Observational evidence reveals the significance of nocturnal chemistry in seasonal secondary organic aerosol formation.

ABSTRACT: Oxidized Organic Aerosol (OOA), a major component of fine atmospheric particles, impacts climate and human health. Previous experiments and atmospheric models emphasize the importance of nocturnal OOA formation from NO₃· oxidation of biogenic VOCs. This seasonal study extends the understanding by showing that nocturnal oxidation of biomass-burning emissions can account for up to half of total OOA production in fall and winter. It is the first to distinguish nocturnal OOA characteristics from daytime OOA across all seasons using bulk aerosol measurements. Summer observations of nocturnal OOA align well with regional chemistry transport model predictions, but discrepancies in other seasons reveal a common model deficiency in representing biomass-burning emissions and their nocturn

SUBMITTER: Liu L 

PROVIDER: S-EPMC11379628 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature