Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 19 2008 10.5194/acp-8-5899-2008 http://www.atmos-chem-phys.net/8/5899/2008/ http://www.atmos-chem-phys.net/8/5899/2008/acp-8-5899-2008.html http://www.atmos-chem-phys.net/8/5899/2008/acp-8-5899-2008.pdf 5899 5917 2008-10-15 Consistent simulation of bromine chemistry from the marine boundary layer to the stratosphere – Part 1: Model description, sea salt aerosols and pH A. Kerkweg akerkweg@mpch-mainz.mpg.de P. Jöckel A. Pozzer H. Tost R. Sander M. Schulz P. Stier E. Vignati J. Wilson J. Lelieveld 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 Laboratoire des Sciences du Climat et de l'Environnement, CEA-IPSL, Saclay, France Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, UK Joint Research Centre, Institute of Environment and Sustainability, Ispra, Italy This is the first article of a series presenting a detailed analysis of bromine chemistry simulated with the atmospheric chemistry general circulation model ECHAM5/MESSy. Release from sea salt is an important bromine source, hence the model explicitly calculates aerosol chemistry and phase partitioning for coarse mode aerosol particles. Many processes including chemical reaction rates are influenced by the particle size distribution, and aerosol associated water strongly affects the aerosol pH. Knowledge of the aerosol pH is important as it determines the aerosol chemistry, e.g., the efficiency of sulphur oxidation and bromine release. 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