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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Subject: Aerosols | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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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 SO3. 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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