Volatile Organic Compound fluxes in a subarctic peatland and lake

doi:10.5194/acp-2020-595

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-595
	Volatile Organic Compound fluxes in a subarctic peatland and lake
	Roger Seco, Thomas Holst, Mikkel Sillesen Matzen, Andreas Westergaard-Nielsen, Tao Li, Tihomir Simin, Joachim Jansen, Patrick Crill, Thomas Friborg, Janne Rinne, and Riikka Rinnan
	2020-07-20
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
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, DMS, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93 ± 22 µmol m⁻² day⁻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 µmol m⁻² day⁻¹ for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to −19 ± 1.3 µmol m⁻² day⁻¹ of acetone in July and up to −8.5 ± 2.3 µmol m⁻² day⁻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.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/286751
专题	地球科学
推荐引用方式 GB/T 7714	Roger Seco, Thomas Holst, Mikkel Sillesen Matzen, Andreas Westergaard-Nielsen, Tao Li, Tihomir Simin, Joachim Jansen, Patrick Crill, Thomas Friborg, Janne Rinne, and Riikka Rinnan. Volatile Organic Compound fluxes in a subarctic peatland and lake[J]. Atmospheric Chemistry and Physics,2020.
APA	Roger Seco, Thomas Holst, Mikkel Sillesen Matzen, Andreas Westergaard-Nielsen, Tao Li, Tihomir Simin, Joachim Jansen, Patrick Crill, Thomas Friborg, Janne Rinne, and Riikka Rinnan.(2020).Volatile Organic Compound fluxes in a subarctic peatland and lake.Atmospheric Chemistry and Physics.
MLA	Roger Seco, Thomas Holst, Mikkel Sillesen Matzen, Andreas Westergaard-Nielsen, Tao Li, Tihomir Simin, Joachim Jansen, Patrick Crill, Thomas Friborg, Janne Rinne, and Riikka Rinnan."Volatile Organic Compound fluxes in a subarctic peatland and lake".Atmospheric Chemistry and Physics (2020).