Preprints
https://doi.org/10.5194/acp-2021-575
https://doi.org/10.5194/acp-2021-575

  26 Jul 2021

26 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

Biomass burning plume chemistry: OH radical initiated oxidation of 3-penten-2-one and its main oxidation product 2-hydroxypropanal

Niklas Illmann, Iulia Patroescu-Klotz, and Peter Wiesen Niklas Illmann et al.
  • Institute for Environmental and Atmospheric Research, Bergische Universität Wuppertal, Gaußstr. 20, 42097 Wuppertal, Germany

Abstract. In order to enlarge our understanding of biomass burning plume chemistry, the OH radical initiated oxidation of 3-penten-2-one (3P2), identified in biomass burning emissions, and 2-hydroxypropanal (2HPr) were investigated at 298 ± 3 K and 990 ± 15 mbar in two atmospheric simulation chambers using long-path FTIR spectroscopy. The rate coefficient of 3P2 + OH was determined to be (6.2 ± 1.0) × 10−11 cm3 molecule−1 s−1 and the molar first-generation yields for acetaldehyde, methyl glyoxal, 2HPr and the sum of PAN and CO2, used to determine the CH3C(O) radical yield, were 0.39 ± 0.07, 0.32 ± 0.08, 0.68 ± 0.27, and 0.56 ± 0.14, respectively, under conditions where the 3P2 derived peroxy radicals react solely with NO. The 2HPr + OH reaction was investigated using 3P2 + OH as a source of the α-hydroxyaldehyde adjusting the experimental conditions to shift the reaction system towards secondary oxidation processes. The rate coefficient was estimated to be (2.2 ± 0.6) × 10−11 cm3 molecule−1 s−1. Employing an Euler-Cauchy model to describe the temporal behaviour of the experiments, the further oxidation of 2HPr was shown to form methyl glyoxal, acetaldehyde and CO2 with estimated yields of 0.21 ± 0.05, 0.79 ± 0.05, and 0.79 ± 0.05, respectively.

Niklas Illmann et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-575', Anonymous Referee #1, 12 Aug 2021
  • RC2: 'Comment on acp-2021-575', Anonymous Referee #2, 26 Aug 2021
  • RC3: 'Comment on acp-2021-575', Aparajeo Chattopadhyay, 27 Aug 2021

Niklas Illmann et al.

Niklas Illmann et al.

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Latest update: 22 Oct 2021
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Short summary
Understanding the chemistry of biomass burning plumes is of global interest. Within this work we investigated the OH radical reaction of 3-penten-2-one, which has been identified in biomass burning emissions. We observed the primary formation of peroxyacetyl nitrate (PAN), a key NOx reservoir species. Besides, PAN precursors were also identified as main oxidation products. 3-penten-2-one is shown to be an example explaining rapid PAN formation within young biomass burning plumes.
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