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The reaction of the hydroxyl radical with chloride on the surface ofsea salt aerosol producing gas phase Cl2 and particulateOH− and its implications for the chemistry of the marineboundary layer under coastal, remote, and very remote conditions havebeen investigated with a numerical model. This reaction had beensuggested by Laskin et al. (2003) to play a major role in the sulfurcycle in the marine boundary layer by increasing the sulfateproduction in sea salt by O3 oxidation due to theadditional production of alkalinity in the particle. Based onliterature data a new "best estimate" for the rate coefficient ofthe reaction was deduced and applied, showing that the additionalinitial sulfate production by this reaction is less than 1%,therefore having only a minor impact on sulfate production. Eventhough the gas phase concentration of Cl2 increased stronglyin the model, the concentration of Cl radicals increased by less than5% for the "best guess" case. Additional feedbacks between the cyclesof chlorine and sulfur in the marine boundary layer are discussed aswell as a two-stage acidification of large fresh sea salt aerosol

atmospheric chemistry and physics

Importance of the surface reaction OH + Cl&amp;lt;sup&amp;gt;−&amp;lt;/sup&amp;gt; on sea salt aerosol for the chemistry of the marine boundary layer – a model study