Articles | Volume 24, issue 7
https://doi.org/10.5194/acp-24-4473-2024
https://doi.org/10.5194/acp-24-4473-2024
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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Cited articles

Aguilera, R., Corringham, T., Gershunov, A., and Benmarhnia, T.: Wildfire smoke impacts respiratory health more than fine particles from other sources: observational evidence from Southern California., Nat. Commun., 12, 1493, https://doi.org/10.1038/s41467-021-21708-0, 2021. 
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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. 
Andreae, M. O.: Emission of trace gases and aerosols from biomass burning – an updated assessment, Atmos. Chem. Phys., 19, 8523–8546, https://doi.org/10.5194/acp-19-8523-2019, 2019. 
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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Short summary
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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