ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-10-11261-2010 Global modeling of organic aerosol: the importance of reactive nitrogen (NO<sub>x</sub> and NO<sub>3</sub>) Pye H. O. T. 1 3 Chan A. W. H. 1 4 Barkley M. P. 2 5 Seinfeld J. H. 1 Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, USA School of GeoSciences, University of Edinburgh, Edinburgh, Scotland, UK now at: Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA now at: Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA now at: EOS Group, Department of Physics and Astronomy, University of Leicester, UK 30 11 2010 10 22 11261 11276 Copyright: © 2010 H. O. T. Pye et al. 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/10/11261/2010/acp-10-11261-2010.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/10/11261/2010/acp-10-11261-2010.pdf

Reactive nitrogen compounds, specifically NO<sub>x</sub> and NO<sub>3</sub>, likely influence global organic aerosol levels. To assess these interactions, GEOS-Chem, a chemical transport model, is updated to include improved biogenic emissions (following MEGAN v2.1/2.04), a new organic aerosol tracer lumping scheme, aerosol from nitrate radical (NO<sub>3</sub>) oxidation of isoprene, and NO<sub>x</sub>-dependent monoterpene and sesquiterpene aerosol yields. As a result of significant nighttime terpene emissions, fast reaction of monoterpenes with the nitrate radical, and relatively high aerosol yields from NO<sub>3</sub> oxidation, biogenic hydrocarbon-NO<sub>3</sub> reactions are expected to be a major contributor to surface level aerosol concentrations in anthropogenically influenced areas such as the United States. By including aerosol from nitrate radical oxidation in GEOS-Chem, terpene (monoterpene + sesquiterpene) aerosol approximately doubles and isoprene aerosol is enhanced by 30 to 40% in the Southeast United States. In terms of the global budget of organic aerosol, however, aerosol from nitrate radical oxidation is somewhat minor (slightly more than 3 Tg/yr) due to the relatively high volatility of organic-NO<sub>3</sub> oxidation products in the yield parameterization. Globally, 69 to 88 Tg/yr of organic aerosol is predicted to be produced annually, of which 14–15 Tg/yr is from oxidation of monoterpenes and sesquiterpenes and 8–9 Tg/yr from isoprene.

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