 |
| Titel |
Global modeling of organic aerosol: the importance of reactive nitrogen (NOx and NO3) |
| VerfasserIn |
H. O. T. Pye, A. W. H. Chan, M. P. Barkley, J. H. Seinfeld |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 22 ; Nr. 10, no. 22 (2010-11-30), S.11261-11276 |
| Datensatznummer |
250008920
|
| Publikation (Nr.) |
 copernicus.org/acp-10-11261-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|