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Low Temperatures Enhance Organic Nitrate Formation: Evidence from Observations in the 2012 Uintah Basin Winter Ozone Study : Volume 14, Issue 11 (30/06/2014)

By Lee, L.

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Book Id: WPLBN0003979799
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Low Temperatures Enhance Organic Nitrate Formation: Evidence from Observations in the 2012 Uintah Basin Winter Ozone Study : Volume 14, Issue 11 (30/06/2014)  
Author: Lee, L.
Volume: Vol. 14, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Gilman, J. B., Wooldridge, P. J., Warneke, C., Gouw, J. D., Lee, L., & Cohen, R. C. (2014). Low Temperatures Enhance Organic Nitrate Formation: Evidence from Observations in the 2012 Uintah Basin Winter Ozone Study : Volume 14, Issue 11 (30/06/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Chemistry, University of California, Berkeley, CA, USA. 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 at the warmer temperatures of summer.

Summary
Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study

Excerpt
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