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This is the first article of a series presenting a detailed analysis ofbromine chemistry simulated with the atmospheric chemistry generalcirculation model ECHAM5/MESSy. Release from sea salt is an important brominesource, hence the model explicitly calculates aerosol chemistry and phasepartitioning for coarse mode aerosol particles. Many processes includingchemical reaction rates are influenced by the particle size distribution, andaerosol associated water strongly affects the aerosol pH. Knowledge of theaerosol pH is important as it determines the aerosol chemistry, e.g., theefficiency of sulphur oxidation and bromine release. Here, we focus on thesimulated sea salt aerosol size distribution and the coarse mode aerosol pH.  A comparison with available field data shows that the simulated aerosoldistributions agree reasonably well within the range of measurements. Inspite of the small number of aerosol pH measurements and the uncertainty inits experimental determination, the simulated aerosol pH compares well withthe observations. The aerosol pH ranges from alkaline aerosol in areas ofstrong production down to pH-values of 1 over regions of medium sea saltproduction and high levels of gas phase acids, mostly polluted regions overthe oceans in the Northern Hemisphere

Consistent simulation of bromine chemistry from the marine boundary layer to the stratosphere – Part 1: Model description, sea salt aerosols and pH