Radiocarbon isochrones of the retreat of the Laurentide Ice Sheet
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Radiocarbon isochrones of the retreat of the Laurentide Ice Sheet by Reid A. Bryson

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Published by University of Wisconsin, Dept. of Meteorology in Madison .
Written in English

Subjects:

Places:

  • North America.

Subjects:

  • Glacial epoch -- North America.,
  • Radiocarbon dating.

Book details:

Edition Notes

Statementby Reid A. Bryson and Wayne M. Wendland.
SeriesUniversity of Wisconsin. Dept. of Meteorology. Technical report no. 35
ContributionsWendland, Wayne M., joint author.
Classifications
LC ClassificationsQC851 .W57 no. 35
The Physical Object
Pagination25, [3] p.
Number of Pages25
ID Numbers
Open LibraryOL5636903M
LC Control Number68064631

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  The largest of these ice sheets was the Laurentide Ice Sheet (Figure 1), covering much of Canada and the northern United States with a mass of ice that was nearly 4 km thick in some places. Af years ago, Earth started to warm, and the Laurentide Ice Sheet began to disappear. Radiocarbon isochrones on the disintegration of the Laurentide Ice The Laurentide Ice Sheet retained its identity as a distinct unit until about 8, years BP (Cockburn Stade) and had. Isochrones (n ¼ 36) showing the pattern of ice retreat of the North American Ice Sheet Complex (NAISC) along with estimates min/max uncertainties and a comparison of areal extent as compared to. The late Wisconsinan (25–10 ka bp [ka = thousands of radiocarbon years]) North American ice sheet complex consisted of three major ice sheets: the Laurentide Ice Sheet, which was centered on the Canadian Shield but also expanded across the Interior Plains to the west and south; the Cordilleran Ice Sheet, which inundated the western mountain belt between the northernmost coterminous United.

6krz fdswlrq 'hvfulswlrq 0xfk ri wkh zruog v srsxodwlrq lv orfdwhg dorqj wkh frdvwv,q d zruog ri fkdqjlqj folpdwh wkh udwh ri vhd ohyho ulvh zloo ghwhuplqh wkh delolw\ ri wkhvh frppxqlwlhv wr dgdsw wr vhd.   These isochrones also provide useful analogues of ice sheet behaviour that go beyond the observational record of modern ice sheets (e.g. Stokes et al., ) and are therefore critical for the calibration of numerical models to study past ice sheet change in response to climate (e.g. Tarasov et al., ; Batchelor et al., ). [1] To better understand mechanisms of ice‐sheet decay, we investigate the surface mass balance of the Laurentide Ice Sheet (LIS) during the early Holocene, a period of known rapid LIS retreat. We use a surface energy‐mass balance model (EMBM) driven with conditions derived from an equilibrium atmosphere‐ocean general circulation model 9 kilo‐years ago simulation. If, at the ice sheet maximum, bedrock below its center in Hudson Bay was in isostatic equilibrium, between and meters of uplift must have occurred between and B.P. Melting of ice in the Laurentide and Innuitian ice sheets betw and B.P. can account for a rise in sea level of between 56 and 76 meters.

Laurentide ice sheet (Lowell, ; Shane; and Ekberg et al., ). During the last glacial maximum, the ice sheet covered much of North America, advancing as far south as the vicinity of Cincinnati, Ohio. Much recent study has focused on paleoclimate reconstruction and the relationship between climate and ice sheet dynamics (Broecker and. Early Holocene Laurentide Ice Sheet Retreat To determine the LIS retreat rate, we compiled minimum limiting radiocarbon dates of deglaciation for Quebec, Labrador, eastern Nunavut20 and Hudson Bay21, along with cosmogenic 10Be ages from Labrador22 and Quebec14 (Fig. 1c, 2a & S1). All. The Laurentide Ice Sheet was a massive sheet of ice that covered millions of square kilometers, including most of Canada and a large portion of the Northern United States, multiple times during the Quaternary glacial epochs, from ± million years ago to the present.. The last advance covered most of northern North America between c. 95, and c. 20, years before the present . The information presented for the timing of the advance towards the maximum ice cover and the subsequent pattern of retreat provides further valuable material to test the dynamic ice sheet and climate models including the reactions to the Earth's orbital radiation changes.