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

Annalena Antonia Lochte (), Janne Repschläger, Markus Kienast, Dieter Garbe-Schönberg, Nils Andersen, Christian Hamann and Ralph Schneider
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Annalena Antonia Lochte: Kiel University
Janne Repschläger: Max Planck Institute for Chemistry
Markus Kienast: Dalhousie University
Dieter Garbe-Schönberg: Kiel University
Nils Andersen: Kiel University
Christian Hamann: Kiel University
Ralph Schneider: Kiel University

Nature Communications, 2019, vol. 10, issue 1, 1-9

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

Date: 2019
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DOI: 10.1038/s41467-019-08408-6

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