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Discussion papers
https://doi.org/10.5194/acp-2019-1154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 22 Jan 2020

Submitted as: research article | 22 Jan 2020

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This preprint is currently under review for the journal ACP.

Terpenoid measurements at a Northern wetland revealed a strong source of sesquiterpenes

Heidi Hellén1, Simon Schallhart1, Arnaud P. Praplan1, Toni Tykkä1, Mika Aurela1, Annalea Lohila1,2, and Hannele Hakola1 Heidi Hellén et al.
  • 1Finnish Meteorological Institute, P. O. Box 503, 00101 Helsinki, Finland
  • 2Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, Finland

Abstract. We have studied biogenic VOC emissions and their ambient concentrations at a sub-Arctic wetland (Lompolojänkkä, Finland), which is an open, nutrient-rich sedge fen, and a part of the Pallas-Sodankylä Global Atmosphere Watch (GAW) station. Measurements were conducted during the growing season in 2018 using an in situ thermal desorption – gas chromatograph – mass spectrometer (TD-GC-MS). Earlier studies have shown that isoprene is emitted from boreal wetlands and it turned out to be the most abundant compound in the current study also. Monoterpene (MT) emissions were generally less than 10 % of the isoprene emissions, but sesquiterpenes (SQT) emissions were surprisingly high exceeding MT emissions all the time. During early growing season SQT emission rates were about ten times higher than MT emission rates but this difference became smaller as summer proceeded. Isoprene, MT and SQT emissions were dependent on temperature. Isoprene emission rates were also found to be well-correlated with the gross primary production of CO2. Even with the higher emissions from the wetland, ambient air concentrations of isoprene were clearly lower than MT concentrations. This indicates that wetland was not the only source affecting atmospheric concentrations at the site, but surrounding coniferous forests, which are high MT emitters, contribute as well. In May concentrations of SQTs and MTs at Lompolojänkkä were higher than in earlier boreal forest measurements in southern Finland. At that time the snow cover on the ground was melting and soil thawing and VOCs produced under the snow cover, e.g. by microbes and decaying litter, can be released to the air. Daily mean MT concentrations were very highly negatively correlated with daily mean ozone concentrations indicating that vegetation emissions can be a significant chemical sink of ozone at this sub-Arctic area.

Heidi Hellén et al.

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Short summary
We have studied biogenic VOC emissions and their ambient concentrations at a sub-Arctic wetland. Even though isoprene was the main terpenoid emitted, sesquiterpene emissions were highly significant as well, especially in early summer. This is important since sesquiterpenes have much higher potential to form secondary organic aerosol than isoprene. High sesquiterpene emissions during early summer suggested that melting snow and thawing soil could be an important source of these compounds.
We have studied biogenic VOC emissions and their ambient concentrations at a sub-Arctic wetland....
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