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Diel Variation of Biogenic Volatile Organic Compound Emissions- A field Study in the Sub, Low and High Arctic on the Effect of Temperature and Light

Lindwall Frida, Faubert Patrick et Rinnan Riikka. (2015). Diel Variation of Biogenic Volatile Organic Compound Emissions- A field Study in the Sub, Low and High Arctic on the Effect of Temperature and Light. PLoS ONE, 10, (4), e0123610.

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URL officielle: http://dx.doi.org/doi:10.1371/journal.pone.0123610

Résumé

Many hours of sunlight in the midnight sun period suggest that significant amounts of biogenic volatile organic compounds (BVOCs) may be released from arctic ecosystems during night-time. However, the emissions from these ecosystems are rarely studied and limited to point measurements during daytime. We measured BVOC emissions during 24-hour periods in the field using a push-pull chamber technique and collection of volatiles in adsorbent cartridges followed by analysis with gas chromatography- mass spectrometry. Five different arctic vegetation communities were examined: high arctic heaths dominated by Salix arctica and Cassiope tetragona, low arctic heaths dominated by Salix glauca and Betula nana and a subarctic peatland dominated by the moss Warnstorfia exannulata and the sedge Eriophorum russeolum. We also addressed how climate warming affects the 24-hour emission and how the daytime emissions respond to sudden darkness. The emissions from the high arctic sites were lowest and had a strong diel variation with almost no emissions during night-time. The low arctic sites as well as the subarctic site had a more stable release of BVOCs during the 24-hour period with night-time emissions in the same range as those during the day. These results warn against overlooking the night period when considering arctic emissions. During the day, the quantity of BVOCs and the number of different compounds emitted was higher under ambient light than in darkness. The monoterpenes α-fenchene, α -phellandrene, 3-carene and α-terpinene as well as isoprene were absent in dark measurements during the day. Warming by open top chambers increased the emission rates both in the high and low arctic sites, forewarning higher emissions in a future warmer climate in the Arctic.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1932-6203
Volume:10
Numéro:4
Pages:e0123610
Version évaluée par les pairs:Oui
Date:2015
Identifiant unique:10.1371/journal.pone.0123610
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:biogenic volatile organic compounds, BVOCs, emission, ecosystems, plants, sunlight, wetlands, atmosphere, chemical synthesis, solar radiation, arctic, climate warming, composés organiques volatils biogéniques, écosystèmes, plantes, lumière du soleil, milieux humides, synthèse chimique, radiation solaire, arctique, réchauffement climatique
Déposé le:21 janv. 2021 01:19
Dernière modification:21 janv. 2021 16:14
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