scholarly journals Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
C. J. Fogwill ◽  
C. S. M. Turney ◽  
N. R. Golledge ◽  
D. M. Etheridge ◽  
M. Rubino ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Antarctic Ice Sheet ◽  
Last Glacial ◽  
The Last Glacial ◽  
Glacial Termination

Retreat of the East Antarctic ice sheet during the last glacial termination

2011 ◽  
Vol 4 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Andrew Mackintosh ◽  
Nicholas Golledge ◽  
Eugene Domack ◽  
Robert Dunbar ◽  
Amy Leventer ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Antarctic Ice Sheet ◽  
Last Glacial ◽  
The Last Glacial ◽  
Glacial Termination ◽  
East Antarctic Ice Sheet

Antarctic Ice Sheet changes since the Last Glacial Maximum

2022 ◽  
pp. 623-687
Author(s):  
Martin Siegert ◽  
Andrew S. Hein ◽  
Duanne A. White ◽  
Damian B. Gore ◽  
Laura De Santis ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
Ice Sheet ◽  
Glacial Maximum ◽  
Antarctic Ice Sheet ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

scholarly journals Modeling the Antarctic ice sheet

1997 ◽  
Vol 25 ◽  
pp. 259-268 ◽  
Author(s):  
Mikhail Verbitsky ◽  
Barry Saltzman
Keyword(s):  
Three Dimensional ◽  
Ice Sheet ◽  
Glacial Cycle ◽  
Antarctic Ice Sheet ◽  
Thermodynamic Equation ◽  
Last Glacial ◽  
Ice Stream ◽  
Basal Melting ◽  
The Antarctic ◽  
The Last Glacial

A three-dimensional (3-D), high-resolution, non-linearly viscous, non-isothermal ice-sheet model is employed to calculate the “present-day” equilibrium regime of the Antarctic ice sheet and its evolution during the last glacial cycle. The model is augmented by an approximate formula for ice-sheet basal temperature, based on a scaling of the thermodynamic equation for the ice flow. Steady-state solutions for both the shape and extent of the areas of basal melting (or freezing) are shown to be in good agreement with those obtained from the solution of the full 3-D thermodynamic equation. The solution for the basal temperature field of the West Antaretie Siple Coast produces areas at the pressure-melting point separated by strips of frozen-to-bed ice, the structure of which is reminiscent of Ice Streams A–E. This configuration appears to be robust, preserving its features in spite of climatic changes during the last glacial cycle. Ice Stream C seems to be more vulnerable to stagnation, switching to a passive mode at least once during the penultimate interglacial. We conjecture that the peculiarities of local topography determine the unique behavior of Ice Stream C: reduced basal stress and, consequently, relatively weak warming due to internal friction and basal sliding is not able to counteract the advective cooling during the periods of increased snowfall rate.

scholarly journals Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum

2014 ◽  
Vol 100 ◽  
pp. 10-30 ◽  
Author(s):  
Andrew N. Mackintosh ◽  
Elie Verleyen ◽  
Philip E. O'Brien ◽  
Duanne A. White ◽  
R. Selwyn Jones ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
Ice Sheet ◽  
Glacial Maximum ◽  
Antarctic Ice Sheet ◽  
Last Glacial ◽  
History Of ◽  
The Last Glacial Maximum ◽  
The Last Glacial ◽  
East Antarctic Ice Sheet

scholarly journals A comparison of different ways of dealing with isostasy: examples from modelling the Antarctic ice sheet during the last glacial cycle

1996 ◽  
Vol 23 ◽  
pp. 309-317 ◽  
Author(s):  
Emmanuel Le Meur ◽  
Philippe Huybrechts
Keyword(s):  
Three Dimensional ◽  
Ice Sheet ◽  
Earth Model ◽  
Glacial Cycle ◽  
Complex Deformation ◽  
Antarctic Ice Sheet ◽  
Last Glacial ◽  
The Antarctic ◽  
Strong Control ◽  
The Last Glacial

The bedrock isostatic response exerts a strong control on ice-sheet dynamics and is therefore always taken into account in ice-sheet models. This paper reviews the various methods normally used in the ice-sheet modelling community to deal with the bedrock response and compares these with a more sophisticated full-Earth model. Each of these bedrock treatments, five in total, is coupled with a three-dimensional thermomechanical ice-sheet model under the same forcing conditions to simulate the Antarctic ice sheet during the last glacial cycle. The outputs of the simulations are compared on the basis of the time-dependent behaviour for the total ice volume and the mean bedrock elevation during the cycle and of the present rate of uplift over Antarctica. This comparison confirms the necessity of accounting for the elastic bending of the lithosphere in order to yield realistic bedrock patterns. It furthermore demonstrates the deficiencies inherent to the diffusion equation in modelling the complex deformation within the mantle. Nevertheless, when characteristic parameters are varied within their range of uncertainty, differences within one single method are often of the same order as those between the various methods. This overview finally attempts to point out the main advantages and drawbacks of each of these methods and to determine which one is most appropriate depending on the specific modelling requirements.

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