Data/hora: 11/06/2024 08:06:40

Provedor de dados: | 5
País: | France
Título: | Abrupt drainage cycles of the Fennoscandian Ice Sheet
Autores: | Soulet, Guillaume; Menot, Guillemette; Bayon, Germain; Rostek, Frauke; Ponzevera, Emmanuel; Toucanne, Samuel; Lericolais, Gilles; Bard, Edouard.
Data: | 2013-04
Ano: | 2013
Palavras-chave: | Ice dynamics; Meltwater routing; European hydrographic network.
Resumo: | Continental ice sheets are a key component of the Earth’s climate system, but their internal dynamics need to be further studied. Since the last deglaciation, the northern Eurasian Fennoscandian Ice Sheet (FIS) has been connected to the Black Sea (BS) watershed, making this basin a suitable location to investigate former ice-sheet dynamics. Here, from a core retrieved in the BS, we combine the use of neodymium isotopes, high-resolution elemental analysis, and biomarkers to trace changes in sediment provenance and river runoff. We reveal cyclic releases of meltwater originating from Lake Disna, a proglacial lake linked to the FIS during Heinrich Stadial 1. Regional interactions within the climate–lake–FIS system, linked to changes in the availability of subglacial water, led to abrupt drainage cycles of the FIS into the BS watershed. This phenomenon raised the BS water level by ∼100 m until the sill of the Bosphorus Strait was reached, flooding the vast northwestern BS shelf and deeply affecting the hydrology and circulation of the BS and, probably, of the Marmara and Aegean Seas.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00134/24489/22516.pdf

DOI:10.1073/pnas.1214676110

Editor: | Natl Acad Sciences
Relação: | http://archimer.ifremer.fr/doc/00134/24489/
Formato: | application/pdf
Fonte: | Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Natl Acad Sciences), 2013-04 , Vol. 110 , N. 17 , P. 6682-6687
Fonte: | © 2013 National Academy of Sciences