Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study
Item
Title (Dublin Core)
Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study
Description (Dublin Core)
Nitrogen dioxide (NO<sub>2</sub>) 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 NO<sub>2</sub> concentration was highest before sunrise and lowest in the late afternoon, suggestive of a persistent local source of NO<sub>2</sub> 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 HO<sub>x</sub> 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.
Creator (Dublin Core)
Lee, L.
Wooldridge, P. J.
Gilman, J. B.
Warneke, C.
de Gouw, J.
Cohen, R. C.
Date (Dublin Core)
2018-09-07
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-14-12441-2014
https://acp.copernicus.org/articles/14/12441/2014/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
