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Global modeling of organic aerosol: the importance of reactive nitrogen (NOx and NO3)
- Source :
- Atmospheric Chemistry and Physics, Vol 10, Iss 22, Pp 11261-11276 (2010)
- Publication Year :
- 2010
- Publisher :
- Copernicus Publications, 2010.
-
Abstract
- Reactive nitrogen compounds, specifically NOx and NO3, 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 (NO3) oxidation of isoprene, and NOx-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 NO3 oxidation, biogenic hydrocarbon-NO3 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-NO3 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.
Details
- Language :
- English
- ISSN :
- 16807316 and 16807324
- Volume :
- 10
- Issue :
- 22
- Database :
- Directory of Open Access Journals
- Journal :
- Atmospheric Chemistry and Physics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b86dce14c1244949ac15c8696f264eb
- Document Type :
- article
- Full Text :
- https://doi.org/10.5194/acp-10-11261-2010