HOME >> BIOLOGY >> NEWS
Catastrophic draining of huge lakes tied to ancient global cooling event

The catastrophic draining of two gigantic glacial lakes in Canada's Hudson Bay region some 8,200 years ago appears to have caused the most abrupt, widespread cold spell on Earth during the last 10,000 years, according to a group of scientists.

Don Barber, a geological sciences doctoral student at the University of Colorado at Boulder, said the lakes, Agassiz and Ojibway, contained more water than all of the Great Lakes combined. Barber and his colleagues estimated that when an ice dam from a remnant of the Laurentide Ice Sheet collapsed, the flow of lake water rushing through the Hudson Strait and into the Labrador Sea was about 15 times greater than the present discharge of the Amazon River.

The fresh water probably gushed into the Labrador Sea in the North Atlantic for about a year, reducing sea-surface salinity and altering ocean circulation patterns at the time, said Barber, also a researcher at CU-Boulder's Institute of Arctic and Alpine Research. Ocean circulation models suggest massive influxes of freshwater can disrupt heat transport in currents flowing from the tropics to temperate regions.

Ice core data taken by scientists in Greenland show temperatures dropped by as much as 15 degrees Fahrenheit in central Greenland and by nearly 6 degrees F in Western Europe following the catastrophic lake drainage. "This was the coldest climate event in the last 10,000 years," Barber said.

A paper on the subject by Barber, published in the July 22 issue of Nature, was co-authored by INSTAAR's John Andrews, Anne Jennings, Mike Kerwin and Mark Morehead. Other co-authors include John Southon of the Lawrence Livermore National Lab in Livermore, Calif., Art Dyke and Roger McNeely of the Geological Survey of Canada, Claude Hillaire-Marcel and Guy Bilodeau of the University of Quebec and Jean-Marc Gagnon of the Canadian Museum of Nature.

The surface currents of the Atlantic act much like conveyor b
'"/>

Contact: Don Barber
barberdc@ucsub.colorado.edu
303-492-7641
University of Colorado at Boulder
21-Jul-1999


Page: 1 2 3

Related biology news :

1. Catastrophic shift in species diversity and productivity of an ecosystem
2. Catastrophic decline of Africas apes, Nature says
3. Dramatic decline of California native frog linked to introduced trout in mountain lakes
4. Lake restrictions make lakeshore property more valuable
5. Water quality in Adirondack lakes responding to acid rain regulations
6. 50 Arctic lakes show dramatic effects of climate warming
7. New England lakes hold clues to lurking storms and floods
8. MIT team probes arsenic and old lakes
9. Signs of recovery in Adirondack lakes apparent, say researchers
10. Water, sediments in ice-bound antarctic lakes may harbor unique microorganisms, ecosystems
11. University of Cincinnati researchers track climate changes in Arctic thaw lakes

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/26/2018)... ... 25, 2018 , ... Maire Mayne, an evidence-based energy healer, ... to reduce inflammation and autoimmune disorders and improve overall immune response. , The ... The following data was reported:,     Over 180% increase in ...
(Date:8/23/2018)... ... August 21, 2018 , ... CRISPR-Cas9 gene editing strategies have ... for the robust functional interrogation of complex biological processes. Gene editing in primary ... the study of the autoimmunity, the understanding of host-pathogen dynamics that drive HIV ...
(Date:8/23/2018)... ... ... Lajollacooks4u is proud to have hosted a variety of groups this year – both new ... Qualcomm, Hewlett Packard, Sequenom and more, have all visited the La Jolla-based venue time and ... the reason clientele return is due to Lajollacooks4u’s signature team-building format, a way for teams ...
Breaking Biology News(10 mins):
(Date:8/31/2018)... ... 2018 , ... A recent expedition led by Dr. Blair ... of Industrial Science, the University of Tokyo, demonstrated how the use of autonomous ... of hard to reach deep sea ecosystems, like intermittently active methane seeps. Thanks ...
(Date:8/29/2018)... ... August 28, 2018 , ... ... announced today the successful completion of a $5.5 million funding round managed by ... Investment Fund, Commenda Capital, and Ellipsis Ventures. , “Our investment in Nanovis is ...
(Date:8/29/2018)... ... August 28, 2018 , ... Inc. Magazine has ... been ranked in 1138th place on the 27th annual Inc. 5000, the most ... represents the most successful companies within the American economy’s most dynamic segment – ...
(Date:8/29/2018)... YORBA LINDA, Calif. (PRWEB) , ... August 28, 2018 , ... ... engineers, and scientists from around the world, is proud to announce the launch of ... events LabRoots offers for a chance to win one of LabRoots most popular shirts. ...
Breaking Biology Technology:
Cached News: