Labrador Sea freshening at 8.5 ka BP caused by Hudson Bay Ice Saddle collapse

• DOI: 10.1038/s41467-019-08408-6
• Publication Date: 2019-02-04T11:04:09Z
• Authors: Annalena Antonia ...; Janne Repschläger; Markus Kienast; Dieter Garbe-Schö...; Nils Andersen; Christian Hamann; Ralph Schneider
• Keywords: 13. Climate action; Science; Q; 14. Life underwater; 01 natural sciences; Article; 0105 earth and related environmental sciences

Abstract A significant reduction in the Atlantic Meridional Overturning Circulation and rapid northern Hemisphere cooling 8200 years ago have been linked to final melting of Laurentide Ice Sheet. Although many studies associated this cold event with drainage Lake Agassiz-Ojibway, recent model simulations shown that Hudson Bay Saddle collapse would had much larger effects on than lake outburst itself. Based a combination Mg/Ca oxygen isotope ratios benthic foraminifera, study presents first direct evidence major Labrador shelfwater freshening at 8.5 ka BP, which we associate collapse. The is preceded by subsurface warming western Sea, link strengthening West Greenland Current could concurrently accelerated ice saddle Bay.