title: Abrupt drainage cycles of the Fennoscandian Ice Sheet.
abstract: 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.
authors.affiliation: Aix Marseille Université, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Collège de France, 13545 Aix-en-Provence Cedex 04, France. soulet@cerege.fr
authors.forename: Guillaume
authors.initials: G
authors.lastname: Soulet
authors.forename: Guillemette
authors.initials: G
authors.lastname: Ménot
authors.forename: Germain
authors.initials: G
authors.lastname: Bayon
authors.forename: Frauke
authors.initials: F
authors.lastname: Rostek
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Ponzevera
authors.forename: Samuel
authors.initials: S
authors.lastname: Toucanne
authors.forename: Gilles
authors.initials: G
authors.lastname: Lericolais
authors.forename: Edouard
authors.initials: E
authors.lastname: Bard
mesh_terms: D059038:Black Sea; D002244:Carbon / Q000032:analysis; D005387:Finland; D005615:Freezing; D019015:Geologic Sediments / Q000032:analysis; D046448:Ice Cover / Q000737:chemistry*; D009354:Neodymium / Q000032:analysis; D045483:Rivers; D012537:Scandinavian and Nordic Countries; D014872:Water Movements
chemical_list: D009354:Neodymium; D002244:Carbon