ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-7415-2010 The contribution of marine organics to the air quality of the western United States Gantt B. 1 Meskhidze N. 1 Carlton A. G. 2 Department of Marine, Earth, and Atmospheric Sciences North Carolina State University, Raleigh, NC, USA Office of Research and Development, National Exposure Research Laboratory Environmental Protection Agency, RTP, NC, USA 09 08 2010 10 15 7415 7423 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/10/7415/2010/acp-10-7415-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/7415/2010/acp-10-7415-2010.pdf

The contribution of marine organic emissions to the air quality in coastal areas of the western United States is studied using the latest version of the US Environmental Protection Agency (EPA) regional-scale Community Multiscale Air Quality (CMAQv4.7) modeling system. Emissions of marine isoprene, monoterpenes, and primary organic matter (POM) from the ocean are implemented into the model to provide a comprehensive view of the connection between ocean biology and atmospheric chemistry and air pollution. Model simulations show that marine organics can increase the concentration of PM<sub>2.5</sub> by 0.1–0.3 μg m<sup>−3</sup> (up to 5%) in some coastal cities such as San Francisco, CA. This increase in the PM<sub>2.5</sub> concentration is primarily attributed to the POM emissions, with small contributions from the marine isoprene and monoterpenes. When marine organic emissions are included, organic carbon (OC) concentrations over the remote ocean are increased by up to 50% (25% in coastal areas), values consistent with recent observational findings. This study is the first to quantify the air quality impacts from marine POM and monoterpenes for the United States, and it highlights the need for inclusion of marine organic emissions in air quality models.

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