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

TY - JOUR

T1 - Doubled volatile organic compound emissions from subarctic tundra under simulated climate warming

AU - Faubert, Patrick

AU - Tiiva, Paivi

AU - Rinnan, Åsmund

AU - Michelsen, Anders

AU - Holopainen, Jarmo K

AU - Rinnan, Riikka

N1 - Keywords:climate warming;heath;litter;monoterpene;sesquiterpene;Subarctic;tundra;volatile organic compound

PY - 2010/7

Y1 - 2010/7

N2 - • 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.

AB - • 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.

KW - Faculty of Science

KW - planter

KW - økologi

KW - arktis

KW - jord

KW - plants

KW - ecology

KW - arctic

KW - soil

U2 - 10.1111/j.1469-8137.2010.03270.x

DO - 10.1111/j.1469-8137.2010.03270.x

M3 - Journal article

C2 - 20456056

SN - 0028-646X

VL - 187

SP - 199

EP - 208

JO - New Phytologist

JF - New Phytologist

IS - 1

ER -