ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-8-20311-2008 Sensitivities of the absorptive partitioning model of secondary organic aerosol formation to the inclusion of water Barley M. 1 Topping D. O. 2 McFiggans G. 1 Jenkin M. E. 3 Centre for Atmospheric Sciences, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, M13 9PL, UK National Centre for Atmospheric Sciences, Univ. of Manchester, Manchester, M13 9PL, UK Atmospheric Chemistry Services, Yelverton, Devon, PL20 6EN, UK 04 12 2008 8 6 20311 20348 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-discuss.net/8/20311/2008/acpd-8-20311-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/8/20311/2008/acpd-8-20311-2008.pdf

Depending on the assumptions about the participation of water in absorptive partitioning, the prediction of the distribution of semi-volatile organic component between the gaseous and condensed phases is shown to be highly sensitive to the ambient relative humidity and the formulation of the partitioning model used. Further sensitivities to the 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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