Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-635-2009 http://www.atmos-chem-phys-discuss.net/9/635/2009/ http://www.atmos-chem-phys-discuss.net/9/635/2009/acpd-9-635-2009.html http://www.atmos-chem-phys-discuss.net/9/635/2009/acpd-9-635-2009.pdf 635 671 2009-01-08 Gas/particle partitioning of water-soluble organic aerosol in Atlanta C. J. Hennigan M. H. Bergin A. G. Russell A. Nenes R. J. Weber rweber@eas.gatech.edu School of Civil and Environmental Engineering, Georgia Institute of Technology, USA School of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 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 (WSOC_<i>p</i>) is mainly from secondary organic aerosol (SOA) production. Comparisons between WSOC_<i>p</i>, organic carbon (OC) and elemental carbon (EC) indicate that WSOC_<i>p</i> was a nearly comprehensive measure of SOA in the Atlanta summertime. To study SOA formation mechanisms, WSOC gas-particle partitioning was investigated as a function of temperature, RH, NO_x, O₃, and organic aerosol mass concentration. Identifying a clear temperature effect on partitioning was confounded by other temperature-dependent processes, which likely included the emissions of biogenic SOA precursors and photochemical SOA formation. Relative humidity data indicated a linear dependence between partitioning and fine particle liquid water. Lower NO_x concentrations were associated with greater partitioning to particles, but WSOC partitioning had no visible relation to O₃ or fine particle OC mass concentration. 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