Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation

Research Article| January 01, 2015 Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation David J. Ullman; David J. Ullman * 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA *E-mail: dullman@coas.oregonstate.edu Search for other works by this author on: GSW Google Scholar Anders E. Carlson; Anders E. Carlson 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Allegra N. LeGrande; Allegra N. LeGrande 3NASA Goddard Institute for Space Studies & Center for Climate System Research, Columbia University, New York, New York 10025, USA Search for other works by this author on: GSW Google Scholar Faron S. Anslow; Faron S. Anslow 4Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC V8W 2Y2, Canada Search for other works by this author on: GSW Google Scholar Angus K. Moore; Angus K. Moore 2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA5Department of Earth, Atmospheric, and Planetary Science, Purdue University, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar Marc Caffee; Marc Caffee 6Department of Physics, Purdue Rare Isotope Measurement (PRIME) Laboratory, Purdue University, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar Kent M. Syverson; Kent M. Syverson 7Department of Geology, University of Wisconsin–Eau Claire, Eau Claire, Wisconsin 54701, USA Search for other works by this author on: GSW Google Scholar Joseph M. Licciardi Joseph M. Licciardi 8Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824, USA Search for other works by this author on: GSW Google Scholar Author and Article Information David J. Ullman * 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA Anders E. Carlson 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA Allegra N. LeGrande 3NASA Goddard Institute for Space Studies & Center for Climate System Research, Columbia University, New York, New York 10025, USA Faron S. Anslow 4Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC V8W 2Y2, Canada Angus K. Moore 2Department of Geoscience, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA5Department of Earth, Atmospheric, and Planetary Science, Purdue University, West Lafayette, Indiana 47907, USA Marc Caffee 6Department of Physics, Purdue Rare Isotope Measurement (PRIME) Laboratory, Purdue University, West Lafayette, Indiana 47907, USA Kent M. Syverson 7Department of Geology, University of Wisconsin–Eau Claire, Eau Claire, Wisconsin 54701, USA Joseph M. Licciardi 8Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824, USA *E-mail: dullman@coas.oregonstate.edu Publisher: Geological Society of America Received: 13 Aug 2014 Revision Received: 07 Oct 2014 Accepted: 10 Oct 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2015) 43 (1): 23–26. https://doi.org/10.1130/G36179.1 Article history Received: 13 Aug 2014 Revision Received: 07 Oct 2014 Accepted: 10 Oct 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation David J. Ullman, Anders E. Carlson, Allegra N. LeGrande, Faron S. Anslow, Angus K. Moore, Marc Caffee, Kent M. Syverson, Joseph M. Licciardi; Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation. Geology 2015;; 43 (1): 23–26. doi: https://doi.org/10.1130/G36179.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Establishing the precise timing for the onset of ice-sheet retreat at the end of the Last Glacial Maximum (LGM) is critical for delineating mechanisms that drive deglaciations. Uncertainties in the timing of ice-margin retreat and global ice-volume change allow a variety of plausible deglaciation triggers. Using boulder 10Be surface exposure ages, we date initial southern Laurentide ice-sheet (LIS) retreat from LGM moraines in Wisconsin (USA) to 23.0 ± 0.6 ka, coincident with retreat elsewhere along the southern LIS and synchronous with the initial rise in boreal summer insolation 24–23 ka. We show with climate-surface mass balance simulations that this small increase in boreal summer insolation alone is potentially sufficient to drive enhanced southern LIS surface ablation. We also date increased southern LIS retreat after ca. 20.5 ka likely driven by an acceleration in rising isolation. This near-instantaneous southern LIS response to boreal summer insolation before any rise in atmospheric CO2 supports the Milanković hypothesis of orbital forcing of deglaciations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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