New insights into the gas-phase oxidation of isoprene by the nitrate radical from experiments in the atmospheric simulation chamber SAPHIR, and the NO3-Isoprene Campaign at Saphir NO3-Isoprene Campaign at Saphir - INSU - Institut national des sciences de l'Univers Access content directly
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New insights into the gas-phase oxidation of isoprene by the nitrate radical from experiments in the atmospheric simulation chamber SAPHIR, and the NO3-Isoprene Campaign at Saphir NO3-Isoprene Campaign at Saphir

Philip Carlsson
  • Function : Author
Patrick Dewald
  • Function : Author
Nils Friedrich
  • Function : Author
John Crowley
Steven Brown
  • Function : Author
Juliane Fry
  • Function : Author
Bellamy Brownwood
  • Function : Author
Mattias Hallquist
Epameinondas Tsiligiannis
  • Function : Author
Xu Kangmin
  • Function : Author
Rupert Holzinger
  • Function : Author
Hendrik Fuchs
  • Function : Author
Anna Novelli
  • Function : Author
Birger Bohn
  • Function : Author
Franz Rohrer
  • Function : Author
Thomas Mentel
  • Function : Author
Changmin Cho
  • Function : Author
Luisa Hantschke
  • Function : Author
Sungah Kang
  • Function : Author
Sergej Wedel
  • Function : Author
Rongrong Wu
  • Function : Author

Abstract

* A full list of authors appears at the end of the abstract Experiments at a set of atmospherically relevant conditions were performed in the simulation chamber SAPHIR, investigating the oxidation of isoprene by the nitrate radical (NO3). An extremely comprehensive set of instruments detected trace gases, radicals, aerosol properties and hydroxyl (OH) and NO3 radical reactivity. The chemical conditions in the chamber were varied to change the fate of the peroxy radicals (RO2) formed after the reaction between NO3 and isoprene from either mainly recombining with other RO2 or mainly reacting with hydroperoxyl radicals (HO2). These major atmospheric pathways for RO2 radicals lead to the formation of organic nitrate compounds which then have different atmospheric fates. The experimental concentration profiles are compared to box model calculations using both the current Master Chemical Mechanism (MCM) as well as recently available literature data alongside new quantum chemical calculations. The discussion here focusses on the resulting RO2 distribution and deviations in the predictions of early products and total alkyl nitrate yields for the different chemical conditions. Preliminary results for instance show too high night time losses of alkyl nitrates due to ozonolysis in the current MCM.
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Dates and versions

insu-02904614 , version 1 (27-07-2020)

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Philip Carlsson, Patrick Dewald, Justin Shenolikar, Nils Friedrich, John Crowley, et al.. New insights into the gas-phase oxidation of isoprene by the nitrate radical from experiments in the atmospheric simulation chamber SAPHIR, and the NO3-Isoprene Campaign at Saphir NO3-Isoprene Campaign at Saphir. EGU General Assembly 2020, May 2020, Vienne, France. ⟨10.5194/egusphere-egu2020-11196⟩. ⟨insu-02904614⟩
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