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Key role of NO3 radicals in the production of isoprene nitrates and nitrooxyorganosulfates in Beijing

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Published copy (DOI)

Author(s)

  • Dan Bryant
  • B Ouyang
  • Thomas J. Bannan
  • Archit Mehra
  • Alfie Mayhew
  • J R Hopkins
  • Stephen D. Worrall
  • Asan Basak
  • Hugh Coe
  • Carl J. Percival
  • Lisa K. Whalley
  • Dwayne E. Heard
  • Eloise Slater
  • Roderic L. Jones
  • Tianqu Cui
  • Jason D Surratt
  • C. E. Reeves
  • G Mills
  • Sue Grimmond
  • Yele Sun
  • Weiqi Xu
  • Zongbo Shi

Department/unit(s)

Publication details

JournalEnvironmental Science & Technology
DateAccepted/In press - 18 Dec 2020
DatePublished (current) - 7 Jan 2021
Issue number2
Volume55
Number of pages12
Pages (from-to)842–853
Original languageEnglish

Abstract

The formation of isoprene nitrates (IsN) can lead to significant secondary organic aerosol (SOA) production and they can act as reservoirs of atmospheric nitrogen oxides. In this work, we estimate the rate of production of IsN from the reactions of isoprene with OH and NO3 radicals during the summertime in Beijing. While OH dominates the loss of isoprene during the day, NO3 plays an increasingly important role in the production of IsN from the early afternoon onwards. Unusually low NO concentrations during the afternoon resulted in NO3 mixing ratios of ca. 2 pptv at approximately 15:00, which we estimate to account for around a third of the total IsN production in the gas phase. Heterogenous uptake of IsN produces nitrooxyorganosulfates (NOS). Two mono-nitrated NOS were correlated with particulate sulfate concentrations and appear to be formed from sequential NO3 and OH oxidation. Di-and tri-nitrated isoprene related NOS, formed from multiple NO3 oxidation steps, peaked during the night. This work highlights that NO3 chemistry can play a key role in driving biogenic-anthropogenic interactive chemistry in Beijing with respect to the formation of IsN during both the day and night.

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© 2021 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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