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Discussion papers
https://doi.org/10.5194/acp-2019-939
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-939
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 22 Oct 2019

Submitted as: research article | 22 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Composition and volatility of SOA formed from oxidation of real tree emissions compared to single VOC-systems

Arttu Ylisirniö1, Angela Buchholz1, Claudia Mohr2,3, Zijun Li1, Luis Barreira1,4, Andrew Lambe5, Celia Faiola1,6, Eetu Kari1,a, Taina Yli-Juuti1, Sergey A. Nizkorodov7, Douglas R. Worsnop5, Annele Virtanen1, and Siegfried Schobesberger1 Arttu Ylisirniö et al.
  • 1Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
  • 2Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 3Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden
  • 4Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, Finland
  • 5Center for Aerosol and Cloud Chemistry, Aerodyne Research, Inc., Billerica, MA, USA
  • 6Department of Ecology and Evolutionary Biology, University of California, Irvine, Irvine, USA
  • 7Department of Chemistry, University of California, Irvine, Irvine, USA
  • acurrently at: Neste Oyj, Espoo, Finland

Abstract. Secondary organic aerosol (SOA) is an important constituent of the atmosphere where SOA particles are formed chiefly by the condensation or reactive uptake of oxidation products of volatile organic compounds (VOC). The mass yield in SOA particle formation, as well as the chemical composition and volatility of the particles are determined by the identity of the VOC precursor(s) and the oxidation conditions they experience. In this study, we used an oxidation flow reactor to generate biogenic SOA from the oxidation of Scots pine emissions. Mass yields, chemical composition, and volatility of the SOA particles were characterized and compared with SOA particles formed from oxidation of α-pinene and of a mixture of acyclic/monocyclic sesquiterpenes (farnesenes and bisabolenes), which are significant components of the Scots pine emissions. SOA mass yields for Scots pine emissions dominated by farnesenes were lower than for α-pinene, but higher than for the artificial mixture of farnesenes and bisabolenes. The reduction in the SOA yield in the farnesenes and bisabolenes dominated mixtures is due to C=C bond scission in these acyclic/monocyclic sesquiterpenes during ozonolysis leading to smaller and generally more volatile products. SOA particles from the oxidation of Scots pine emission had similar or lower volatility than SOA particles formed from either of single precursor. Applying physical stress to the Scots pine plants increased monoterpene emissions, which further decreased SOA particle volatility and increased SOA mass yield. Our results highlight the need to account for the chemical complexity and structure of real-world biogenic VOC emissions and stress-induced changes to plant emissions when modelling SOA production and properties in the atmosphere. These results emphasize that simple increase or decrease of relative monoterpene and sesquiterpene emissions should not be used as indicator of SOA particle volatility.

Arttu Ylisirniö et al.
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Short summary
We studied chemical composition and volatility of secondary organic aerosol particles formed from emissions of Scots pine and compared those results to SOA formed from α-pinene and from a sesquiterpene mixture. We found that SOA formed from single precursors cannot capture the properties of SOA formed from real plant emissions.
We studied chemical composition and volatility of secondary organic aerosol particles formed...
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