气候变化领域集成服务门户(CCPortal): Retrogressive Thaw Slumps on Ice-Rich Permafrost Under Degradation: Results From a Large-Scale Laboratory Simulation

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DOI	10.1029/2020GL091070
	Retrogressive Thaw Slumps on Ice-Rich Permafrost Under Degradation: Results From a Large-Scale Laboratory Simulation
	Costard F.; Dupeyrat L.; Séjourné A.; Bouchard F.; Fedorov A.; Saint-Bézar B.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:1
英文摘要	In the ice-rich permafrost of the Arctic regions, thermokarst erosion on slopes induces the formation of large-scale retrogressive thaw slumps (RTS). They have significant geomorphological, hydrological, and biogeochemical impacts on the landscape. Further research is thus needed to better understand the respective effect of ice content and permafrost heterogeneities on the dynamics of these erosional features. Here, we present results of a full-scale physical modeling of RTS development in a cold room. The experimental setup was designed to simulate and compare two ground-ice settings (ice wedges, icy layers) with the thawing of ice-poor permafrost (i.e., reference model). Our results show that the melting of the icy layers induces a loss of decohesion of the overlapping frozen soil. The heterogeneous frozen soil with ice wedges needs a longer time until degradation, but undergoes a stronger and faster decohesion of its structure during the thawing phase. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Erosion; Permafrost; Thawing; Arctic regions; Biogeochemical; De-cohesion; Full-scale physical modeling; Ice content; Ice-rich permafrost; Laboratory simulation; Reference modeling; Ice
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169231
作者单位	Géoscience Paris Sud (GEOPS), CNRS/Université Paris-SaclayOrsay, France; Melnikov Permafrost Institute, Russian Academy of Sciences, Yakutsk, Russian Federation
推荐引用方式 GB/T 7714	Costard F.,Dupeyrat L.,Séjourné A.,et al. Retrogressive Thaw Slumps on Ice-Rich Permafrost Under Degradation: Results From a Large-Scale Laboratory Simulation[J],2021,48(1).
APA	Costard F.,Dupeyrat L.,Séjourné A.,Bouchard F.,Fedorov A.,&Saint-Bézar B..(2021).Retrogressive Thaw Slumps on Ice-Rich Permafrost Under Degradation: Results From a Large-Scale Laboratory Simulation.Geophysical Research Letters,48(1).
MLA	Costard F.,et al."Retrogressive Thaw Slumps on Ice-Rich Permafrost Under Degradation: Results From a Large-Scale Laboratory Simulation".Geophysical Research Letters 48.1(2021).