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| Titel |
Impact of a new condensed toluene mechanism on air quality model predictions in the US |
| VerfasserIn |
G. Sarwar, K. W. Appel, A. G. Carlton, R. Mathur, K. Schere, R. Zhang, M. A. Majeed |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 4, no. 1 ; Nr. 4, no. 1 (2011-03-14), S.183-193 |
| Datensatznummer |
250001560
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| Publikation (Nr.) |
 copernicus.org/gmd-4-183-2011.pdf |
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| Zusammenfassung |
| A new condensed toluene mechanism is incorporated into the Community
Multiscale Air Quality Modeling system. Model simulations are performed
using the CB05 chemical mechanism containing the existing (base) and the new
toluene mechanism for the western and eastern US for a summer month. With
current estimates of tropospheric emission burden, the new toluene mechanism
increases monthly mean daily maximum 8-h ozone by 1.0–3.0 ppbv in Los
Angeles, Portland, Seattle, Chicago, Cleveland, northeastern US, and Detroit
compared to that with the base toluene chemistry. It reduces model mean bias
for ozone at elevated observed ozone concentrations. While the new mechanism
increases predicted ozone, it does not enhance ozone production efficiency.
A sensitivity study suggests that it can further enhance ozone if elevated
toluene emissions are present. While it increases in-cloud secondary organic
aerosol substantially, its impact on total fine particle mass concentration
is small. |
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