Articles | Volume 25, issue 16
https://doi.org/10.5194/acp-25-9561-2025
© Author(s) 2025. 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-25-9561-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
29 Aug 2025
Research article |
| 29 Aug 2025
| 29 Aug 2025
Surprisingly robust photochemistry in subarctic particles during winter: evidence from photooxidants
Laura M. D. Heinlein
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
Junwei He
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
Michael Oluwatoyin Sunday
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
now at: California Air Resources Board, Sacramento, CA, USA
Fangzhou Guo
Department of Earth & Atmospheric Sciences, University of Houston, Houston, TX 77204, USA
now at: Center for Atmospheric and Environmental Chemistry, Aerodyne Research Inc, Billerica, MA 01821, USA
James Campbell
Department of Chemistry and Biochemistry, University of Alaska, Fairbanks, AK 99775, USA
Allison Moon
Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, USA
Sukriti Kapur
Department of Chemistry, University of California, Irvine, CA 92697, USA
Ting Fang
Department of Chemistry, University of California, Irvine, CA 92697, USA
now at: Sustainable Energy and Environment Thrust, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, Guangdong 511400, China
Kasey Edwards
Department of Chemistry, University of California, Irvine, CA 92697, USA
Meeta Cesler-Maloney
Department of Chemistry and Biochemistry, University of Alaska, Fairbanks, AK 99775, USA
now at: Louisville Metro Air Pollution Control District, Louisville, KY 40203, USA
Alyssa J. Burns
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
Jack Dibb
College of Engineering & Physical Sciences, University of New Hampshire, Durham, NH 03824, USA
William Simpson
Department of Chemistry and Biochemistry, University of Alaska, Fairbanks, AK 99775, USA
Manabu Shiraiwa
Department of Chemistry, University of California, Irvine, CA 92697, USA
Becky Alexander
Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, USA
Jingqiu Mao
Department of Chemistry and Biochemistry, University of Alaska, Fairbanks, AK 99775, USA
James H. Flynn III
Department of Earth & Atmospheric Sciences, University of Houston, Houston, TX 77204, USA
Jochen Stutz
Department of Atmospheric & Oceanic Sciences, University of California, Los Angeles, CA 90095, USA
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
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Latest update: 18 Sep 2025
Short summary
High-latitude cities like Fairbanks, Alaska, experience severe wintertime pollution episodes. While conventional wisdom holds that oxidation is slow under these conditions, field measurements find oxidized products in particles. To explore this, we measured oxidants in aqueous extracts of winter particles from Fairbanks. We find high concentrations of oxidants during illumination experiments, indicating that particle photochemistry can be significant even in high latitudes during winter.
High-latitude cities like Fairbanks, Alaska, experience severe wintertime pollution episodes....
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