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| Titel |
Characterizing ozone production in the Mexico City Metropolitan Area: a case study using a chemical transport model |
| VerfasserIn |
W. Lei, B. Foy, M. Zavala, R. Volkamer, L. T. Molina |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2007-02-27), S.1347-1366 |
| Datensatznummer |
250004748
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| Publikation (Nr.) |
 copernicus.org/acp-7-1347-2007.pdf |
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| Zusammenfassung |
| An episodic simulation is conducted to characterize midday (12:00–17:00 CDT) ozone
(O3) photochemical production and to investigate its sensitivity to
emission changes of ozone precursors in the Mexico City Metropolitan Area
(MCMA) during an "O3-South" meteorological episode using the
Comprehensive Air Quality Model with extensions (CAMx). High Ox
(O3+NO2) photochemical production rates of 10–80 ppb/h are
predicted due to the high reactivity of volatile organic compounds (VOCs) in
which alkanes, alkenes, and aromatics exert comparable contributions. The
predicted ozone production efficiency is between 4–10 O3 molecules per
NOx molecule oxidized, and increases with VOC-to-NO2 reactivity
ratio. Process apportionment analyses indicate significant outflow of
pollutants such as O3 and peroxyacetyl nitrate (PAN) from the urban
area to the surrounding regional environment. PAN is not in chemical-thermal
equilibrium during the photochemically active periods. Sensitivity studies
of O3 production suggest that O3 formation in the MCMA urban
region with less chemical aging (NOz/NOy<0.3) is VOC-limited.
Both the simulated behavior of O3 production and its sensitivities to
precursors suggest that midday O3 formation during this episode is
VOC-sensitive in the urban region on the basis of the current emissions
inventory estimates, and current NOx levels depress the O3
production. |
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