ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-5919-2008 Consistent simulation of bromine chemistry from the marine boundary layer to the stratosphere – Part 2: Bromocarbons Kerkweg A. 1 2 Jöckel P. 1 Warwick N. 3 Gebhardt S. 1 Brenninkmeijer C. A. M. 1 Lelieveld J. 1 MPI for Chemistry (Otto Hahn Institute), Atmospheric Chemistry Department, P.O. Box 3060, 55020 Mainz, Germany Institute for Atmospheric Physics, University of Mainz, Mainz, Germany University of Cambridge, Chemistry Department, Lensfield Road, Cambridge, CB2 1EW, UK 15 10 2008 8 19 5919 5939 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.net/8/5919/2008/acp-8-5919-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/5919/2008/acp-8-5919-2008.pdf

In this second part of a series of articles dedicated to a detailed analysis of bromine chemistry in the atmosphere we address one (out of two) dominant natural sources of reactive bromine. The two main source categories are the release of bromine from sea salt and the decomposition of bromocarbons by photolysis and reaction with OH. Here, we focus on C<sub>1</sub>-bromocarbons. We show that the atmospheric chemistry general circulation model ECHAM5/MESSy realistically simulates their emission, transport and decomposition from the boundary layer up to the mesosphere. We included oceanic emission fluxes of the short-lived bromocarbons CH<sub>2</sub>Br<sub>2</sub>, CH<sub>2</sub>ClBr, CHClBr<sub>2</sub>, CHCl<sub>2</sub>Br, CHBr<sub>3</sub> and of CH<sub>3</sub>Br. The vertical profiles and the surface mixing ratios of the bromocarbons are in general agreement with the (few available) observations, especially in view of the limited information available and the consequent coarseness of the emission fields. For CHBr<sub>3</sub>, CHCl<sub>2</sub>Br and CHClBr<sub>2</sub> photolysis is the most important degradation process in the troposphere. In contrast to this, tropospheric CH<sub>2</sub>Br<sub>2</sub>, CH<sub>3</sub>Br and CH<sub>2</sub>ClBr are more efficiently decomposed by reaction with OH. In the free troposphere approximately 40% of the C<sub>1</sub>-bromocarbons decompose by reaction with OH. Our results indicate that bromoform contributes substantial amounts of reactive bromine to the lower stratosphere and thus should not be neglected in stratospheric simulations.

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