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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/bg-2020-235
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-235
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  17 Jul 2020

17 Jul 2020

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A revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Biogenic volatile organic compound ambient mixing ratios and emission rates in the Alaskan Arctic tundra

Hélène Angot1, Katelyn McErlean1, Lu Hu2, Dylan B. Millet3, Jacques Hueber1, Kaixin Cui1, Jacob Moss1, Catherine Wielgasz2, Tyler Milligan1, Damien Ketcherside2, Marion Syndonia Bret-Harte4, and Detlev Helmig1 Hélène Angot et al.
  • 1Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA
  • 2Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, USA
  • 3Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-Saint Paul, MN, USA
  • 4Institute of Arctic Biology, University of Alaska-Fairbanks, Fairbanks, Alaska, USA

Abstract. Rapid Arctic warming, a lengthening growing season, and increasing abundance of biogenic volatile organic compounds (BVOC)-emitting shrubs are all anticipated to increase atmospheric BVOCs in the Arctic atmosphere, with implications for atmospheric oxidation processes and climate feedbacks. Quantifying these changes requires an accurate understanding of the underlying processes driving BVOC emissions in the Arctic. While boreal ecosystems have been widely studied, little attention has been paid to Arctic tundra environments. Here, we report terpenoid (isoprene, monoterpenes, and sesquiterpenes) ambient mixing ratios and emission rates from key dominant vegetation species at Toolik Field Station (TFS; 68°38' N, 149°36' W) in northern Alaska during two back-to-back field campaigns (summers 2018 and 2019) covering the entire growing season. Isoprene ambient mixing ratios observed at TFS fell within the range of values reported in the Eurasian taiga (0–500 pptv), while monoterpene and sesquiterpene ambient mixing ratios were respectively close to and below the instrumental quantification limit (~ 2 pptv). We further quantified the temperature dependence of isoprene emissions from local vegetation including Salix spp. (a known isoprene emitter), and compared the results to predictions from the Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1). Our observations suggest a 180–215 % emission increase in response to a 3–4 °C warming. The MEGAN2.1 temperature algorithm exhibits a close fit with observations for enclosure temperatures below 30 °C. Above 30 °C, MEGAN2.1 predicts an isoprene emission plateau that is not observed in the enclosure flux measurements at TFS. More studies are needed to better constrain the warming response of isoprene and other BVOCs for a wide range of Arctic species.

Hélène Angot et al.

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Hélène Angot et al.

Hélène Angot et al.

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