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DOI	10.5194/tc-14-1857-2020
	The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints
	Gavrilov A.; Gavrilov A.; Pavlov V.; Fridenberg A.; Boldyrev M.; Khilimonyuk V.; Khilimonyuk V.; Pizhankova E.; Pizhankova E.; Buldovich S.; Buldovich S.; Kosevich N.; Kosevich N.; Alyautdinov A.; Alyautdinov A.; Ogienko M.; Ogienko M.; Roslyakov A.; Roslyakov A.; Cherbunina M.; Cherbunina M.; Ospennikov E.; Ospennikov E.
发表日期	2020
ISSN	19940416
起始页码	1857
结束页码	1873
卷号	14 期号:6
英文摘要	The evolution of permafrost on the Kara shelf is reconstructed for the past 125kyr. The work includes zoning of the shelf according to geological history; compiling sea level and ground temperature scenarios within the distinguished zones; and modeling to evaluate the thickness of permafrost and the distribution of frozen, cooled and thawed deposits. Special attention is given to the scenarios of the evolution of ground temperature in key stages of history that determined the current state of the Kara shelf permafrost zone: characterization of the extensiveness and duration of the existence of the sea during stage 3 of the marine oxygen isotope stratigraphy (MIS-3), the spread of glaciation and dammed basins in MIS-2. The present shelf is divided into areas of continuous, discontinuous-to-sporadic and sporadic permafrost. Cooled deposits occur at the western and northwestern water zones and correspond to areas of MIS-2 glaciation. Permafrost occurs in the periglacial domain that is within a zone of modern sea depth from 0 to 100m, adjacent to the continent. The distribution of permafrost is mostly sporadic in the southwest of this zone, while it is mostly continuous in the northeast. The thickness of permafrost does not exceed 100m in the southeast and ranges from 100 to 300m in the northeast. Thawed deposits are confined to the estuaries of large rivers and the deepwater part of the St. Anna trench. The modeling results are correlated to the available field data and are presented as a geocryological map. The formation of frozen, cooled and thawed deposits of the region is inferred to depend on the spread of ice sheets, sea level, and duration of shelf freezing and thawing periods. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	deep water; freeze-thaw cycle; freezing; frozen ground; glaciation; ice sheet; marine isotope stage; oxygen isotope; periglacial landform; permafrost; reconstruction; sea level; surface temperature; water depth; Arctic Ocean; Kara Sea; Anna
语种	英语
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/202081
作者单位	Faculty of Geology, Lomonosov Moscow State University, Moscow, Russian Federation; Faculty of Geography, Lomonosov Moscow State University, Moscow, Russian Federation; National Intellectual Resource Foundation, Moscow, Russian Federation; Rosneft Oil Company, Moscow, Russian Federation; Arctic Research Center LLC, Moscow, Russian Federation
推荐引用方式 GB/T 7714	Gavrilov A.,Gavrilov A.,Pavlov V.,et al. The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints[J],2020,14(6).
APA	Gavrilov A..,Gavrilov A..,Pavlov V..,Fridenberg A..,Boldyrev M..,...&Ospennikov E..(2020).The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints.Cryosphere,14(6).
MLA	Gavrilov A.,et al."The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints".Cryosphere 14.6(2020).