVEAL SIGNIFICANT VARIABILITY. FIGURE 3 SHOWS PHOTOLYSIS RATES OF OZONE (JO3) WITH TIME (UT). THE CHANGES IN JO3 ARE CAUSED BY CHANGES IN ELEVATION OF SUN(INCREASING SZA) ALTITUDE OF THE AIRCRAFT AND GEO-LOCATION OF THE AIRCRAFT (OVERHEAD OZONE AND TEMPERATURE VARIABILITY). PHOTOLYSIS RATES SHOWN IN FIG. 3 ARE BASED ON MEASUREMENTS OF ACTINIC FLUX DATA BY THE UPWARD LOOKING (BLUE) AND NADIR LOOKING (YELLOW) INSTRUMENTS AND RESULTS FROM THE COMBINED MEASUREMENTS (RED). MEASURED PHOTOLYSIS RATES ARE COMPARED AGAINST THE TUV SIMULATED RESULTS (BLACK LINES) FOR CHANGES IN SOLAR ZENITH ANGLE TOTAL OZONE COLUMNS INTERPOLATED FROM OMI SATELLITE DATA TO MATCH AIRCRAFT GEO-LOCATION DEFAULT POLLUTION AEROSOL LOAD AND 0.9 SURFACE ALBEDO. FIGURE 4 SHOWS ADDITIONAL INSITU AEROSOL INFORMATION FOUND IN THE LARGE DATASET (PI B. ANDERSON). IT INCLUDES MEASUREMENTS BY TSI AND RR NEPHELOMETERS AT SEVERAL SPECTRAL CHANNELS. THE ABSORPTION AT THE 532 NM CHANNEL AND ANGSTROM PARAMETER ARE PLOTTED AS FUNCTION OF TIME. CHANGES IN THE ALTITUDE OF THE AIRCRAFT INDICATE PERIODS OF AEROSOLS MEASURED NEAR THE SURFACE AND ALOFT. LARGE DIFFERENCE BETWEEN MEASURED AND PREDICTED PHOTOLYSIS RATES DURING 18 AND 19 UT INDICATE THE EFFECT OF UNDERLYING CLOUDS THAT ARE NOT TAKEN INTO ACCOUNT IN TUV SETTINGS. PERIODS OF THE ASIAN POLLUTION LAYER SAMPLED BY THE AIRCRAFT DURING THE ARCTAS OVER ALASKA ARE CLEARLY INDICATED BY ELEVATED ABSORPTION AT 532 NM AND BY CHANGES IN THE ANGSTROM COEFFICIENT. $0 5/15/19 4 IMPROVING UNDERSTANDING AND MODELING CAPABILITY OF THE IMPACT OF TROPOSPHERIC AEROSOLS ON ACTINIC FLUXES OVER THE YEARS, THE CAFS INSTRUMENTS HAVE ACQUIRED A RICH DATA SET OF SPECTRAL ACTINIC FLUXES. SOME DATA FROM INDIVIDUAL FIELD CAMPAIGNS (SEE TABLE 1) HAVE BEEN PREVIOUSLY ANALYZED (ADHIKARY ET AL. 2010;PALANCAR ET AL. 2012; CORR ET AL. 2012). IN ORDER TO MAKE THE BEST USE OF OBSERVATIONAL DATA, WE PROPOSE TO DEVELOP A HARMONIZED DATA SET, CALLED AEROSOL ATTENUATED ACTINIC FLUX (AAAF), BY INTEGRATING HIGHQUALITY CAFS DATA OF ACTINIC FLUX SPECTRA AND J-VALUES REPRESENTATIVE OF DIFFERENT AEROSOL-LADEN CONDITIONS. AAAF WILL ALSO INCLUDE SPECTRAL AEROSOL OPTICAL MODELS THAT WILL BE DEVELOPED UNDER THIS PROPOSAL, AS WELL AS AUXILIARY DATA (E.G., SUN POSITION, ALTITUDE, SURFACE ALBEDO, OZONE, ETC.) NEEDED BY RADIATIVE TRANSFER MODELS FOR CALCULATIONS OF OBSERVED ACTINIC FLUX SPECTRA. INITIALLY, WE WILL PERFORM AN IN-DEPTH