scholarly journals Sea-level records from the U.S. mid-Atlantic constrain Laurentide Ice Sheet extent during Marine Isotope Stage 3

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
T Pico ◽  
J. R. Creveling ◽  
J. X. Mitrovica
Keyword(s):  
Sea Level ◽  
Ice Sheet ◽  
Marine Isotope Stage ◽  
Laurentide Ice Sheet ◽  
Marine Isotope Stage 3 ◽  
The U.S

scholarly journals Was the Laurentide Ice Sheet significantly reduced during Marine Isotope Stage 3?

Geology ◽  
2019 ◽  
Vol 47 (2) ◽  
pp. 111-114 ◽  
Author(s):  
April S. Dalton ◽  
Sarah A. Finkelstein ◽  
Steven L. Forman ◽  
Peter J. Barnett ◽  
Tamara Pico ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Marine Isotope Stage ◽  
Laurentide Ice Sheet ◽  
Marine Isotope Stage 3

Refining the Laurentide Ice Sheet at Marine Isotope Stage 3: A data-based approach combining glacial isostatic simulations with a dynamic ice model

2018 ◽  
Vol 195 ◽  
pp. 171-179 ◽  
Author(s):  
T. Pico ◽  
L. Birch ◽  
J. Weisenberg ◽  
J.X. Mitrovica
Keyword(s):  
Ice Sheet ◽  
Marine Isotope Stage ◽  
Laurentide Ice Sheet ◽  
Marine Isotope Stage 3 ◽  
Ice Model

scholarly journals Pollen and macrofossil-inferred palaeoclimate at the Ridge Site, Hudson Bay Lowlands, Canada: evidence for a dry climate and significant recession of the Laurentide Ice Sheet during Marine Isotope Stage 3

Boreas ◽  
2016 ◽  
Vol 46 (3) ◽  
pp. 388-401 ◽  
Author(s):  
April S. Dalton ◽  
Minna Väliranta ◽  
Peter J. Barnett ◽  
Sarah A. Finkelstein
Keyword(s):  
Ice Sheet ◽  
Marine Isotope Stage ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Hudson Bay Lowlands ◽  
Marine Isotope Stage 3

scholarly journals Was there a glacial outburst flood in the Torngat Mountains during Marine Isotope Stage 3?

2021 ◽  
Author(s):  
Tamara Pico ◽  
Jane Willenbring ◽  
April S. Dalton ◽  
Sidney Hemming
Keyword(s):  
Ice Sheet ◽  
High Elevation ◽  
Marine Isotope Stage ◽  
Laurentide Ice Sheet ◽  
Freshwater Flux ◽  
Outburst Flood ◽  
Mis 3 ◽  
Flood Volume ◽  
Marine Isotope Stage 3 ◽  
Exposure Ages

Abstract. We report previously unpublished evidence for a Marine Isotope Stage 3 (MIS 3; 60–26 ka) glacial outburst flood in the Torngat Mountains (northern Quebec/Labrador, Canada). We present 10Be cosmogenic exposure ages from legacy fieldwork for a glacial lake shoreline with evidence for outburst flooding in the Torngat Mountains, with a minimum age of 36 ± 3 ka (we consider the most likely age, corrected for burial, to be ~56 ± 3 ka). This shoreline position and age can potentially constrain the Laurentide Ice Sheet margin in the Torngat Mountains. This region, considered a site of glacial inception, has no published dated geologic constraints for high-elevation MIS 3 ice margins. We estimate the freshwater flux associated with the inferred glacial outburst flood using high-resolution digital elevation maps corrected for glacial isostatic adjustment. Using assumptions about the ice-dammed locations we find that a freshwater flood volume of 1.14 × 1012 m3 could have entered the Hudson Strait. This glacial outburst flood volume could have contributed to surface ocean freshening to cause a measurable meltwater signal in δ18O records, but would not necessarily have been associated with substantial ice rafted debris. Future work is required to refine estimates of the size and timing of such a glacial outburst flood. Nevertheless, we outline testable hypotheses about the Laurentide Ice Sheet and glacial outburst floods, including possible implications for Heinrich events and glacial inception in North America, that can be assessed with additional fieldwork and cosmogenic measurements.

