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Numerical simulations of the Cordilleran ice sheet through the last glacial cycle

Seguinot, Julien, Rogozhina, Irina, Stroeven, Arjen P., Margold, Martin, Kleman, Johan·2016·The Cryosphere
DOI 10.5194/tc-10-639-2016

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Abstract

After more than a century of geological research, the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on which the ice sheet formed, geological studies have often had only local or regional relevance and shown such a complexity that ice-sheet-wide spatial reconstructions of advance and retreat patterns are lacking. Here we use a numerical ice sheet model calibrated against field-based evidence to attempt a quantitative reconstruction of the Cordilleran ice sheet history through the last glacial cycle. A series of simulations is driven by time-dependent temperature offsets from six proxy records located around the globe. Although this approach reveals large variations in model response to evolving climate forcing, all simulations produce two major glaciations during marine oxygen isotope stages 4 (62.2–56.9 ka) and 2 (23.2–16.9 ka). The timing of glaciation is better reproduced using temperature reconstructions from Greenland and Antarctic ice cores than from regional oceanic sediment cores. During most of the last glacial cycle, the modelled ice cover is discontinuous and restricted to high mountain areas. However, widespread precipitation over the Skeena Mountains favours the persistence of a central ice dome throughout the glacial cycle. It acts as a nucleation centre before the Last Glacial Maximum and hosts the last remains of Cordilleran ice until the middle Holocene (6.7 ka).

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  • Numerical ice sheet modeling simulates the western margin of the Cordilleran Ice Sheet at the continental shelf at 16 ka.

    “Numerical ice sheet modeling simulates the western margin of the Cordilleran Ice Sheet at the continental shelf at 16 ka (Seguinot et al., 2014(Seguinot et al., , 2016)), broadly consistent with previous conceptual models for the region (Fulton, 1991;Mann & Peteet, 1994;Margold et al., 2014;Ryder et al., 1991).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Seguinot et al., 2016

  • The retreat of the western margin by 18.1 ka was earlier than simulated by ice sheet models.

    “Our 10 Be dating chronology reveals that the western margin of the Cordilleran Ice Sheet along the central coast of British Columbia retreated to the present-day coastline by at least 18.1 ± 0.2 ka; earlier than simulated by ice sheet models (Seguinot et al., 2016).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Seguinot et al., 2016

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Metadata

Authors
Seguinot, J., Rogozhina, I., Stroeven, A. P., Margold, M., & Kleman, J.
ORCID
Venue
The Cryosphere
Publisher
Copernicus GmbH
Published
2016-03-16
Volume
10
Issue
2
Pages
639-664
ISSN
1994-0424
DOI
10.5194/tc-10-639-2016
Cited by
61
References
0
Language
en
Licence
creativecommons.org/licenses/by/3.0/ (vor)

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