Instantaneous Nitric Oxide Effect on Secondary Organic Aerosol Formation from m-Xylene Photooxidation

  • Li L
  • Tang P
  • Cocker Iii D
  • 2

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Abstract

Secondary organic aerosol (SOA) formation from aromatic hydrocarbon photooxidation is highly sensitive to NO concentration. The instantaneous effect of NO on SOA formation from m-xylene photooxidation is investigated in this work by data mining 10 years of aromatic hydrocarbon chamber experiments conducted in the UC Riverside/CE-CERT chamber. First, the effect of sub-ppb NO concentrations on SOA formation is explored. The relationship of SOA growth rate to 1) NO2/NO ratio; 2) instantaneous HC/NO; 3) absolute NO concentration; 4) peroxy radical reaction branching ratio and 5) hydroxyl radical concentration are illustrated. Second, continuous and stepwise NO, NO2 and HONO injection are applied to m-xylene photooxidation experiments to simulate continuous NO sources in an urban area. The influence of these reaction scenarios on radical concentrations and SOA formation is explored. [HO2·]/[RO2·] shows a strong correlation with SOA yields in addition to [·OH]/[HO2·], [·OH], [HO2·] and [RO2·]. Enhanced SOA formation is observed when low NO levels (

Author-supplied keywords

  • Aromatic hydrocarbon
  • Kinetic Modeling
  • NOx
  • Radicals
  • Secondary Organic Aerosol

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Authors

  • Lijie Li

  • Ping Tang

  • David R Cocker Iii

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