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Cordilleran Ice Sheet mass loss preceded climate reversals near the Pleistocene Termination

Menounos, B., Goehring, B. M., Osborn, G., Margold, M., Ward, B., Bond, J., Clarke, G. K. C., Clague, J. J., Lakeman, T., Koch, J., Caffee, M. W., Gosse, J., Stroeven, A. P., Seguinot, J., Heyman, J.·2017·Science
DOI 10.1126/science.aan3001
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Abstract

Disappearance of an ice sheet: The Cordilleran Ice Sheet is thought to have covered westernmost Canada until about 13,000 years ago, even though the warming and sea level rise of the last deglaciation had begun more than a thousand years earlier. This out-of-phase behavior has puzzled glaciologists because it is not clear what mechanisms could account for it. Menounos et al. report measurements of the ages of cirque and valley glaciers that show that much of western Canada was ice-free as early as 14,000 years ago—a finding that better agrees with the record of global ice volume (see the Perspective by Marcott and Shakun). Previous reconstructions seem not to have adequately reflected the complexity of ice sheet decay. Science , this issue p. 781 ; see also p. 721

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  • This finding is consistent with a trend of ice sheet thinning by around 14.0 ka, during which the Cordilleran Ice Sheet contributed 2.5-3.0 m to eustatic sea-level rise.

    “This finding is consistent with a trend of ice sheet thinning by around 14.0 ka, during which the Cordilleran Ice Sheet contributed 2.5-3.0 m to eustatic sea-level rise (Lambeck et al., 2014;Margold et al., 2014;Menounos et al., 2017), potentially contributing to meltwater pulses at this time (Gomez et al., 2015;Gregoire et al., 2016Gregoire et al., , 2012;;Ivanovic et al., 2017).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Menounos et al., 2017

  • The pattern of ice retreat was complex, and ice remained proximal until ca. 15.0 ka, but ice-free or partially ice-free islands along the coast may have facilitated southward human migration.

    “The pattern of ice retreat was complex, and ice remained proximal until ca.15.0 ka (Davies et al., 2011;Lesnek et al., 2018;Menounos et al., 2017), but ice-free or partially ice-free islands along the coast may have facilitated southward human migration (Erlandson et al., 2011;Mandryk et al., 2001).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Menounos et al., 2017

  • Interquartile ranges provide a conservative estimate of age uncertainty in light of possible postdepositional snow cover, erosion, or exhumation.

    “Interquartile ranges provide a conservative estimate of age uncertainty in light of possible postdepositional snow cover, erosion, or exhumation (Menounos et al., 2017).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Menounos et al., 2017

  • The Cordilleran Ice Sheet contributed 2.5-3.0 m to eustatic sea-level rise during ice sheet thinning by around 14.0 ka.

    “This finding is consistent with a trend of ice sheet thinning by around 14.0 ka, during which the Cordilleran Ice Sheet contributed 2.5-3.0 m to eustatic sea-level rise (Lambeck et al., 2014;Margold et al., 2014;Menounos et al., 2017), potentially contributing to meltwater pulses at this time (Gomez et al., 2015;Gregoire et al., 2016Gregoire et al., , 2012;;Ivanovic et al., 2017).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Menounos et al., 2017

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Metadata

Authors
Menounos, B., Goehring, B. M., Osborn, G., Margold, M., Ward, B., Bond, J., Clarke, G. K. C., Clague, J. J., Lakeman, T., Koch, J., Caffee, M. W., Gosse, J., Stroeven, A. P., Seguinot, J., & Heyman, J.
Affiliations
  • Natural Resources and Environmental Studies Institute and Geography, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada.
  • Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70118, USA.
  • Department of Geoscience, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
  • Geomorphology and Glaciology, Department of Physical Geography, Stockholm University, S-10691 Stockholm, Sweden.
  • Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
  • Yukon Geological Survey, Whitehorse, Yukon Y1A 2B5, Canada.
  • Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
  • Geological Survey of Norway, Trondheim 7040, Norway.
  • Department of Geography, Kwantlen Polytechnic University, Surrey, British Columbia V3W 2M8, Canada.
  • Department of Physics and Astronomy and Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA.
  • Department of Earth Sciences, Dalhousie University, Halifax Nova Scotia B3H 4R2, Canada.
ORCID
Venue
Science
Publisher
American Association for the Advancement of Science (AAAS)
Published
2017-11-10
Volume
358
Issue
6364
Pages
781-784
ISSN
  • 0036-8075
  • 1095-9203
DOI
10.1126/science.aan3001
Cited by
74
References
0
Language
en
Funders
  • Natural Sciences and Engineering Research Council of Canada (award309823)
  • Canada Research Chairs (award309829)

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