ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-749-2010 The critical assessment of vapour pressure estimation methods for use in modelling the formation of atmospheric organic aerosol Barley M. H. 1 McFiggans G. 1 Centre for Atmospheric Sciences, School of Earth, Environmental and Atmospheric Science, University of Manchester, Manchester, UK 25 01 2010 10 2 749 767 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/10/749/2010/acp-10-749-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/749/2010/acp-10-749-2010.pdf

A selection of models for estimating vapour pressures have been tested against experimental data for a set of compounds selected for their particular relevance to the formation of atmospheric aerosol by gas-liquid partitioning. The experimental vapour pressure data (all <100 Pa) of 45 multifunctional compounds provide a stringent test of the estimation techniques, with a recent complex group contribution method providing the best overall results. The effect of errors in vapour pressures upon the formation of organic aerosol by gas-liquid partitioning in an atmospherically relevant example is also investigated. The mass of organic aerosol formed under typical atmospheric conditions was found to be very sensitive to the variation in vapour pressure values typically present when comparing estimation methods.

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