globalchange  > 气候变化与战略
DOI: 10.5194/tc-14-1857-2020
论文题名:
The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints
作者: 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.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期:6
起始页码: 1857
结束页码: 1873
语种: 英语
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164459
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Gavrilov A.,Gavrilov A.,Pavlov V.,et al. The current state and 125kyr history of permafrost on the Kara Sea shelf: Modeling constraints[J]. Cryosphere,2020-01-01,14(6)
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