Articles | Volume 16, issue 17
Atmos. Chem. Phys., 16, 11433–11450, 2016
https://doi.org/10.5194/acp-16-11433-2016
Atmos. Chem. Phys., 16, 11433–11450, 2016
https://doi.org/10.5194/acp-16-11433-2016

Research article 14 Sep 2016

Research article | 14 Sep 2016

Isotopic constraints on the role of hypohalous acids in sulfate aerosol formation in the remote marine boundary layer

Qianjie Chen et al.

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Short summary
The formation mechanisms of sulfate in the marine boundary layer are not well understood, which could result in large uncertainties in aerosol radiative forcing. We measure the oxygen isotopic composition (Δ17O) of sulfate collected in the MBL and analyze with a global transport model. Our results suggest that 33–50 % of MBL sulfate is formed via oxidation of S(IV) by hypohalous acids HOBr / HOCl in the aqueous phase, and the daily-mean HOBr/HOCl concentrations are on the order of 0.01–0.1 ppt.
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