气候变化领域集成服务门户(CCPortal): Volatile organic compound fluxes in a subarctic peatland and lake

CCPortal

DOI	10.5194/acp-20-13399-2020
	Volatile organic compound fluxes in a subarctic peatland and lake
	Seco R.; Holst T.; Sillesen Matzen M.; Westergaard-Nielsen A.; Li T.; Simin T.; Jansen J.; Crill P.; Friborg T.; Rinne J.; Rinnan R.
发表日期	2020
ISSN	16807316
起始页码	13399
结束页码	13416
卷号	20 期号:21
英文摘要	Ecosystems exchange climate-relevant trace gases with the atmosphere, including volatile organic compounds (VOCs) that are a small but highly reactive part of the carbon cycle. VOCs have important ecological functions and implications for atmospheric chemistry and climate.We measured the ecosystem-level surface-atmosphere VOC fluxes using the eddy covariance technique at a shallow subarctic lake and an adjacent graminoid-dominated fen in northern Sweden during two contrasting periods: the peak growing season (mid-July) and the senescent period post-growing season (September-October). In July, the fen was a net source of methanol, acetaldehyde, acetone, dimethyl sulfide, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93±22 μmolm-2 d-1, mean±SE). Isoprene emission was strongly stimulated by temperature and presented a steeper response to temperature (Q10 = 14:5) than that typically assumed in biogenic emission models, supporting the high temperature sensitivity of arctic vegetation. In September, net emissions of methanol and isoprene were drastically reduced, while acetaldehyde and acetone were deposited to the fen, with rates of up to-6:7±2:8 μmolm-2 d-1 for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to -19±1:3 μmolm-2 d-1 of acetone in July and up to-8:5± 2:3 μmolm-2 d-1 of acetaldehyde in September. The deposition of both carbonyl compounds correlated with their atmospheric mixing ratios, with deposition velocities of-0:23± 0:01 and-0:68±0:03 cm s-1 for acetone and acetaldehyde, respectively. Even though these VOC fluxes represented less than 0.5%and less than 5%of the CO2 and CH4 net carbon ecosystem exchange, respectively, VOCs alter the oxidation capacity of the atmosphere. Thus, understanding the response of their emissions to climate change is important for accurate prediction of the future climatic conditions in this rapidly warming area of the planet. © Author(s) 2020.
语种	英语
scopus关键词	atmospheric chemistry; atmospheric deposition; atmospheric pollution; biogenic emission; deposition; eddy covariance; lake water; peatland; subarctic region; volatile organic compound; warming; Sweden
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152834
作者单位	Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, Denmark; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm, Sweden
推荐引用方式 GB/T 7714	Seco R.,Holst T.,Sillesen Matzen M.,et al. Volatile organic compound fluxes in a subarctic peatland and lake[J],2020,20(21).
APA	Seco R..,Holst T..,Sillesen Matzen M..,Westergaard-Nielsen A..,Li T..,...&Rinnan R..(2020).Volatile organic compound fluxes in a subarctic peatland and lake.Atmospheric Chemistry and Physics,20(21).
MLA	Seco R.,et al."Volatile organic compound fluxes in a subarctic peatland and lake".Atmospheric Chemistry and Physics 20.21(2020).