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The 8.2-ka abrupt climate change event in Brown's Lake, northeast Ohio

Published online by Cambridge University Press:  20 January 2017

Brian Lutz ,
Gregory Wiles ,
Thomas Lowell  and
Joshua Michaels
Brian Lutz*
Affiliation:
Department of Geology, The College of Wooster, 1189 Beall Ave., Wooster, OH 44691, USA
Gregory Wiles
Affiliation:
Department of Geology, The College of Wooster, 1189 Beall Ave., Wooster, OH 44691, USA
Thomas Lowell
Affiliation:
Department of Geology, University of Cincinnati, P.O. Box 0013, Cincinnati, OH 45221, USA
Joshua Michaels
Affiliation:
Department of Geology, University of Cincinnati, P.O. Box 0013, Cincinnati, OH 45221, USA
*
⁎Corresponding author. E-mail address:Brian.D.Lutz@gmail.com (B. Lutz).
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Abstract

Many Northern Hemisphere paleoclimatic records, including ice cores, speleothems, lake sediments, ocean cores and glacier chronologies, indicate an abrupt cooling event about 8200 cal yr BP. A new well-dated series of sediment cores taken from Brown's Lake, a kettle in Northeast Ohio, shows two closely spaced intervals of loess deposition during this time period. The source of loess is uncertain; however, it is likely from an abandoned drainage and former glacial lake basin located to the north of the stagnant ice topography that gave rise to the kettle lake. Strong visual stratigraphy, loss on ignition data and sediment grain size analyses dated with 3 AMS radiocarbon dates place the two intervals of loess deposition between 8950 and 8005 cal yr BP. The possibility of a two-phase abrupt climate change at this time is a finding that has been suggested in other research. This record adds detail to the spatial extent and timing as well as possible structure of the 8.2-ka abrupt climate change event.

Keywords

Abrupt climate change8.2-ka eventLoessLakesHolocene climate change
Type
Short Paper
Information
Quaternary Research , Volume 67 , Issue 2 , March 2007 , pp. 292 - 296
Copyright
University of Washington

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