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

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 4.5 μg m-3, with 99% produced by 3C* in organic particles. The modeled phenolic SOA explains up to 34% of measured daytime oxidized organic aerosol (OOA), indicating it is a significant portion of the poorly understood OOA in Fairbanks. Our results reveal that BrC photochemistry can be an important source of atmospheric oxidizing capacity even during high-latitude winters.

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Cite

BibTeX RIS

BibTeX

@article{heinlein2026rapid,
  title = {{Rapid Wintertime Formation of Phenolic Secondary Organic Aerosol from Brown Carbon Photochemistry}},
  author = {Laura Heinlein and Jonas Kuhn and Amna Ijaz and Brice Temime-Roussel and Karolina Cysneiros De Carvalho and Mallory Liebes and Fangzhou Guo and James Flynn and Kyle Moor and Brent Williams and Barbara D’anna and Jochen Stutz and Cort Anastasio},
  journal = {Environmental Science and Technology},
  year = {2026},
  month = jul,
  doi = {10.1021/acs.est.6c03997},
  url = {https://hal.science/hal-05857553v1},
  note = {CC BY-NC-ND},
}

RIS

TY  - JOUR
TI  - Rapid Wintertime Formation of Phenolic Secondary Organic Aerosol from Brown Carbon Photochemistry
AU  - Laura Heinlein
AU  - Jonas Kuhn
AU  - Amna Ijaz
AU  - Brice Temime-Roussel
AU  - Karolina Cysneiros De Carvalho
AU  - Mallory Liebes
AU  - Fangzhou Guo
AU  - James Flynn
AU  - Kyle Moor
AU  - Brent Williams
AU  - Barbara D’anna
AU  - Jochen Stutz
AU  - Cort Anastasio
PY  - 2026
DA  - 2026/07/31
JO  - Environmental Science and Technology
DO  - 10.1021/acs.est.6c03997
UR  - https://hal.science/hal-05857553v1
AB  - 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 4.5 μg m-3, with 99% produced by 3C* in organic particles. The modeled phenolic SOA explains up to 34% of measured daytime oxidized organic aerosol (OOA), indicating it is a significant portion of the poorly understood OOA in Fairbanks. Our results reveal that BrC photochemistry can be an important source of atmospheric oxidizing capacity even during high-latitude winters.
SN  - 0013-936X
SN  - 1520-5851
ER  -

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