The Younger Dryas cold spell of the last deglaciation and related slowing of the Atlanticmeridional overturning circulation have been linked to a large array of processes, notably aninflux 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 LomonosovRidge, in the central Arctic ocean marked by a pulse in detrital dolomitic-limestones. Thispoints to an Arctic-Canadian sediment source area with about fivefold higher Younger Dryasice-rafting deposition rate, in comparison with the Holocene. our findings thus support thehypothesis of a glacial drainage event in the Canadian Arctic area, at the onset of the YoungerDryas, enhancing sea-ice production and drifting through the Arctic, then export through Framstrait, towards Atlantic meridional overturning circulation sites of the northern north Atlantic.
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