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Near-constant retreat rate of a terrestrial margin of the Laurentide Ice Sheet during the last deglaciation
Abstract
The Laurentide Ice Sheet (LIS) was the largest ice sheet during the last glacial period. An accurate representation of its behavior during the last deglaciation is critical to understanding its influence on and response to a changing climate. We use 10Be dating and Bayesian modeling to track the recession of the southwest sector of the Labrador Dome of the LIS along an ∼500-km-long transect west of Lake Superior during the last deglaciation. This transect reflects terrestrial ice-margin retreat and crosses multiple moraine sets, with the southwestern part of the transect deglaciated by ca. 19 ka and the northeastern part deglaciated by ca. 10 ka. The predominant behavior of the ice margin during this interval is near-constant retreat with retreat rates varying between ∼59 m/a and 38 m/a. The moraine sets mark standstills and/or readvances that in total constitute only ∼17% of the retreat interval. The spatial and temporal pattern of ice-margin retreat tracked here differs from existing reconstructions that are based on using isochrons to define ice-margin positions. Acknowledging the uncertainties associated with the modeled ages of ice-margin retreat, we suggest that the overall retreat pattern is consistent with forcing by a gradual increase in Northern Hemisphere, high-latitude summer insolation. The pattern of ice-margin retreat is inconsistent with Greenland ice-core temperature records, and thus these records may not be suitable to drive models of the LIS.
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“14C ages typically provide only minimum-limiting ages on ice-margin retreat, owing to the unknown amount of time that lapsed between deglaciation and accumulation of reliably datable organic material (e.g., terrestrial plants) (35, 36).”
From The age of the opening of the Ice-Free Corridor and implications for the peopling of the Americas (2022) · cites this paper as [36]
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Cited by
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The age of the opening of the Ice-Free Corridor and implications for the peopling of the Americas
Clark, J., Carlson, A. E., Reyes, A. V., Carlson, E. C. B., Guillaume, L., Milne, G. A., Tarasov, L., Caffee, M., Wilcken, K., & Rood, D. H. (2022) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2118558119 · Cited by 53
Metadata
- Authors
- Lowell, T. V., Kelly, M. A., Howley, J. A., Fisher, T. G., Barnett, P. J., Schwart, R., Zimmerman, S. R. H., Norris, N., & Malone, A. G. O.
- Affiliations
- Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221, USA
- Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA
- Department of Environmental Sciences, University of Toledo, Toledo, Ohio 43606, USA
- Harquail School of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, Illinois 60607, USA
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2021-08-30
- Volume
- 49
- Issue
- 12
- Pages
- 1511-1515
- ISSN
- 0091-7613
- 1943-2682
- Cited by
- 22
- References
- 1
- Language
- en
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