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| Titel |
Laurentide Ice Sheet basal temperatures at the Last Glacial Cycle as inferred from borehole data |
| VerfasserIn |
Jean-Claude Mareschal, Carolyne Pickler, Hugo Beltrami |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250128900
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| Publikation (Nr.) |
 EGU/EGU2016-8940.pdf |
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| Zusammenfassung |
| We measured and inverted thirteen temperature-depth profiles (≥1500 m) in boreholes in
eastern and central Canada to determine the ground surface temperature histories during and
after the last glacial cycle. The sites are located in the southern part of the region covered by
the Laurentide Ice Sheet. The inversions yield ground surface temperatures ranging from -1.4
to 3.0oC throughout the last glacial cycle. These temperatures, near the pressure melting point
of ice, demonstrate that the southern portion of the Laurentide Ice Sheet was not
frozen to the bed, allowing for basal flow and fast flowing ice streams at the base.
Despite such conditions, which have been inferred from geomorphological data and
models, the ice sheet persisted throughout the last glacial cycle. Our results suggest
some regional trends in basal temperatures with possible control by internal heat
flow. |
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