HR: 1340h
AN: A33A-0823    [Abstracts]
TI: Observations of Processed Asian Pollution with a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) from the C-130 Aircraft During the INTEX-B Field Campaign
AU: * Dunlea, E
EM: edward.dunlea@colorado.edu
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States
AU: DeCarlo, P
EM: peter.decarlo@colorado.edu
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States
AU: DeCarlo, P
EM: peter.decarlo@colorado.edu
AF: University of Colorado, Department of Atmospheric and Oceanic Science, Boulder, CO 80309-0311, United States
AU: Aiken, A
EM: allison.aiken@colorado.edu
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States
AU: Aiken, A
EM: allison.aiken@colorado.edu
AF: University of Colorado, Department of Chemistry, Boulder, CO 80309, United States
AU: Kimmel, J
EM: Joel.Kimmel@colorado.edu
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States
AU: Kimmel, J
EM: Joel.Kimmel@colorado.edu
AF: Aerodyne Research Incorporated, 45 Manning Road, Billerica, MA 01821, United States
AU: Bahreini, R
EM: Roya.Bahreini@noaa.gov
AF: National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, United States
AU: Peltier, R
EM: rpeltier@eas.gatech.edu
AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA 30332, United States
AU: Weber, R
EM: rweber@eas.gatech.edu
AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA 30332, United States
AU: Tomlinson, J
EM: jason.tomlinson@tamu.edu
AF: Texas A&M University, Department of Atmospheric Sciences, College Station, TX 77843, United States
AU: Collins, D
EM: dcollins@tamu.edu
AF: Texas A&M University, Department of Atmospheric Sciences, College Station, TX 77843, United States
AU: Shinozuka, Y
AF: University of Hawaii, Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Howell, S
AF: University of Hawaii, Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Clarke, A
AF: University of Hawaii, Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Emmons, L
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Apel, E
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Pfister, G
EM: pfister@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: van Donkelaar, A
AF: Dalhousie University, Department of Physics and Atmospheric Science, Halifax, NS B3H 3J5, Canada
AU: Millet, D
EM: millet@eps.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA 02138, United States
AU: Jimenez, J
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309-0216, United States
AU: Jimenez, J
AF: University of Colorado, Department of Chemistry, Boulder, CO 80309, United States
AB: Measurements of submicron, non-refractory aerosol mass were made from the NCAR/NSF C-130 aircraft using a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) during the spring 2006 INTEX-B field campaign based in Seattle. We intercepted numerous Asian pollution layers, some after rapid transport across the Pacific and others after slower transport which had reduced aerosol concentrations and were depleted of short-lived tracers. The aerosol in Asian pollution layers intercepted over the Eastern Pacific Ocean was shown to have a predominance of sulfate over organic material, the latter being highly oxidized. Measurements and back trajectory calculations are consistent with the following sequence: (a) relatively more rapid conversion of organic precursors to organic aerosol compared to conversion of SO2 to sulfate just downwind of Asian urban centers and pollution sources, (b) uplift and transport of air masses resulting in washout of most aerosol material leaving relatively more SO2 available, and (c) subsequent SO2 to sulfate conversion as air masses are transported across the Pacific. This is consistent with Brock et al., JGR, 2004. Two case studies will be presented to describe this evolution of aerosol chemical composition during transport from Asia. Overall correlations of several tracers will be shown for comparing MOZART and GEOS-Chem model outputs with the measurements. Also, comparisons of AMS measurements with other aerosol instruments will be shown.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting