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Preprints
https://doi.org/10.5194/acp-2020-648
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-648
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  16 Jul 2020

16 Jul 2020

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This preprint is currently under review for the journal ACP.

Source identification of atmospheric organic vapors in two European pine forests: Results from Vocus PTR-TOF observations

Haiyan Li1, Manjula R. Canagaratna2, Matthieu Riva3, Pekka Rantala1, Yanjun Zhang1, Steven Thomas1, Liine Heikkinen1, Pierre-Marie Flaud4,5, Eric Villenave4,5, Emilie Perraudin4,5, Douglas Worsnop2, Markku Kulmala1, Mikael Ehn1, and Federico Bianchi1 Haiyan Li et al.
  • 1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland
  • 2Aerodyne Research Inc., Billerica, Massachusetts 01821, USA
  • 3Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626, Villeurbanne, France
  • 4University of Bordeaux, EPOC, UMR 5805 CNRS, 33405 Talence Cedex, France
  • 5CNRS, EPOC, UMR 5805 CNRS, 33405 Talence Cedex, France

Abstract. Atmospheric organic vapors play essential roles in the formation of secondary organic aerosol. Source identification of these vapors is thus fundamental to understand their emission sources and chemical evolution in the atmosphere and their further impact on air quality and climate change. In this study, a Vocus proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF) was deployed in two forested environments, the Landes forest in southern France and the boreal forest in southern Finland, to measure atmospheric organic vapors, including both volatile organic compounds (VOCs) and their oxidation products. For the first time, we performed binned positive matrix factorization (binPMF) analysis on the complex mass spectra acquired with the Vocus PTR-TOF and identified various emission sources as well as oxidation processes in the atmosphere. Based on separate analysis of low- and high-mass ranges, fifteen PMF factors in the Landes forest and nine PMF factors in the Finnish boreal forest were resolved, showing a high similarity between the two sites. Factors representing monoterpenes dominate the biogenic VOCs in both forests, with less contributions from the isoprene factors and sesquiterpene factors. Particularly, various terpene reaction products were separated into individual PMF factors with varying oxidation degrees, such as lightly oxidized compounds from both monoterpene and sesquiterpene oxidations, monoterpene-derived organic nitrates, and monoterpene more oxidized compounds. These factors display similar mass profiles and diurnal variations between the two sites, revealing similar terpene reaction pathways in these forests. With the distinct characteristics of VOCs and oxygenated VOCs measured by the Vocus PTR-TOF, this study identified various primary emission sources and secondary oxidation processes of atmospheric organic vapors in the European pine forests, providing a more comprehensive understanding of gas-phase atmospheric chemistry.

Haiyan Li et al.

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Haiyan Li et al.

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Data for "Source identification of atmospheric organic vapors in two European pine forests: Results from Vocus PTR-TOF observations" Haiyan Li https://doi.org/10.5281/zenodo.3946644

Haiyan Li et al.

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Short summary
For the first time, we performed binPMF analysis on the complex mass spectra acquired with the Vocus PTR-TOF in two European pine forests and identified various primary emission sources and secondary formation pathways of atmospheric organic vapors, i.e., terpenes and their oxidation products with varying oxidation degrees. This study provides a more comprehensive picture of gas-phase source identifications of organic compounds.
For the first time, we performed binPMF analysis on the complex mass spectra acquired with the...
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