ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-7-11647-2007 Volatile organic compound ratios as probes of halogen atom chemistry in the Arctic Cavender A. E. 1 Biesenthal T. A. 2 6 Bottenheim J. W. 3 Shepson P. B. 1 2 4 5 Department of Chemistry, Purdue University, West Lafayette, IN, USA Department of Chemistry, York University, Toronto, Ontario, Canada Science and Technology Branch, Environment Canada, Toronto, Ontario, Canada Department of Earth and Atmospheric Science, Purdue University, West Lafayette, IN, USA Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, USA now at: Sciex, Concord, Ontario, Canada 08 08 2007 7 4 11647 11683 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/7/11647/2007/acpd-7-11647-2007.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/7/11647/2007/acpd-7-11647-2007.pdf

Volatile organic compound concentration ratios can be used as indicators of halogen chemistry that occurs during ozone depletion events in the Arctic during spring. Here we use a combination of modeling and measurements of [acetone]/[propanal] as an indicator of bromine chemistry, and [isobutane]/[n-butane] and [methyl ethyl ketone]/[n-butane] are used to study the extent of chlorine chemistry during four ozone depletion events during the Polar Sunrise Experiment of 1995. Using a 0-D photochemistry model in which the input of halogen atoms is controlled and varied, the approximate ratio of [Br]/[Cl] can be estimated for each ozone depletion event. It is concluded that there must be an additional source of propanal (likely from the snowpack) to correctly simulate the VOC chemistry of the Arctic, and that the ratio of Br atoms to Cl atoms can vary greatly during ozone depletion events.

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