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Biogeosciences

Title:		Biogenic volatile organic compound ambient mixing ratios and emission rates in the Alaskan Arctic tundra
Author(s):		Angot H; McErlean K; Hu L; Millet DB; Hueber J; Cui K; Moss J; Wielgasz C; Milligan T; Ketcherside D; Bret-Harte MS; Helmig D;
Address:		"Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA. Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, USA. Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-Saint Paul, MN, USA. Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska, USA"
Journal Title:		Biogeosciences
Year:		2020
Volume:		20201209
Issue:		23
Page Number:		6219 - 6236
DOI:		10.5194/bg-17-6219-2020
ISSN/ISBN:		1726-4170 (Print) 1726-4189 (Electronic) 1726-4170 (Linking)
Abstract:		"Rapid Arctic warming, a lengthening growing season, and the increasing abundance of biogenic volatile-organic-compound-emitting shrubs are all anticipated to increase atmospheric biogenic volatile organic compounds (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 degrees 38' N, 149 degrees 36' W) in northern Alaska during two back-to-back field campaigns (summers of 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 parts per trillion by volume - pptv), while monoterpene and sesquiterpene ambient mixing ratios were respectively close to and below the instrumental quantification limit (~ 2 pptv). Isoprene surface emission rates ranged from 0.2 to 2250 mugC m(-2) h(-1) (mean of 85 mugC m(-2) h(-1)) and monoterpene emission rates remained, on average, below 1 mugC m(-2) h(-1) over the course of the study. 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 degrees C warming, and the MEGAN2.1 temperature algorithm exhibits a close fit with observations for enclosure temperatures in the 0-30 degrees C range. The data presented here provide a baseline for investigating future changes in the BVOC emission potential of the under-studied Arctic tundra environment"
Keywords:
Notes:		"PubMed-not-MEDLINEAngot, Helene McErlean, Katelyn Hu, Lu Millet, Dylan B Hueber, Jacques Cui, Kaixin Moss, Jacob Wielgasz, Catherine Milligan, Tyler Ketcherside, Damien Bret-Harte, M Syndonia Helmig, Detlev eng P20 GM103474/GM/NIGMS NIH HHS/ Germany 2020/01/01 Biogeosciences. 2020; 17(23):6219-6236. doi: 10.5194/bg-17-6219-2020. Epub 2020 Dec 9"