Aqueous-Phase Secondary Organic Aerosol Formation Via Reactions with Organic Triplet Excited States—a Short Review

摘要

Abstract Secondarily formed species are found to play significant and often dominant roles in the particular matter pollution. However, the formation mechanisms of secondary organic species are highly complex thus are much less understood. This short review summarizes current studies regarding the secondary organic aerosol formed in atmospheric aqueous phases (cloud/fog drops and aqueous aerosols) via oxidation by the organic triplet excited states, including the current systems of interests, and major findings, etc. Overall, this specific formation route is relatively less studied but likely important in atmospheric chemistry. Future research needs and directions of this reaction pathway are proposed. Particularly, more studies are needed to elucidate its role in atmospheric processes regarding humic-like substances, detailed chemical characterization of the reaction products and efforts to account for influences of such pathway into air quality models.