Articles | Volume 24, issue 1
https://doi.org/10.5194/acp-24-1-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-24-1-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Jan 2024
Research article |
| 02 Jan 2024
| 02 Jan 2024
Seasonal variations in photooxidant formation and light absorption in aqueous extracts of ambient particles
Lan Ma
Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
now at: SGS-CSTC Standards Technical Services Co. Ltd., Hangzhou Branch, Hangzhou, Zhejiang Province, 310052, China
Reed Worland
Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
now at: Department of Chemistry, University of Washington, 1410 Northeast Campus Parkway, Seattle, WA 98195, USA
Laura Heinlein
Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
Chrystal Guzman
Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
now at: Department of Pharmacology, University of Washington, 1410 Northeast Campus Parkway, Seattle, WA 98195, USA
Wenqing Jiang
Department of Environmental Toxicology, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
Christopher Niedek
Department of Environmental Toxicology, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
Keith J. Bein
Center for Health and the Environment, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
Department of Environmental Toxicology, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
Department of Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, USA
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Short summary
We measured concentrations of three photooxidants – the hydroxyl radical, triplet excited states of organic carbon, and singlet molecular oxygen – in fine particles collected over a year. Concentrations are highest in extracts of fresh biomass burning particles, largely because they have the highest particle concentrations and highest light absorption. When normalized by light absorption, rates of formation for each oxidant are generally similar for the four particle types we observed.
We measured concentrations of three photooxidants – the hydroxyl radical, triplet excited states...
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