postbrief/science meeting 3:00 tue 8 jul 2008

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Summary of ARCTAS P-3 Data Flight #21 Flown 7 Jul 2008 Phil Russell, NASA Ames with contributions from many, many experimenters, modelers, forecasters, & P-3 air & flight crews. Postbrief/Science Meeting 3:00 Tue 8 Jul 2008. AOD, 0Z,7/8. STEM Model prediction (U Iowa): July 7 P3 Flight. - PowerPoint PPT Presentation

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  • Summary ofARCTAS P-3 Data Flight #21Flown 7 Jul 2008

    Phil Russell, NASA Ameswith contributions from many, many experimenters, modelers, forecasters, & P-3 air & flight crewsPostbrief/Science Meeting3:00 Tue 8 Jul 2008

  • AOD, 0Z,7/8STEM Model prediction (U Iowa): July 7 P3 Flight

  • GEOS5 Forecast: July 7 P3 FlightLots of aerosols in the Siberian fire/Asian anthro. Plume, including sulfate, dust, OC, & BC.

  • GEOS5 Forecast: July 7 P3 FlightNo significant California fire or N. American pollution.A strong Siberia fire/Asian anthropogenic plume between 7-10 km. Weak Siberia fire/Asian anthropogenic plumes between 1-6 km.

  • P-3 in ARCTAS: Payload AOD Ext H2O vapor Cavity Ringdown ext (2l) Reciprocal Neph sca (2, RH )

    Radiance, BRDF Flux,(l), albedo(l) Flux,, albedo Nenes CCN PVM cloud drop reff, vol TECO O3COBALT: CO

    Ames Airborne Tracking Sunphotometer (AATS-14)Solar Spectral Flux Radiometer (SSFR)Broad-Band Radiometers (BBR)LW SWHiGEAR Aerosols & O3 OPC & DMA dry size dist, volatility Tandem Volatility DMA Neph scat + PSAP abs Humidified Neph f(RH) Ultrafine & CN Time of Flight Mass Spec size resolved chemistry SP2 black carbon mass AERO3XCloud Absorption Radiometer (CAR)P-3 Data System (PDS): Nav, Flight, Met (P, T, RH, )REVEAL & RTMM

  • AOD, 0Z,7/8P3 Plan A Mon 7 JulGoals:Asian-Siberian plume above low cloud in A-Train footprints (in situ aer, CO, O3, rad gradient & stack, CAR cloud BRDF, CALIPSO val, aer effects on MODIS PM cloud retrievals)Ice Field BRDFClear-sky work at WP 6 as fallback.

  • P3 Plan B Mon 7 JulGoals:Asian-Siberian plume above Saturn Island AERONET (in situ aer, CO, O3 -AATS spiral, rad gradient & stack, CAR-AERONET)Ice Field BRDFClear-sky work at WP 6 as fallback.AOD = 0.49 on 6 Jul

  • AOD, 0Z,7/8

  • GEOS5 Forecast: July 7 P3 Flight - CloudsSome middle and high clouds near Cold Lake. Close to Vancouver and Victoria island, some low clouds but no middle/high clouds.

  • AOD, 0Z,7/8

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:Aerosol radiative forcing efficiency (DF/DAOT) under edge of advancing Asian/Siberian plumeAerosol effects on MODIS-Terra cloud remote sensingTests of model aerosol, CO, & O3 predictions @ many locationsRadiant flux divergence stacks for SSA(l) @ 2 locationsCAR circles over AERONET for CAR-AERONET retrievals3-way closure (in situ, AATS, AERONET) in spiral1233344563

  • *

    J. Redemann, P. Pilewskie, P. Russell. NASA Ames & U. Colorado*Climate Change Science in INTEX-A/ICARTT Measurements of Aerosol Effects on the Solar Energy that Drives ClimateSolar energy [W m-2]Aerosol Amount, AOD(499 nm)Jetstream 31 (J31)Forcing Efficiency [W m-2]CaseSlope = Aerosol Radiative Forcing EfficiencyCase 2, 21 Jul 2004Scientific ConclusionsThe gradients (spatial variations) in AOD that occur frequently off the US East coast provide a natural laboratory for studying effects of aerosol particles on solar energy, and hence on climate.For the average aerosol optical depth of ~0.5 in the 10 cases shown above, aerosols on average reduced the incident visible radiation (near midday) by the amount of energy it would take to power one 40 W light bulb for every square meter of ocean surface (0.5 x -80 W m-2 = -40 W m-2; see right frame above).Redemann et al., JGR, 2006Boreal Forest Fire Smoke Early in INTEX-A

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:Aerosol radiative forcing efficiency (DF/DAOT) under edge of advancing Asian/Siberian plumeAerosol effects on MODIS-Terra cloud remote sensingTests of model aerosol, CO, & O3 predictions @ many locationsRadiant flux divergence stacks for SSA(l) @ 2 locationsCAR circles over AERONET for CAR-AERONET retrievals3-way closure (in situ, AATS, AERONET) in spiral1233344563

  • S. Howell et al., HiGEARPRELIMINARY

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:4. Radiant flux divergence stacks for SSA(l) @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral456

  • Downwelling Flux: F

    Upwelling Flux: F

    Net Flux: F- F

    Flux Divergence (absorption):(F- F)2000m- (F- F)43m

    Fractional absorption:[(F- F)2000m- (F- F)43m]/ F2000m

    2000 m43 mBackground on Radiative Flux Divergence & Closure, Absorption Spectra, etc.P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008

    P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008

  • P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007Aerosol Absorption Optical Depth (AAOD) Spectra from 5 ExperimentsWavelength, nmAbsorption Optical DepthBergstrom et al., ACP, 2007AAOD = K l-AAEAbsorption Angstrom Exponent (AAE)AAE =1.452.272.341.051.12For Black Carbon, AAE = 1

    P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:4. Radiant flux divergence stacks for SSA(l) @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral456

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:4. Radiant flux divergence stacks for SSA(l) @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral456

  • The first half of the flight encountered a well-mixed local pollution layer up to ~2 km GPS altitude and a long-range transport air mass above, both homogenous over >200 km.Julian Day UTC220 kmPRELIMINARY DATAfrom AATS & HiGEAR groups

  • AOD at 550 nm between 500 6250 m GPS alt : 0.201PRELIMINARY DATAfrom HiGEAR groupClarke, McNaughton, Howell, Freitag et al.

  • Missing layers at the top and bottom estimated by extrapolation, as illustrated in subsequent slides.PRELIMINARYData from AATS, AERONET, & HiGEAR groups:Redemann, Shinozuka, Livingston, Ramachandran et al.McArthur et al.Clarke, McNaughton, Howell, Freitag et al.Analysis by Yohei Shinozuka

  • RH, 0Z,7/8 at 5.5 kmRH, 0Z,7/8 at 1.5 kmRH, 0Z,7/8 at 8.5 km

  • Siberia biomass burning plume between 1-6 km + weak Asian anthropogenic pollution.GEOS5 Forecast 20080707_06Z: July 7 P3 Flight

  • AOD, 0Z,7/8

  • AOD, 0Z,7/8

  • AOD, 0Z,7/8

  • AOD, 0Z,7/8

  • AOD, 0Z,7/8

  • P3 For July 7, 2007Anthro lower

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:4. Radiant flux divergence stacks for SSA(l) @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral456

  • AOD, 0Z,7/8P3 Actual Mon 7 JulAccomplishments:4. Radiant flux divergence stacks for SSA(l) @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral456

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