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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 5 | Copyright
Atmos. Chem. Phys., 18, 3589-3601, 2018
https://doi.org/10.5194/acp-18-3589-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 12 Mar 2018

Research article | 12 Mar 2018

Multi-generation chemical aging of α-pinene ozonolysis products by reactions with OH

Ningxin Wang1, Evangelia Kostenidou2,3, Neil M. Donahue1, and Spyros N. Pandis1,2,3 Ningxin Wang et al.
  • 1Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, USA
  • 2Department of Chemical Engineering, University of Patras, Patra, Greece
  • 3Institute of Chemical Engineering Sciences (ICE-HT), FORTH, Patra, Greece

Abstract. Secondary organic aerosol (SOA) formation from volatile organic compounds (VOCs) in the atmosphere can be thought of as a succession of oxidation steps. The production of later-generation SOA via continued oxidation of the first-generation products is defined as chemical aging. This study investigates aging in the α-pinene ozonolysis system with hydroxyl radicals (OH) through smog chamber experiments. The first-generation α-pinene ozonolysis products were allowed to react further with OH formed via HONO photolysis. After an equivalent of 2–4 days of typical atmospheric oxidation conditions, homogeneous OH oxidation of the α-pinene ozonolysis products resulted in a 20–40% net increase in the SOA for the experimental conditions used in this work. A more oxygenated product distribution was observed after aging based on the increase in aerosol atomic oxygen-to-carbon ratio (O:C) by up to 0.04. Experiments performed at intermediate relative humidity (RH) of 50% showed no significant difference in additional SOA formation during aging compared to those performed at a low RH of less than 20%.

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This study investigates aging in the α-pinene ozonolysis system with hydroxyl radicals (OH) through smog chamber experiments. After an equivalent of 2–4 days of typical atmospheric oxidation conditions, homogeneous OH oxidation of the α-pinene ozonolysis products resulted in a 20–40 % net increase in the organic aerosol concentration and an increase in aerosol O : C by up to 0.04. The relative humidity in the 5–50 % range had a minimum effect on aging.
This study investigates aging in the α-pinene ozonolysis system with hydroxyl radicals (OH)...
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