A Four Carbon Organonitrate as a Significant Product of Secondary Isoprene Chemistry

Tsiligiannis E., Wu R., Lee B. H., Salvador C. M., Priestley M., Carlsson P. T. M., ...Daha Fazla

Geophysical Research Letters, cilt.49, sa.11, 2022 (SCI-Expanded, Scopus) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 49 Sayı: 11
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1029/2021gl097366
  • Dergi Adı: Geophysical Research Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Communication Abstracts, Compendex, Geobase, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: organonitrate, isoprene, VOC oxidation, atmospheric chamber, ORGANIC AEROSOL SOA, IONIZATION MASS-SPECTROMETRY, METHYL VINYL KETONE, GAS-PHASE REACTIONS, NO3-INITIATED OXIDATION, TROPOSPHERIC DEGRADATION, MOLECULAR COMPOSITION, PEROXY-RADICALS, SURFACE OZONE, IODIDE CIMS
  • Ankara Üniversitesi Adresli: Hayır

Özet

Oxidation of isoprene by nitrate radicals (NO3) or by hydroxyl radicals (OH) under high NOx conditions forms a substantial amount of organonitrates (ONs). ONs impact NOx concentrations and consequently ozone formation while also contributing to secondary organic aerosol. Here we show that the ONs with the chemical formula C4H7NO5 are a significant fraction of isoprene-derived ONs, based on chamber experiments and ambient measurements from different sites around the globe. From chamber experiments we found that C4H7NO5 isomers contribute 5%–17% of all measured ONs formed during nighttime and constitute more than 40% of the measured ONs after further daytime oxidation. In ambient measurements C4H7NO5 isomers usually dominate both nighttime and daytime, implying a long residence time compared to C5 ONs which are removed more rapidly. We propose potential nighttime sources and secondary formation pathways, and test them using a box model with an updated isoprene oxidation scheme.