Articles | Volume 19, issue 1
https://doi.org/10.5194/acp-19-649-2019
https://doi.org/10.5194/acp-19-649-2019
Research article
 | 
17 Jan 2019
Research article |  | 17 Jan 2019

A potential source of atmospheric sulfate from O2−-induced SO2 oxidation by ozone

Narcisse Tchinda Tsona and Lin Du

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Short summary
We used ab initio calculations to explore a new path for ion-induced SO2 oxidation by ozone in the gas phase. We find that, initiated by the superoxide ion, SO2 can readily oxidize to SO−3. The reaction is facilitated by the presence of water, being ~ 4 orders of magnitude faster than the reaction in the absence of water. Depending on the altitude and temperature, it is estimated that this reaction may contribute to 0.1–2.0 % of the total atmospheric sulfate.
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