气候变化领域集成服务门户(CCPortal): Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure

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DOI	10.5194/tc-11-2975-2017
	Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure
	Göckede M.; Kittler F.; Jung Kwon M.; Burjack I.; Heimann M.; Kolle O.; Zimov N.; Zimov S.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Hydrologic conditions are a key factor in Arctic ecosystems, with strong influences on ecosystem structure and related effects on biogeophysical and biogeochemical processes. With systematic changes in water availability expected for large parts of the northern high-latitude region in the coming centuries, knowledge on shifts in ecosystem functionality triggered by altered water levels is crucial for reducing uncertainties in climate change predictions. Here, we present findings from paired ecosystem observations in northeast Siberia comprising a drained and a control site. At the drainage site, the water table has been artificially lowered by up to 30ĝ€cm in summer for more than a decade. This sustained primary disturbance in hydrologic conditions has triggered a suite of secondary shifts in ecosystem properties, including vegetation community structure, snow cover dynamics, and radiation budget, all of which influence the net effects of drainage. Reduced thermal conductivity in dry organic soils was identified as the dominating drainage effect on energy budget and soil thermal regime. Through this effect, reduced heat transfer into deeper soil layers leads to shallower thaw depths, initially leading to a stabilization of organic permafrost soils, while the long-term effects on permafrost temperature trends still need to be assessed. At the same time, more energy is transferred back into the atmosphere as sensible heat in the drained area, which may trigger a warming of the lower atmospheric surface layer. © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License.
学科领域	Bowen ratio; climate change; community structure; ecosystem structure; energy budget; energy flux; heat transfer; organic soil; permafrost; snow cover; stabilization; thawing; thermal conductivity; vegetation cover; water availability; water table; Arctic; Siberia
语种	英语
scopus关键词	Bowen ratio; climate change; community structure; ecosystem structure; energy budget; energy flux; heat transfer; organic soil; permafrost; snow cover; stabilization; thawing; thermal conductivity; vegetation cover; water availability; water table; Arctic; Siberia
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119287
作者单位	Max Planck Institute for Biogeochemistry, Jena, Germany; Division of Atmospheric Sciences, Department of Physics, University of Helsinki, Helsinki, Finland; North-East Science Station, Pacific Institute for Geography, Far-Eastern Branch of Russian Academy of Science, Chersky, Russian Federation; Division of Polar Life Sciences, Korea Polar Research Institute, Incheon, South Korea
推荐引用方式 GB/T 7714	Göckede M.,Kittler F.,Jung Kwon M.,et al. Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure[J],2017,11(6).
APA	Göckede M..,Kittler F..,Jung Kwon M..,Burjack I..,Heimann M..,...&Zimov S..(2017).Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure.Cryosphere,11(6).
MLA	Göckede M.,et al."Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure".Cryosphere 11.6(2017).