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Halogens and Their Role in Polar Boundary-layer Ozone Depletion : Volume 7, Issue 2 (29/03/2007)

By Simpson, W. R.

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Book Id: WPLBN0003997930
Format Type: PDF Article :
File Size: Pages 119
Reproduction Date: 2015

Title: Halogens and Their Role in Polar Boundary-layer Ozone Depletion : Volume 7, Issue 2 (29/03/2007)  
Author: Simpson, W. R.
Volume: Vol. 7, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Sander, R., Bottenheim, J., Glasow, R. V., Anderson, P., Neff, B., Platt, U.,...Wolff, E. (2007). Halogens and Their Role in Polar Boundary-layer Ozone Depletion : Volume 7, Issue 2 (29/03/2007). Retrieved from

Description: Geophysical Institute and Department of Chemistry, University of Alaska Fairbanks, Fairbanks, AK, 99775-6160, USA. During springtime in the polar regions, unique photochemistry converts inert halide salts ions (e.g. Br) into reactive halogen species (e.g. Br atoms and BrO) that deplete ozone in the boundary layer to near zero levels. Since their discovery in the late 1980s, research on ozone depletion events (ODEs) has made great advances; however many key processes remain poorly understood. In this article we review the history, chemistry, dependence on environmental conditions, and impacts of ODEs. This research has shown the central role of bromine photochemistry, but how salts are transported from the ocean and are oxidized to become reactive halogen species in the air is still not fully understood. Halogens other than bromine (chlorine and iodine) are also activated through incompletely understood mechanisms that are probably coupled to bromine chemistry. The main consequence of halogen activation is chemical destruction of ozone, which removes the primary precursor of atmospheric oxidation, and generation of reactive halogen atoms/oxides that become the primary oxidizing species. The different reactivity of halogens as compared to OH and ozone has broad impacts on atmospheric chemistry, including near complete removal and deposition of mercury, alteration of oxidation fates for organic gases, and export of bromine into the free troposphere. Recent changes in the climate of the Arctic and state of the Arctic sea ice cover are likely to have strong effects on halogen activation and ODEs; however, more research is needed to make meaningful predictions of these changes.

Halogens and their role in polar boundary-layer ozone depletion

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