Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 13
Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9997-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-26-9997-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 13
Research article
 | 
16 Jul 2026
Research article |  | 16 Jul 2026

Alkaline dust deposition to foliage surfaces likely enhances the dry deposition velocity of SO2: an investigation in the Alberta Oil-Sands Region using the GEM-MACH air-quality model

Stefan Miller, Paul A. Makar, Kenjiro Toyota, Colin Lee, Verica Savic-Jovcic, Sepehr Fathi, Mahtab Majdzadeh, and Katherine Hayden

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Short summary
This work identifies an important and hitherto unsuspected controlling factor influencing the rate of deposition of atmospheric gases to foliage surfaces. We show base cation-containing dust that settles on foliage can raise the pH of thin water films on leaves, significantly increasing sulphur dioxide dry deposition rates (often by more than 1 cm s-1), and lowering concentrations (by up to 60%), near sources of alkaline dust emissions, changing sulphur deposition fluxes' spatial distribution.
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