- Marc Caffee - Purdue U.
GRADUATE STUDENT
- Dave Ullman
PUBLICATIONS (RELATED)
| ONSET OF THE LAST DEGLACIATION IN WISCONSIN | |||||||
| Determining the phasing of Northern Hemisphere ice sheets relative to changes in insolation, greenhouse gases, and climate is key to understanding the mechanisms that give rise to ice ages and ice-sheet retreat. Early retreat of Northern Hemisphere ice sheets ~19-24 ka suggests boreal insolation as the ultimate driver of ice retreat. Alternatively, tropical sea surface temperatures and atmospheric CO2 may lead portions of ice-sheet retreat, implicating them as the ultimate driver of deglaciation. We are testing the boreal summer insolation hypothesis by dating retreat of the southern Laurentide Ice Sheet (LIS) in Wisconsin using in-situ cosmogenic nuclide. We will compare results against other LIS chronologies and new energy-balance LIS model simulations. If the LIS chronology in WI is synchronous with other portions of LIS retreat and the energy-balance model predicts a negative mass balance by that time, then boreal summer insolation is the likely driver of deglaciation. | |||||||
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COLLABORATORS
GRADUATE STUDENT
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