ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-831-2009 A global stratospheric bromine monoxide climatology based on the BASCOE chemical transport model Theys N. 1 Van Roozendael M. 1 Errera Q. 1 Hendrick F. 1 Daerden F. 1 Chabrillat S. 1 Dorf M. 2 Pfeilsticker K. 2 Rozanov A. 3 Lotz W. 3 Burrows J. P. 3 Lambert J.-C. 1 Goutail F. 4 Roscoe H. K. 5 De Mazière M. 1 Belgium Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium Institute for Environmental Physics, University of Heidelberg, Heidelberg, Germany Institute for Environmental Physics, University of Bremen, Bremen, Germany Service d'Aéronomie, Verrières-le-Buisson, France British Antarctic Survey, Cambridge, UK 03 02 2009 9 3 831 848 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/9/831/2009/acp-9-831-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/831/2009/acp-9-831-2009.pdf

A new climatology of stratospheric BrO profiles based on a parameterization using dynamical and chemical indicators has been developed, with the aim to apply it to the retrieval of tropospheric BrO columns from space nadir measurements. The adopted parameterization is based on three years of output data from the 3-D chemistry transport model BASCOE. The impact of the atmospheric dynamics on the stratospheric BrO distribution is treated by means of Br<sub>y</sub>/ozone correlations built from 3-D-CTM model results, while photochemical effects are taken into account using stratospheric NO<sub>2</sub> columns as an indicator of the BrO/Br<sub>y</sub> ratio. The model simulations have been optimized for bromine chemistry and budget, and validated through comparisons using an extensive data set of ground-based, balloon-borne and satellite limb (SCIAMACHY) stratospheric BrO observations.

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