Journal
ATMOSPHERIC ENVIRONMENT
Volume 43, Issue 25, Pages 3811-3818Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2009.05.033
Keywords
Differential optical absorption; Bromine oxide; Ozone depletion; Marine boundary layer
Funding
- UK NERC Surface Ocean Lower Atmosphere Study [NE/D006554/1]
- School of Chemistry, University of Leeds
- Natural Environment Research Council [NE/D006570/1, NE/E005659/1, ncas10006] Funding Source: researchfish
- NERC [NE/D006570/1, ncas10006, NE/E005659/1] Funding Source: UKRI
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Bromine chemistry in the marine boundary layer is recognized to play an important role through catalytic ozone destruction, changes to the atmospheric oxidising capacity (by changing the OH/HO2 and NO/NO2 ratio) and oxidation of compounds such as dimethyl sulphide (DMS). However, the chemistry of bromine in polluted environments is not well understood and its effects are thought to be inhibited by reactions involving NOx (NO2 & NO). This paper describes long-path Differential Optical Absorption Spectroscopy (DOAS) observations of bromine oxide (BrO) at a semi-polluted coastal site in Roscoff, France. Significant concentrations of BrO (up to 7.5 +/- 1.0 pptv) were measured during daytime, indicating the presence of unknown sources or efficient recycling of reactive bromine from bromine nitrate (BrONO2), which should be the major reservoir for bromine in a high NOx environment. These measurements indicate that bromine chemistry can play an important role in polluted environments. (C) 2009 Elsevier Ltd. All rights reserved.
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