Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 24, issue 7
Articles | Volume 24, issue 7
https://doi.org/10.5194/acp-24-4473-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-24-4473-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 24, issue 7
Research article
 | 
17 Apr 2024
Research article |  | 17 Apr 2024

Formation and loss of light absorbance by phenolic aqueous SOA by ●OH and an organic triplet excited state

Stephanie Arciva, Lan Ma, Camille Mavis, Chrystal Guzman, and Cort Anastasio

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Anastasio, C. and McGregor, K. G.: Chemistry of fog waters in California's Central Valley: 1. In situ photoformation of hydroxyl radical and singlet molecular oxygen, Atmos. Environ., 35, 1079–1089, https://doi.org/10.1016/S1352-2310(00)00281-8, 2001. 
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Arciva, S., Niedek, C., Mavis, C., Yoon, M., Sanchez, M. E., Zhang, Q., and Anastasio, C.: Aqueous ⚫ OH oxidation of highly substituted phenols as a source of secondary organic aerosol, Environ. Sci. Technol., 56, 9959–9967, https://doi.org/10.1021/acs.est.2c02225, 2022. 
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We measured changes in light absorption during the aqueous oxidation of six phenols with hydroxyl radical (●OH) or an organic triplet excited state (3C*). All the phenols formed light-absorbing secondary brown carbon (BrC), which then decayed with continued oxidation. Extrapolation to ambient conditions suggest ●OH is the dominant sink of secondary phenolic BrC in fog/cloud drops, while 3C* controls the lifetime of this light absorption in particle water.
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