Gas-Particle Partitioning and SOA Yields of Organonitrate Products from NO₃-Initiated Oxidation of Isoprene under Varied Chemical Regimes.

ABSTRACT: Alkyl nitrate (AN) and secondary organic aerosol (SOA) from the reaction of nitrate radicals (NO₃) with isoprene were observed in the Simulation of Atmospheric PHotochemistry In a large Reaction (SAPHIR) chamber during the NO₃Isop campaign in August 2018. Based on 15 day-long experiments under various reaction conditions, we conclude that the reaction has a nominally unity molar AN yield (observed range 90 ± 40%) and an SOA mass yield of OA + organic nitrate aerosol of 13-15% (with ∼50 μg m^-3 inorganic seed aerosol and 2-5 μg m^-3 total organic aerosol). Isoprene (5-25 ppb) and oxidant (typically ∼100 ppb O₃ and 5-25 ppb NO₂) concentrations and aerosol composition (inorganic and organic coating) were varied while remaining cl

SUBMITTER: Brownwood B 

PROVIDER: S-EPMC8054245 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature