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| Titel |
The production and persistence of ΣRONO2 in the Mexico City plume |
| VerfasserIn |
A. E. Perring, T. H. Bertram, D. K. Farmer, P. J. Wooldridge, J. Dibb, N. J. Blake, D. R. Blake, H. B. Singh, H. Fuelberg, G. Diskin, G. Sachse, 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 ; 10, no. 15 ; Nr. 10, no. 15 (2010-08-06), S.7215-7229 |
| Datensatznummer |
250008681
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| Publikation (Nr.) |
 copernicus.org/acp-10-7215-2010.pdf |
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| Zusammenfassung |
| Alkyl and multifunctional nitrates (RONO2, ΣANs) have been
observed to be a significant fraction of NOy in a number of different
chemical regimes. Their formation is an important free radical chain
termination step ending production of ozone and possibly affecting formation
of secondary organic aerosol. ΣANs also represent a potentially large,
unmeasured contribution to OH reactivity and are a major pathway for the
removal of nitrogen oxides from the atmosphere. Numerous studies have
investigated the role of nitrate formation from biogenic compounds and in
the remote atmosphere. Less attention has been paid to the role ΣANs
may play in the complex mixtures of hydrocarbons typical of urban settings.
Measurements of total alkyl and multifunctional nitrates, NO2, total
peroxy nitrates (ΣPNs), HNO3 and a representative suite of
hydrocarbons were obtained from the NASA DC-8 aircraft during spring of 2006
in and around Mexico City and the Gulf of Mexico. ΣANs were observed
to be 10–20% of NOy in the Mexico City plume and to increase in
importance with increased photochemical age. We describe three conclusions:
(1) Correlations of ΣANs with odd-oxygen (Ox) indicate a stronger
role for ΣANs in the photochemistry of Mexico City than is expected
based on currently accepted photochemical mechanisms, (2) ΣAN formation
suppresses peak ozone production rates by as much as 40% in the
near-field of Mexico City and (3) ΣANs play a significant role in the
export of NOy from Mexico City to the Gulf Region. |
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