The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraints

Gavrilov, A.; Pavlov, V.; Fridenberg, A.; Boldyrev, M.; Khilimonyuk, V.; Pizhankova, E.; Buldovich, S.; Kosevich, N.; Alyautdinov, A.; Ogienko, M.; Roslyakov, A.; Cherbunina, M.; Ospennikov, E.

Авторы: 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
Журнал: The Cryosphere
Том: 14
Номер: 6
Год издания: 2020
Издательство: Copernicus Group
Местоположение издательства: Germany
Первая страница: 1857
Последняя страница: 1873
DOI: 10.5194/tc-14-1857-2020
Аннотация: 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.
Добавил в систему: Чербунина Мария Юрьевна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ИНХС РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ИНХС РАН

The current state and 125 kyr history of permafrost on the Kara Sea shelf: modeling constraintsстатья Исследовательская статья Электронная публикация

Прикрепленные файлы