Results 181 to 190 of about 8,171 (221)
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Laurentide Ice Sheet: Estimated volumes during Late Wisconsin
Reviews of Geophysics, 1972Estimates are made of the volumes of the Laurentide ice sheet and the Innuitian ice sheet (covering the Canadian Arctic Islands north of latitude 74°N) from 18,000 to 6000 B.P. Relevant parts of the existing theory of flow in an ice sheet are first reviewed.
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Laurentide Ice Sheet persistence during Pleistocene interglacials
Geology, 2023Abstract While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, using in situ cosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent during Quaternary interglacials ...
Danielle E. LeBlanc +5 more
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Laurentide ice-sheet instability during the last deglaciation
Nature Geoscience, 2015The factors leading to the full retreat of ice sheets during deglaciation are debated. Numerical modelling suggests that the Laurentide ice sheet retreated only after a threshold for warming and radiative forcing was passed in the Holocene.
David J. Ullman +4 more
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DEGLACIATION OF A SOFT-BEDDED LAURENTIDE ICE SHEET
Quaternary Science Reviews, 1998We present a series of numerical reconstructions of the Laurentide Ice Sheet during the last deglaciation (18–7 14C ka) that evaluates the sensitivity of ice-sheet geometry to subglacial sediment deformation. These reconstructions assume that the Laurentide Ice Sheet flowed over extensive areas of water-saturated, deforming sediment (soft beds ...
JOSEPH M. LICCIARDI +3 more
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Water sheet outburst floods from the Laurentide Ice Sheet
Canadian Journal of Earth Sciences, 1992Field evidence and a theoretical model support the concept that during Wisconsinan glaciation subglacial water sheet outburst floods issued from a large subglacial lake located in the Hudson Bay basin. The lake was fed by supraglacier meltwater that was trapped in a depressed ice lid over the lake. Water may have also fed the lake by reversed outburst
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Could the Laurentide Ice Sheet have exhibited internal oscillations?
2022<p>It is well known that the climate during the last glacial period was far from stable. The presence of layers of ice-rafted debris (IRD) in deep-sea sediments has been interpreted to reflect quasi-periodic episodes of massive iceberg calving from the Laurentide Ice Sheet (LIS).
Daniel Moreno +4 more
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Laurentide ice sheet: Oceanic and climatic implications
Palaeogeography, Palaeoclimatology, Palaeoecology, 1983Abstract An expanded and improved Wisconsinan stratigraphy of southeastern Canada, with revised correlations, has led to a new hypothesis on ice-mass shape and movement, since the last glacial maximum, which involves: (1) a refinement of the interpretations and correlations of continental climatostratigraphy; (2) the formulation of a model for the ...
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Low-gradient outlet glaciers (ice streams?) drained the Laurentide ice sheet
Geology, 2001Observations of geomorphic features dated with cosmogenic nuclides are used to determine the configuration of glaciation in Cumberland Sound, Baffin Island, during the last glacial maximum. Cumberland Sound, which was a major drainage of the Laurentide Ice Sheet at its northeastern (Arctic Canada) margin, contained low-gradient ice with a surface slope
M.R. Kaplan, G.H. Miller, E.J. Steig
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Keewatin Ice Sheet—Re-evaluation of the traditional concept of the Laurentide Ice Sheet
Geology, 1979Patterns of dispersal of distinctive Proterozoic and Paleozoic erratics across terrain formed on Archean and Aphebian crystalline rocks indicate that (1) ice never flowed from Hudson Bay into Keewatin in the region from the Manitoba border (lat 60°N) northward at least to lat 65°N; (2) westward-southwestward flow out of the bay, probably from a ...
W. W. Shilts +2 more
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Dynamics of Soil Carbon During Deglaciation of the Laurentide Ice Sheet
Science, 1992Deglaciation of the Laurentide Ice Sheet in North America was accompanied by sequestration of organic carbon in newly exposed soils. The greatest rate of land exposure occurred around 12,000 to 8,000 years ago, and the greatest increase in the rate of carbon sequestration by soils occurred from 8,000 to 4,000 years ago.
J W, Harden +3 more
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