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| Titel |
Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study |
| VerfasserIn |
L. Lee, P. J. Wooldridge, J. B. Gilman, C. Warneke, J. de Gouw, 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. 22 ; Nr. 14, no. 22 (2014-11-27), S.12441-12454 |
| Datensatznummer |
250119189
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| Publikation (Nr.) |
 copernicus.org/acp-14-12441-2014.pdf |
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| Zusammenfassung |
| Nitrogen dioxide (NO2) and total alkyl nitrates (ΣANs) were
measured using thermal dissociation laser-induced fluorescence during the
2012 Uintah Basin Winter Ozone Study (UBWOS) in Utah, USA. The observed
NO2 concentration was highest before sunrise and lowest in the late
afternoon, suggestive of a persistent local source of NO2 coupled with
turbulent mixing out of the boundary layer. In contrast, ΣANs
co-varied with solar radiation with a noontime maximum, indicating that
local photochemical production combined with rapid mixing and/or deposition
was the dominant factor in determining the ΣAN concentrations. We
calculate that ΣANs were a large fraction (~60%)
of the HOx free radical chain termination and show that the temperature
dependence of the alkyl nitrate yields enhances the role of ΣANs in
local chemistry during winter by comparison to what would occur in the
warmer temperatures of summer. |
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