Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 12 2009 10.5194/acp-9-3999-2009 http://www.atmos-chem-phys.net/9/3999/2009/ http://www.atmos-chem-phys.net/9/3999/2009/acp-9-3999-2009.html http://www.atmos-chem-phys.net/9/3999/2009/acp-9-3999-2009.pdf 3999 4009 2009-06-18 Towards closing the gap between hygroscopic growth and activation for secondary organic aerosol – Part 2: Theoretical approaches M. D. Petters petters@atmos.colostate.edu H. Wex C. M. Carrico E. Hallbauer A. Massling G. R. McMeeking L. Poulain Z. Wu S. M. Kreidenweis F. Stratmann Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA Institute for Tropospheric Research, Leipzig, Germany now at: National Environmental Research Institute, Aarhus University, Roskilde, Denmark now at: Centre for Atmospheric Science, University of Manchester, Manchester, UK We examine the hygroscopic properties of secondary organic aerosol particles generated through the reaction of α-pinene and ozone using a continuous flow reaction chamber. The water activity versus composition relationship is calculated from measurements of growth factors at relative humidities up to 99.6% and from measurements of cloud condensation nuclei activity. The observed relationships are complex, suggesting highly non-ideal behavior for aerosol water contents at relative humidities less than 98%. We present two models that may explain the observed water activity-composition relationship equally well. 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