Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
6
11
2006
10.5194/acp-6-3571-2006
http://www.atmos-chem-phys.net/6/3571/2006/
http://www.atmos-chem-phys.net/6/3571/2006/acp-6-3571-2006.html
http://www.atmos-chem-phys.net/6/3571/2006/acp-6-3571-2006.pdf
3571
3581
2006-08-31
Importance of the surface reaction OH + Cl<sup>−</sup> on sea salt aerosol for the chemistry of the marine boundary layer – a model study
R. von Glasow
roland.von.glasow@iup.uni-heidelberg.de
Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
The reaction of the hydroxyl radical with chloride on the surface of
sea salt aerosol producing gas phase Cl<sub>2</sub> and particulate
OH<sup>−</sup> and its implications for the chemistry of the marine
boundary layer under coastal, remote, and very remote conditions have
been investigated with a numerical model. This reaction had been
suggested by Laskin et al. (2003) to play a major role in the sulfur
cycle in the marine boundary layer by increasing the sulfate
production in sea salt by O<sub>3</sub> oxidation due to the
additional production of alkalinity in the particle. Based on
literature data a new "best estimate" for the rate coefficient of
the reaction was deduced and applied, showing that the additional
initial sulfate production by this reaction is less than 1%,
therefore having only a minor impact on sulfate production. Even
though the gas phase concentration of Cl<sub>2</sub> increased strongly
in the model, the concentration of Cl radicals increased by less than
5% for the "best guess" case. Additional feedbacks between the cycles
of chlorine and sulfur in the marine boundary layer are discussed as
well as a two-stage acidification of large fresh sea salt aerosol.
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