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| Titel |
On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California |
| VerfasserIn |
S. E. Pusede, D. R. Gentner, P. J. Wooldridge, E. C. Browne, A. W. Rollins, K.-E. Min, A. R. Russell, J. Thomas, L. Zhang, W. H. Brune, S. B. Henry, J. P. DiGangi, F. N. Keutsch, S. A. Harrold, J. A. Thornton, M. R. Beaver, J. M. St. Clair, P. O. Wennberg, J. Sanders, X. Ren, T. C. VandenBoer, M. Z. Markovic, A. Guha, R. Weber, A. H. Goldstein, R. C. Cohen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 7 ; Nr. 14, no. 7 (2014-04-04), S.3373-3395 |
| Datensatznummer |
250118564
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| Publikation (Nr.) |
 copernicus.org/acp-14-3373-2014.pdf |
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| Zusammenfassung |
| The San Joaquin Valley (SJV) experiences some of the worst ozone air quality
in the US, frequently exceeding the California 8 h standard of 70.4 ppb.
To improve our understanding of trends in the number of ozone violations in
the SJV, we analyze observed relationships between organic reactivity,
nitrogen oxides (NOx), and daily maximum temperature in the southern
SJV using measurements made as part of California at the Nexus of Air
Quality and Climate Change in 2010 (CalNex-SJV). We find the daytime
speciated organic reactivity with respect to OH during CalNex-SJV has a
temperature-independent portion with molecules typically associated with
motor vehicles being the major component. At high temperatures,
characteristic of days with high ozone, the largest portion of the total
organic reactivity increases exponentially with temperature and is dominated
by small, oxygenated organics and molecules that are unidentified. We use
this simple temperature classification to consider changes in organic
emissions over the last and next decade. With the CalNex-SJV observations as
constraints, we examine the sensitivity of ozone production (PO3) to
future NOx and organic reactivity controls. We find that PO3 is
NOx-limited at all temperatures on weekends and on weekdays when daily
maximum temperatures are greater than 29 °C. As a consequence, NOx
reductions are the most effective control option for reducing the frequency
of future ozone violations in the southern SJV. |
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