ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-2919-2009 Sensitivities of the absorptive partitioning model of secondary organic aerosol formation to the inclusion of water Barley M. 1 Topping D. O. 1 2 Jenkin M. E. 3 McFiggans G. 1 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 05 05 2009 9 9 2919 2932 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/2919/2009/acp-9-2919-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/2919/2009/acp-9-2919-2009.pdf

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. A recently reported third version of the partitioning model using individual component molar masses was shown to give significantly different results to the other two models. Further sensitivities to an assumed pre-existing particulate loading and to parameterised organic component non-ideality are explored and shown to contribute significantly to the variation in predicted secondary organic particulate loading.

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