DOI: 10.5194/tc-11-2975-2017
Scopus记录号: 2-s2.0-85038635204
论文题名: Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure
作者: Göckede M ; , Kittler F ; , Jung Kwon M ; , Burjack I ; , Heimann M ; , Kolle O ; , Zimov N ; , Zimov S
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 6 起始页码: 2975
结束页码: 2996
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75456
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
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]. Cryosphere,2017-01-01,11(6)