Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 4
Articles | Volume 26, issue 4
https://doi.org/10.5194/acp-26-2443-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-2443-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 4
Research article
 | 
17 Feb 2026
Research article |  | 17 Feb 2026

Photochemical and ozone-induced aging significantly alter the viscosity of aqueous trans-aconitic acid aerosol particles

Cynthia Antossian, Marcel Müller, and Ulrich K. Krieger

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Latest update: 08 Jun 2026
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Short summary
Organic aerosols undergo changes when exposed to oxidants like ozone or UV (ultraviolet) light. This study looks at how both aging processes affect particle properties, using trans-aconitic acid as a proxy for secondary organic aerosols. We found that exposure to UV light and ozone causes mass loss and changes viscosity significantly, up to 4 orders of magnitude. This suggests that aged particles may take much longer than untreated particles to equilibrate under dry conditions.
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