Doubled volatile organic compound emissions from subarctic tundra under simulated climate warming

Authors

  • Patrick Faubert,

    1. Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211 Kuopio, Finland
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  • Päivi Tiiva,

    1. Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211 Kuopio, Finland
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  • Åsmund Rinnan,

    1. Quality & Technology, Department of Food Science, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark
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  • Anders Michelsen,

    1. Terrestrial Ecology Section, Department of Biology, Faculty of Science, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark
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  • Jarmo K. Holopainen,

    1. Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211 Kuopio, Finland
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  • Riikka Rinnan

    1. Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211 Kuopio, Finland
    2. Terrestrial Ecology Section, Department of Biology, Faculty of Science, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark
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Author for correspondence:
Patrick Faubert
Tel: +358 40 355 3204
E-mail: patrick.faubert@uef.fi

Summary

  • Biogenic volatile organic compound (BVOC) emissions from arctic ecosystems are important in view of their role in global atmospheric chemistry and unknown feedbacks to global warming. These cold ecosystems are hotspots of climate warming, which will be more severe here than averaged over the globe. We assess the effects of climatic warming on non-methane BVOC emissions from a subarctic heath.
  • We performed ecosystem-based chamber measurements and gas chromatography–mass spectrometry (GC-MS) analyses of the BVOCs collected on adsorbent over two growing seasons at a wet subarctic tundra heath hosting a long-term warming and mountain birch (Betula pubescens ssp. czerepanovii) litter addition experiment.
  • The relatively low emissions of monoterpenes and sesquiterpenes were doubled in response to an air temperature increment of only 1.9–2.5°C, while litter addition had a minor influence. BVOC emissions were seasonal, and warming combined with litter addition triggered emissions of specific compounds.
  • The unexpectedly high rate of release of BVOCs measured in this conservative warming scenario is far above the estimates produced by the current models, which underlines the importance of a focus on BVOC emissions during climate change. The observed changes have implications for ecological interactions and feedback effects on climate change via impacts on aerosol formation and indirect greenhouse effects.

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