ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-5755-2008 The role of sea-salt emissions and heterogeneous chemistry in the air quality of polluted coastal areas Athanasopoulou E. 1 Tombrou M. 1 Pandis S. N. 2 Russell A. G. 3 National and Kapodistrian University of Athens, Faculty of Physics, Dept. of Environmental Physics and Meteorology, Athens, Greece Dept. of Chemical Engineering, University of Patras, 26500 Patras, Greece School of Civil and Environmental Engineering, Georgia Inst. of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0512, USA 01 10 2008 8 19 5755 5769 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/8/5755/2008/acp-8-5755-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/5755/2008/acp-8-5755-2008.pdf

Open-ocean and surf-zone sea-salt aerosol (SSA) emission parameterizations are incorporated in the CAMx aerosol model and applied over an area with an extended Archipelago (Greece), with a fine grid nested over the highly populated Attica peninsula. The maximum indirect impact of SSA on PM<sub>10</sub> mass (35%) is located over a marine area with moderate SSA production and elevated shipping emissions (central Aegean Sea) where SSA interacts with anthropogenic nitric acid forming sodium nitrate. SSA increases PM<sub>10</sub> levels in the Athens city center up to 25% during stable onshore winds. Under such conditions both open-ocean and surf-zone mechanisms contribute to aerosol production over Attica. A hybrid scheme for gas-to-particle mass transfer is necessary for accurately simulating semi-volatile aerosol components when coarse SSA is included. Dynamically simulating mass transfer to the coarse particles leads to a quadrupling of predicted PM<sub>10</sub> nitrate in the Athens city center and up to two orders of magnitude in its coarse mass in comparison to using a bulk equilibrium approach.

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