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Laurentide Ice Sheet Retreat during the Younger Dryas: Central Upper Peninsula of Michigan, USA
Walters, Kent A

2013, MS, University of Cincinnati, Arts and Sciences: Geology.
The response of ice sheets to climate change is of concern because of meltwater introduction to the oceans raising sea level. Yet it is uncertain how the Laurentide Ice Sheet (LIS) responded to the widely studied Younger Dryas (YD) cold interval (~12.9-11.6 cal ka BP). In northwestern Wisconsin and the Upper Peninsula of Michigan, two sites record advances of the LIS before and near the end of the YD. The Two Creeks (~13.7 cal ka BP) and Lake Gribben (~11.6 cal ka BP) forest beds indicate that the ice sheet margin was between those sites during the YD. New geomorphic mapping and synthesis of existing and new chronology for the ice margin, document activity of the ice sheet during the YD. Combined, these data indicate that the ice sheet margin had at least six stationary positions during retreat through the YD interval and a readvance after the YD. When this pattern is compared to the isotopic record from the Greenland ice core, an apparent conflict arises. The ice sheet is retreating at a time generally thought to be cold and correlating with glacial advances. This may imply that seasonality and the corresponding warmer summers during the YD controlled the ice sheet response. Alternatively they may imply caution is needed when interpreting the ice core record.
Thomas Lowell, Ph.D. (Committee Chair)
Timothy Gordon Fisher, Ph.D. (Committee Member)
David Byer Nash, Ph.D. (Committee Member)
78 p.

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Walters, K. (2013). Laurentide Ice Sheet Retreat during the Younger Dryas: Central Upper Peninsula of Michigan, USA. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Walters, Kent. "Laurentide Ice Sheet Retreat during the Younger Dryas: Central Upper Peninsula of Michigan, USA." Electronic Thesis or Dissertation. University of Cincinnati, 2013. OhioLINK Electronic Theses and Dissertations Center. 13 Nov 2018.

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Walters, Kent "Laurentide Ice Sheet Retreat during the Younger Dryas: Central Upper Peninsula of Michigan, USA." Electronic Thesis or Dissertation. University of Cincinnati, 2013. https://etd.ohiolink.edu/

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