title: Enhanced sea-ice export from the Arctic during the Younger Dryas.
abstract: The Younger Dryas cold spell of the last deglaciation and related slowing of the Atlantic meridional overturning circulation have been linked to a large array of processes, notably an influx of fresh water into the North Atlantic related to partial drainage of glacial Lake Agassiz. Here we observe a major drainage event, in marine sediment cores raised from the Lomonosov Ridge, in the central Arctic Ocean marked by a pulse in detrital dolomitic-limestones. This points to an Arctic-Canadian sediment source area with about fivefold higher Younger Dryas ice-rafting deposition rate, in comparison with the Holocene. Our findings thus support the hypothesis of a glacial drainage event in the Canadian Arctic area, at the onset of the Younger Dryas, enhancing sea-ice production and drifting through the Arctic, then export through Fram Strait, towards Atlantic meridional overturning circulation sites of the northern North Atlantic.
authors.affiliation: GEOTOP, Université du Québec à Montréal, C.P. 8888 Succ. Centre-Ville, Montréal, Quebec H3C 3P8, Canada.
authors.forename: Christelle
authors.initials: C
authors.lastname: Not
authors.forename: Claude
authors.initials: C
authors.lastname: Hillaire-Marcel
mesh_terms: D000818:Animals; D001110:Arctic Regions; D002170:Canada; D056908:Foraminifera / Q000502:physiology; D005843:Geography; D019015:Geologic Sediments; D007053:Ice; D046448:Ice Cover; D012623:Seawater; D013997:Time Factors; D014872:Water Movements; D014961:X-Ray Diffraction
chemical_list: D007053:Ice