Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 11 2009 10.5194/acp-9-3613-2009 http://www.atmos-chem-phys.net/9/3613/2009/ http://www.atmos-chem-phys.net/9/3613/2009/acp-9-3613-2009.html http://www.atmos-chem-phys.net/9/3613/2009/acp-9-3613-2009.pdf 3613 3628 2009-06-04 Gas/particle partitioning of water-soluble organic aerosol in Atlanta C. J. Hennigan M. H. Bergin A. G. Russell A. Nenes R. J. Weber School of Civil and Environmental Engineering, Georgia Institute of Technology, Georgia, USA School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Georgia, USA School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Georgia, USA now at: The Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA Gas and particle-phase organic carbon compounds soluble in water (e.g., WSOC) were measured simultaneously in Atlanta throughout the summer of 2007 to investigate gas/particle partitioning of ambient secondary organic aerosol (SOA). Previous studies have established that, in the absence of biomass burning, particulate WSOC (WSOCp) is mainly from secondary organic aerosol (SOA) production. Comparisons between WSOCp, organic carbon (OC) and elemental carbon (EC) indicate that WSOCp was a nearly comprehensive measure of SOA in the Atlanta summertime. WSOCp and gas-phase WSOC (WSOCg) concentrations both exhibited afternoon maxima, indicating that photochemistry was a major route for SOA formation. An additional nighttime maximum in the WSOCg concentration indicated a dark source for oxidized organic gases, but this was not accompanied by detectable increases in WSOCp. To study SOA formation mechanisms, WSOC gas/particle partitioning was investigated as a function of temperature, RH, NOx, O3, and organic aerosol mass concentration. No clear relationship was observed between temperature and partitioning, possibly due to a simultaneous effect from other temperature-dependent processes. For example, positive temperature effects on emissions of biogenic SOA precursors and photochemical SOA formation may have accounted for the observed similar proportional increases of WSOCp and WSOCg with temperature. Relative humidity data indicated a linear dependence between partitioning and predicted fine particle liquid water. 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