Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 6 2008 10.5194/acp-8-1835-2008 http://www.atmos-chem-phys.net/8/1835/2008/ http://www.atmos-chem-phys.net/8/1835/2008/acp-8-1835-2008.html http://www.atmos-chem-phys.net/8/1835/2008/acp-8-1835-2008.pdf 1835 1853 2008-03-27 Investigating the sources and atmospheric processing of fine particles from Asia and the Northwestern United States measured during INTEX B R. E. Peltier A. H. Hecobian R. J. Weber rweber@eas.gatech.edu A. Stohl E. L. Atlas D. D. Riemer D. R. Blake E. Apel T. Campos T. Karl Georgia Institute of Technology, School of Earth and Atmospheric Science, Atlanta, GA 30332-0340, USA Norwegian Institute for Air Research, 2027 Kjeller, Norway University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL 33149-1098, USA Department of Chemistry. University of California Irvine, Irvine, CA, 92697-2025, USA National Center for Atmospheric Research, Atmospheric Chemistry Division, Boulder, CO 80307, USA now at: Department of Environmental Medicine, NYU School of Medicine, Tuxedo, NY 10987, USA During the National Aeronautics and Space Administration (NASA) Intercontinental Chemical Transport Experiment, Phase B (INTEX-B), in the spring of 2006, airborne measurements were made in the United States Pacific Northwest of the major inorganic ions and the water-soluble organic carbon (WSOC) of submicron (PM_1.0) aerosol. An atmospheric trajectory (HYSPLIT) and a Lagrangian particle dispersion model (Flexpart) quantifying source contributions for carbon monoxide (CO) were used to segregate air masses into those of primarily Asian influence (>75% Asian CO) or North American influence (>75% North American CO). Of the measured compounds, fine particle mass mostly consisted of water-soluble organic carbon and sulfate, with median sulfate and WSOC concentrations in two to four times higher, respectively, in North American air masses versus transported Asian air masses. The fraction of WSOC to sulfate in transported Asian air masses was significantly lower than one at altitudes above 3 km due to depleted organic aerosol, opposite to what has been observed closer to Asia and in the northeastern United States, where organic components were at higher concentrations than sulfate in the free troposphere. The observations could be explained by loss of sulfate and organic aerosol by precipitation scavenging, with reformation of mainly sulfate during advection from Asia to North America. In contrast to free tropospheric measurements, for all air masses below approximately 2 km altitude median WSOC-sulfate ratios were consistently between one and two. 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