Rapid Wintertime Formation of Phenolic Secondary Organic Aerosol from Brown Carbon Photochemistry

Дата публикации: 27-08-2026 00:00:00

Abstract:
Biomass burning (BB) is a major organic aerosol source during urban winter pollution events. BB particles are rich in brown carbon (BrC) and absorb light to produce photooxidants such as oxidizing triplet excited states of organic chromophores (3C*). In midlatitudes, semivolatile phenols (ArOH) from BB are oxidized to form phenolic secondary organic aerosol (SOA) under moderate temperatures and sunlight. Here, we explore whether phenolic SOA is also formed in a cold, relatively dark, high-latitude city during winter. We use measurements from the 2022 ALPACA field campaign in Fairbanks, Alaska, incorporated into the PACT-1D model with added emissions, partitioning, and chemistry for 34 semivolatile BB phenols. The model includes phenol oxidation in the gas phase and in two populations of particles─aqueous and organic. Despite short pollutant residence times within the polluted surface layer, simulated phenolic SOA formation is fast, generating up to...

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