期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 10, 期 22, 页码 11261-11276出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-10-11261-2010
关键词
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资金
- Office of Science (BER), US Department of Energy [DE-FG02-05ER63983]
- US Environmental Protection Agency (EPA) [RD-833749]
- Natural Environment Research Council [NE/D001471]
- Natural Environment Research Council [NE/G013810/2] Funding Source: researchfish
- NERC [NE/G013810/2] Funding Source: UKRI
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.
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