STATISTICAL ANALYSIS OF CAFS SPECTRAL ACTINIC FLUXES MEASURED DURING INDIVIDUAL FIELD CAMPAIGNS LISTED IN TABLE 1. THE PURPOSE OF THIS ANALYSIS IS TWO-FOLD. FOR ONE, THE ANALYSIS WILL BE AIMED AT OBSERVATIONALLY IDENTIFYING AND CHARACTERIZING THE MAJOR FEATURES IN ACTINIC FLUX SPECTRA SPECIFIC TO CERTAIN AEROSOL TYPES. FOR EXAMPLE, THE PRELIMINARY ANALYSES OF THE CAFS MEASUREMENTS TAKEN ON APRIL 12, 2008 DURING THE ARCTAS MISSION REVEAL SIGNIFICANT VARIABILITY. FIGURE 3 SHOWS PHOTOLYSIS RATES OF OZONE (JO3) WITH TIME (UT). THE CHANGES IN JO3 ARE CAUSED BY CHANGES IN ELEVATION OF SUN(INCREASING SZA), ALTITUDE OF THE AIRCRAFT AND GEO-LOCATION OF THE AIRCRAFT (OVERHEAD OZONE AND TEMPERATURE VARIABILITY). PHOTOLYSIS RATES SHOWN IN FIG. 3 ARE BASED ON MEASUREMENTS OF ACTINIC FLUX DATA BY THE UPWARD LOOKING (BLUE) AND NADIR LOOKING (YELLOW) INSTRUMENTS, AND RESULTS FROM THE COMBINED MEASUREMENTS (RED). MEASURED PHOTOLYSIS RATES ARE COMPARED AGAINST THE TUV SIMULATED RESULTS (BLACK LINES) FOR CHANGES IN SOLAR ZENITH ANGLE, TOTAL OZONE COLUMNS INTERPOLATED FROM OMI SATELLITE DATA TO MATCH AIRCRAFT GEO-LOCATION, DEFAULT POLLUTION AEROSOL LOAD AND 0.9 SURFACE ALBEDO. FIGURE 4 SHOWS ADDITIONAL INSITU AEROSOL INFORMATION FOUND IN THE LARGE DATASET (PI B. ANDERSON). IT INCLUDES MEASUREMENTS BY TSI AND RR NEPHELOMETERS AT SEVERAL SPECTRAL CHANNELS. THE ABSORPTION AT THE 532 NM CHANNEL AND ANGSTROM PARAMETER ARE PLOTTED AS FUNCTION OF TIME. CHANGES IN THE ALTITUDE OF THE AIRCRAFT INDICATE PERIODS OF AEROSOLS MEASURED NEAR THE SURFACE AND ALOFT. LARGE DIFFERENCE BETWEEN MEASURED AND PREDICTED PHOTOLYSIS RATES DURING 18 AND 19 UT INDICATE THE EFFECT OF UNDERLYING CLOUDS THAT ARE NOT TAKEN INTO ACCOUNT IN TUV SETTINGS. PERIODS OF THE ASIAN POLLUTION LAYER SAMPLED BY THE AIRCRAFT DURING THE ARCTAS OVER ALASKA ARE CLEARLY INDICATED BY ELEVATED ABSORPTION AT 532 NM AND BY CHANGES IN THE ANGSTROM COEFFICIENT. Other Administrative Action $0 5/15/19 3 IMPROVING UNDERSTANDING AND MODELING CAPABILITY OF THE IMPACT OF TROPOSPHERIC AEROSOLS ON ACTINIC FLUXES OVER THE YEARS, THE CAFS INSTRUMENTS HAVE ACQUIRED A RICH DATA SET OF SPECTRAL ACTINIC FLUXES. SOME DATA FROM INDIVIDUAL FIELD CAMPAIGNS (SEE TABLE 1) HAVE BEEN PREVIOUSLY ANALYZED (ADHIKARY ET AL. 2010;PALANCAR ET AL. 2012; CORR ET AL. 2012). IN ORDER TO MAKE THE BEST USE OF OBSERVATIONAL DATA, WE PROPOSE TO DEVELOP A HARMONIZED DATA SET, CALLED AEROSOL