Observations of postglacial uplift at Churchill, Manitoba

1992 ◽  
Vol 29 (11) ◽  
pp. 2418-2425 ◽  
Author(s):  
A. Mark Tushingham
Keyword(s):  
Sea Level ◽  
Tide Gauge ◽  
Ice Sheet ◽  
Laurentide Ice Sheet ◽  
Glacial Isostatic Adjustment ◽  
Tide Gauge Record ◽  
Isostatic Adjustment ◽  
Absolute Gravimetry ◽  
The Earth ◽  
Level Data

Churchill, Manitoba, is located near the centre of postglacial uplift caused by the Earth's recovery from the melting of the Laurentide Ice Sheet. The value of present-day uplift at Churchill has important implications in the study of postglacial uplift in that it can aid in constraining the thickness of the ice sheet and the rheology of the Earth. The tide-gauge record at Churchill since 1940 is examined, along with nearby Holocene relative sea-level data, geodetic measurements, and recent absolute gravimetry measurements, and a present-day rate of uplift of 8–9 mm/a is estimated. Glacial isostatic adjustment models yield similar estimates for the rate of uplift at Churchill. The effects of the tide-gauge record of the diversion of the Churchill River during the mid-1970's are discussed.

Mechanisms for an ∼7-kyr climate and sea-level oscillation during marine isotope stage 3

2007 ◽  
pp. 209-246 ◽  
Author(s):  
Peter U. Clark ◽  
Steven W. Hostetler ◽  
Nicklas G. Pisias ◽  
Andreas Schmittner ◽  
Katrin J. Meissner
Keyword(s):  
Sea Level ◽  
Marine Isotope Stage ◽  
Level Oscillation ◽  
Marine Isotope Stage 3 ◽  
And Sea Level

scholarly journals Submarine melt as a potential trigger of the North East Greenland Ice Stream margin retreat during Marine Isotope Stage 3

2019 ◽  
Vol 13 (7) ◽  
pp. 1911-1923 ◽  
Author(s):  
Ilaria Tabone ◽  
Alexander Robinson ◽  
Jorge Alvarez-Solas ◽  
Marisa Montoya
Keyword(s):  
Three Dimensional ◽  
Ice Sheet ◽  
High Sensitivity ◽  
Marine Isotope Stage ◽  
Atmospheric Conditions ◽  
North East ◽  
Ice Stream ◽  
Grounding Line ◽  
Oceanic Forcing ◽  
Marine Isotope Stage 3

Abstract. The Northeast Greenland Ice Stream (NEGIS) has been suffering a significant ice mass loss during the last decades. This is partly due to increasing oceanic temperatures in the subpolar North Atlantic, which enhance submarine basal melting and mass discharge. This demonstrates the high sensitivity of this region to oceanic changes. In addition, a recent study suggested that the NEGIS grounding line was 20–40 km behind its present-day location for 15 ka during Marine Isotope Stage (MIS) 3. This is in contrast with Greenland temperature records indicating cold atmospheric conditions at that time, expected to favour ice-sheet expansion. To explain this anomalous retreat a combination of atmospheric and external forcings has been invoked. Yet, as the ocean is found to be a primary driver of the ongoing retreat of the NEGIS glaciers, the effect of past oceanic changes in their paleo evolution cannot be ruled out and should be explored in detail. Here we investigate the sensitivity of the NEGIS to the oceanic forcing during the last glacial period using a three-dimensional hybrid ice-sheet–shelf model. We find that a sufficiently high oceanic forcing could account for a NEGIS ice-margin retreat of several tens of kilometres, potentially explaining the recently proposed NEGIS grounding-line retreat during Marine Isotope Stage 3.

A relative sea-level history for Arviat, Nunavut, and implications for Laurentide Ice Sheet thickness west of Hudson Bay

2014 ◽  
Vol 82 (1) ◽  
pp. 185-197 ◽  
Author(s):  
Karen M. Simon ◽  
Thomas S. James ◽  
Donald L. Forbes ◽  
Alice M. Telka ◽  
Arthur S. Dyke ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Ice Sheet ◽  
Tidal Range ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Level Curve ◽  
Relative Sea Level ◽  
Vertical Land Motion ◽  
Crustal Uplift

AbstractThirty-six new and previously published radiocarbon dates constrain the relative sea-level history of Arviat on the west coast of Hudson Bay. As a result of glacial isostatic adjustment (GIA) following deglaciation, sea level fell rapidly from a high-stand of nearly 170 m elevation just after 8000 cal yr BP to 60 m elevation by the mid Holocene (~ 5200 cal yr BP). The rate of sea-level fall decreased in the mid and late Holocene, with sea level falling 30 m since 3000 cal yr BP. Several late Holocene sea-level measurements are interpreted to originate from the upper end of the tidal range and place tight constraints on sea level. A preliminary measurement of present-day vertical land motion obtained by repeat Global Positioning System (GPS) occupations indicates ongoing crustal uplift at Arviat of 9.3 ± 1.5 mm/yr, in close agreement with the crustal uplift rate inferred from the inferred sea-level curve. Predictions of numerical GIA models indicate that the new sea-level curve is best fit by a Laurentide Ice Sheet reconstruction with a last glacial maximum peak thickness of ~ 3.4 km. This is a 30–35% thickness reduction of the ICE-5G ice-sheet history west of Hudson Bay.

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