Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 9 2009 10.5194/acp-9-2919-2009 http://www.atmos-chem-phys.net/9/2919/2009/ http://www.atmos-chem-phys.net/9/2919/2009/acp-9-2919-2009.html http://www.atmos-chem-phys.net/9/2919/2009/acp-9-2919-2009.pdf 2919 2932 2009-05-05 Sensitivities of the absorptive partitioning model of secondary organic aerosol formation to the inclusion of water M. Barley D. O. Topping M. E. Jenkin G. McFiggans g.mcfiggans@manchester.ac.uk Centre for Atmospheric Sciences, School of Earth, Atmospheric & Environmental Sciences, University of Manchester, Manchester, M13 9PL, UK National Centre for Atmospheric Sciences, University of Manchester, Manchester, M13 9PL, UK Atmospheric Chemistry Services, Yelverton, Devon, PL20 6EN, UK The predicted distribution of semi-volatile organic components between the gaseous and condensed phase as a function of ambient relative humidity and the specific form of the partitioning model used has been investigated. A mole fraction based model, modified so as not to use molar mass in the calculation, was found to predict identical RH dependence of component partitioning to that predicted by the conventional mass-based partitioning model which uses a molar mass averaged according to the number of moles in the condensed phase. 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