ATTENUATED ACTINIC FLUX (AAAF), BY INTEGRATING HIGHQUALITY CAFS DATA OF ACTINIC FLUX SPECTRA AND J-VALUES REPRESENTATIVE OF DIFFERENT AEROSOL-LADEN CONDITIONS. AAAF WILL ALSO INCLUDE SPECTRAL AEROSOL OPTICAL MODELS THAT WILL BE DEVELOPED UNDER THIS PROPOSAL, AS WELL AS AUXILIARY DATA (E.G., SUN POSITION, ALTITUDE, SURFACE ALBEDO, OZONE, ETC.) NEEDED BY RADIATIVE TRANSFER MODELS FOR CALCULATIONS OF OBSERVED ACTINIC FLUX SPECTRA. INITIALLY, WE WILL PERFORM AN IN-DEPTH STATISTICAL ANALYSIS OF CAFS SPECTRAL ACTINIC FLUXES MEASURED DURING INDIVIDUAL FIELD CAMPAIGNS LISTED IN TABLE 1. THE PURPOSE OF THIS ANALYSIS IS TWO-FOLD. FOR ONE, THE ANALYSIS WILL BE AIMED AT OBSERVATIONALLY IDENTIFYING AND CHARACTERIZING THE MAJOR FEATURES IN ACTINIC FLUX SPECTRA SPECIFIC TO CERTAIN AEROSOL TYPES. FOR EXAMPLE, THE PRELIMINARY ANALYSES OF THE CAFS MEASUREMENTS TAKEN ON APRIL 12, 2008 DURING THE ARCTAS MISSION REVEAL SIGNIFICANT VARIABILITY. FIGURE 3 SHOWS PHOTOLYSIS RATES OF OZONE (JO3) WITH TIME (UT). THE CHANGES IN JO3 ARE CAUSED BY CHANGES IN ELEVATION OF SUN(INCREASING SZA), ALTITUDE OF THE AIRCRAFT AND GEO-LOCATION OF THE AIRCRAFT (OVERHEAD OZONE AND TEMPERATURE VARIABILITY). PHOTOLYSIS RATES SHOWN IN FIG. 3 ARE BASED ON MEASUREMENTS OF ACTINIC FLUX DATA BY THE UPWARD LOOKING (BLUE) AND NADIR LOOKING (YELLOW) INSTRUMENTS, AND RESULTS FROM THE COMBINED MEASUREMENTS (RED). MEASURED PHOTOLYSIS RATES ARE COMPARED AGAINST THE TUV SIMULATED RESULTS (BLACK LINES) FOR CHANGES IN SOLAR ZENITH ANGLE, TOTAL OZONE COLUMNS INTERPOLATED FROM OMI SATELLITE DATA TO MATCH AIRCRAFT GEO-LOCATION, DEFAULT POLLUTION AEROSOL LOAD AND 0.9 SURFACE ALBEDO. FIGURE 4 SHOWS ADDITIONAL INSITU AEROSOL INFORMATION FOUND IN THE LARGE DATASET (PI B. ANDERSON). IT INCLUDES MEASUREMENTS BY TSI AND RR NEPHELOMETERS AT SEVERAL SPECTRAL CHANNELS. THE ABSORPTION AT THE 532 NM CHANNEL AND ANGSTROM PARAMETER ARE PLOTTED AS FUNCTION OF TIME. CHANGES IN THE ALTITUDE OF THE AIRCRAFT INDICATE PERIODS OF AEROSOLS MEASURED NEAR THE SURFACE AND ALOFT. LARGE DIFFERENCE BETWEEN MEASURED AND PREDICTED PHOTOLYSIS RATES DURING 18 AND 19 UT INDICATE THE EFFECT OF UNDERLYING CLOUDS THAT ARE NOT TAKEN INTO ACCOUNT IN TUV SETTINGS. PERIODS OF THE ASIAN POLLUTION LAYER SAMPLED BY THE AIRCRAFT DURING THE ARCTAS OVER ALASKA ARE CLEARLY INDICATED BY ELEVATED ABSORPTION AT 532 NM AND BY CHANGES IN THE ANGSTROM COEFFICIENT. Funding Only Action $59.0k 4/25/19