ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-8351-2009 Toward a general parameterization of N<sub>2</sub>O<sub>5</sub> reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride Bertram T. H. 1 2 Thornton J. A. 1 Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA now at: Department of Chemistry, University of California San Diego, La Jolla, CA 03 11 2009 9 21 8351 8363 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/9/8351/2009/acp-9-8351-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/8351/2009/acp-9-8351-2009.pdf

The heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> on mixed organic-inorganic aerosol particles was investigated using an entrained aerosol flow tube coupled to a custom-built chemical ionization mass spectrometer. Laboratory results on aqueous particles confirm a strong dependence of the reactive uptake coefficient (γ) on particle liquid water, for particle water concentrations below 15 M, and the molar ratio of particle water to nitrate. Measurements of &gamma; (N<sub>2</sub>O<sub>5</sub>) on mixed chloride-nitrate particles indicate that the presence of trace chloride can negate the suppression of γ(N<sub>2</sub>O<sub>5</sub>) at high nitrate loadings with implications for polluted coastal regions. These results are used to construct a new parameterization for &gamma; (N<sub>2</sub>O<sub>5</sub>), that when coupled to an aerosol thermodynamics model, can be used within regional and/or global chemical transport models.

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