The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints
The evolution of permafrost on the Kara shelf is reconstructed for the past 125 kyr. 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 th...
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ftcopernicus:oai:publications.copernicus.org:tc76566 2023-05-15T16:37:09+02:00 The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints Gavrilov, Anatoliy Pavlov, Vladimir Fridenberg, Alexandr Boldyrev, Mikhail Khilimonyuk, Vanda Pizhankova, Elena Buldovich, Sergey Kosevich, Natalia Alyautdinov, Ali Ogienko, Mariia Roslyakov, Alexander Cherbunina, Maria Ospennikov, Evgeniy 2020-06-11 application/pdf https://doi.org/10.5194/tc-14-1857-2020 https://tc.copernicus.org/articles/14/1857/2020/ eng eng doi:10.5194/tc-14-1857-2020 https://tc.copernicus.org/articles/14/1857/2020/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-14-1857-2020 2020-07-20T16:22:06Z The evolution of permafrost on the Kara shelf is reconstructed for the past 125 kyr. 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 100 m, 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 100 m in the southeast and ranges from 100 to 300 m 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. Text Ice Kara Sea permafrost Copernicus Publications: E-Journals Kara Sea The Cryosphere 14 6 1857 1873 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The evolution of permafrost on the Kara shelf is reconstructed for the past 125 kyr. 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 100 m, 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 100 m in the southeast and ranges from 100 to 300 m 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. |
format |
Text |
author |
Gavrilov, Anatoliy Pavlov, Vladimir Fridenberg, Alexandr Boldyrev, Mikhail Khilimonyuk, Vanda Pizhankova, Elena Buldovich, Sergey Kosevich, Natalia Alyautdinov, Ali Ogienko, Mariia Roslyakov, Alexander Cherbunina, Maria Ospennikov, Evgeniy |
spellingShingle |
Gavrilov, Anatoliy Pavlov, Vladimir Fridenberg, Alexandr Boldyrev, Mikhail Khilimonyuk, Vanda Pizhankova, Elena Buldovich, Sergey Kosevich, Natalia Alyautdinov, Ali Ogienko, Mariia Roslyakov, Alexander Cherbunina, Maria Ospennikov, Evgeniy The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
author_facet |
Gavrilov, Anatoliy Pavlov, Vladimir Fridenberg, Alexandr Boldyrev, Mikhail Khilimonyuk, Vanda Pizhankova, Elena Buldovich, Sergey Kosevich, Natalia Alyautdinov, Ali Ogienko, Mariia Roslyakov, Alexander Cherbunina, Maria Ospennikov, Evgeniy |
author_sort |
Gavrilov, Anatoliy |
title |
The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
title_short |
The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
title_full |
The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
title_fullStr |
The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
title_full_unstemmed |
The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints |
title_sort |
current state and 125 kyr history of permafrost on the kara sea shelf: modeling constraints |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-1857-2020 https://tc.copernicus.org/articles/14/1857/2020/ |
geographic |
Kara Sea |
geographic_facet |
Kara Sea |
genre |
Ice Kara Sea permafrost |
genre_facet |
Ice Kara Sea permafrost |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-14-1857-2020 https://tc.copernicus.org/articles/14/1857/2020/ |
op_doi |
https://doi.org/10.5194/tc-14-1857-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
1857 |
op_container_end_page |
1873 |
_version_ |
1766027452823371776 |