Identification of Younger Dryas outburst flood path from Lake Agassiz to the Arctic Ocean

  title={Identification of Younger Dryas outburst flood path from Lake Agassiz to the Arctic Ocean},
  author={Julian B. Murton and Mark D. Bateman and S. R. Dallimore and James T. Teller and Zhirong Yang},
The melting Laurentide Ice Sheet discharged thousands of cubic kilometres of fresh water each year into surrounding oceans, at times suppressing the Atlantic meridional overturning circulation and triggering abrupt climate change. Understanding the physical mechanisms leading to events such as the Younger Dryas cold interval requires identification of the paths and timing of the freshwater discharges. Although Broecker et al. hypothesized in 1989 that an outburst from glacial Lake Agassiz… 

Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling

A period of cooling about 13,000 years ago interrupted about 2,000 years of deglacial warming. Known as the Younger Dryas (YD), the event is thought to have resulted from a slowdown of the Atlantic

Arctic drainage of Laurentide Ice Sheet meltwater throughout the past 14,700 years

During the last deglaciation substantial volumes of meltwater from the decaying Laurentide Ice Sheet were supplied to the Arctic, Gulf of Mexico and North Atlantic along different drainage routes,

Lake Agassiz during the Younger Dryas

  • J. Teller
  • Environmental Science, Geography
    Quaternary Research
  • 2013

Catastrophic Drainage From the Northwestern Outlet of Glacial Lake Agassiz During the Younger Dryas

Catastrophic meltwater drainage from glacial Lake Agassiz has been hypothesized as a trigger for large‐scale ocean circulation change initiating the Younger Dryas cold reversal. Here we quantify the

Arctic sea ice export as a driver of deglacial climate

A widespread theory in paleoclimatology suggests that changes in freshwater discharge to the Nordic (Greenland, Norwegian, and Icelandic) Seas from ice sheets and proglacial lakes over North America

Meltwater routing and the Younger Dryas

It is concluded that meltwater discharge from the Arctic, rather than the St. Lawrence Valley, was more likely to have triggered the Younger Dryas cooling.

Opening of glacial Lake Agassiz’s eastern outlets by the start of the Younger Dryas cold period

The Younger Dryas (12.9 ± 0.1 to 11.7 ± 0.1 ka) was a return to cold conditions in the Northern Hemisphere during the last deglaciation. This climatic event was hypothesized to have been caused by a

Enhanced sea-ice export from the Arctic during the Younger Dryas.

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 is supported.



Routing of meltwater from the Laurentide Ice Sheet during the Younger Dryas cold episode

ROOTH1 proposed that the Younger Dryas cold episode, which chilled the North Atlantic region from 11,000 to 10,000 yr BP, was initiated by a diversion of meltwater from the Mississippi drainage to

Arctic freshwater forcing of the Younger Dryas cold reversal

An ensemble of simulations of the drainage chronology of the North American ice sheet is analysed in order to identify the geographical release points of freshwater forcing during deglaciation and finds that the largest combined meltwater/iceberg discharge was directed into the Arctic Ocean.

Glacial Lake Agassiz: The northwestern outlet and paleoflood

Valley morphology and sediment in the Fort McMurray region of Alberta indicate that a catastrophic flood discharged down the lower Clearwater and Athabasca river valleys 9900 yr B.P. Geomorphic and

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event

The Younger Dryas cold interval represents a time when much of the Northern Hemisphere cooled from ≈12.9 to 11.5 kiloyears B.P. The cause of this event, which has long been viewed as the canonical