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Changes in the Bathymetry and Volume of Glacial Lake Agassiz Between 11,000 and 9300 14C yr B.P.

Published online by Cambridge University Press:  20 January 2017

David W. Leverington ,
Jason D. Mann  and
James T. Teller
David W. Leverington
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Jason D. Mann
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
James T. Teller
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
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Abstract

The volume and surface area of glacial Lake Agassiz varied considerably during its 4000-year history. Computer models for seven stages of Lake Agassiz were used to quantify these variations over the lake's early history, between about 11,000 and 9300 14C yr B.P. (ca. 13,000 to 10,300 cal yr B.P.). Just after formation of the Herman strandlines (ca. 11,000 14C yr B.P.), the volume of Lake Agassiz appears to have decreased by >85% as a consequence of the abrupt rerouting of overflow to its eastern outlet from its southward routing into the Mississippi River basin. This drainage released about 9500 km3 of water into the North Atlantic Ocean via the Great Lakes and Gulf of St. Lawrence. Following closure of this eastern routing of overflow, the lake reached its maximum size at about 9400 14C yr B.P. with an area of >260,000 km2 and a volume of >22,700 km3. A second major reduction in volume occurred shortly after that, when its volume decreased >10% following the opening of the Kaiashk outlet to the east into the Great Lakes, and 2500–7000 km3 of water was released into the North Atlantic Ocean. These discharges may have affected ocean circulation and North Atlantic Deep Water production.

Keywords

Lake Agassizbathymetryvolumecomputer model
Type
Research Article
Information
Quaternary Research , Volume 54 , Issue 2 , September 2000 , pp. 174 - 181
Copyright
University of Washington

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