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The Stability of Grounding Lines on Retrograde Slopes : Volume 6, Issue 6 (12/12/2012)

By Gudmundsson, G. H.

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Book Id: WPLBN0004022569
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: The Stability of Grounding Lines on Retrograde Slopes : Volume 6, Issue 6 (12/12/2012)  
Author: Gudmundsson, G. H.
Volume: Vol. 6, Issue 6
Language: English
Subject: Science, Cryosphere
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany

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Gagliardini, O., Durand, G., Favier, L., Gudmundsson, G. H., & Krug, J. (2012). The Stability of Grounding Lines on Retrograde Slopes : Volume 6, Issue 6 (12/12/2012). Retrieved from http://worldlibrary.in/


Description
Description: British Antarctic Survey, High Cross, Madingley Rd., Cambridge, CB3 0ET, UK. The stability of marine ice sheets grounded on beds that slope upwards in the overall direction of flow is investigated numerically in two horizontal dimensions. We give examples of stable grounding lines on such retrograde slopes illustrating that marine ice sheets are not unconditionally unstable in two horizontal dimensions. Retrograde bed slopes at the grounding lines of marine ice sheets, such as the West Antarctic Ice Sheet (WAIS), do not per se imply an instability, nor do they imply that these regions are close to a threshold of instability. We therefore question those estimates of the potential near-future contribution of WAIS to global sea level change based solely on the notion that WAIS, resting on a retrograde slope, must be inherently unstable.

Summary
The stability of grounding lines on retrograde slopes

Excerpt
Bamber, J. L., Riva, R. E. M., Vermeersen, B. L. A., and LeBrocq, A. M.: Reassessment of the potential sea-level rise from a collapse of the West Antarctic ice sheet, Science, 324, 901–903, doi:10.1126/science.1169335, available at: http://www.sciencemag.org/content/324/5929/901.abstract, 2009.; Baral, D. R. and Hutter, C.: Asymptotic theories of ice sheets and ice shelves, in: Geomorphological Fluid Mechanics, edited by: Balmforth, N. J. and Provenzale, A., Lecture Notes in Physics, chap. 11, Springer, 227–278, 2001.; Dupont, T. K. and Alley, R. B.: Assessment of the importance of ice-shelf buttressing to ice-sheet flow, Geophys. Res. Lett., 32, L04503, doi:10.1029/2004GL022024, 2005.; Durand, G., Gagliardini, O., de Fleurian, D., Zwinger, T., and Meur, E. L.: Marine ice sheet dynamics: h}ysteresis and neutral equilibrium, J. Geophys. Res., 114, F03009, doi:10.1029/2008JF001170, 2009{a.; Morland, L. W.: Thermomechanical balances of ice-sheet flows, Geophys. Astro. Fluid, 29, 237–266, 1984.; Durand, G., Gagliardini, O., Zwinger, T., Meur, E. L., and Hindmarsh, R.: Full-Stokes modeling of marine ice-sheets: influence of the grid size, Ann. Glaciol., 50, 109–114, 2009{b}.; Favier, L., Gagliardini, O., Durand, G., and Zwinger, T.: A three-dimensional full Stokes model of the grounding line dynamics: effect of a pinning point beneath the ice shelf, The Cryosphere, 6, 101–112, doi:10.5194/tc-6-101-2012, 2012.; Gagliardini, O., Durand, G., Zwinger, T., Hindmarsh, R. C. A., and Meur, E. L.: Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics, Geophys. Res. Lett., 37, L14501, doi:10.1029/2010GL043334, 2010.; Gladstone, R. M., Payne, A. J., and Cornford, S, L.: Resolution requirements for grounding-line modelling: sensitivity to basal drage and ice-shelf buttressing. Ann. Glaciol., 53, 97–105, doi:10.3189/2012AoG60A148, 2012.; Goldberg, D., Holland, D. M., and Schoof, C.: Grounding line movement and ice shelf buttressing in marine ice sheets, J. Geophys. Res., 114, F04026, doi:10.1029/2008JF001227, 2009.; Gudmundsson, G. H.: Analytical solutions for the surface response to small amplitude perturbations in boundary data in the shallow-ice-stream approximation, The Cryosphere, 2, 77–93, doi:10.5194/tc-2-77-2008, 2008.; Hindmarsh, R. C. A.: Qualitative dynamics of marine ice sheets, in: Ice in the Climate System, edited by: Peltier, W. R., no. 12 in NATO ASI Series I, Springer, 66–99, 1993.; Hindmarsh, R. C. A.: Stability of ice rises and uncoupled marine ice sheets, Ann. Glaciol., 23, 94–104, 1996.; Hutter, K.: Theoretical Glaciology; Material Science of Ice and the Mechanics of Glaciers and Ice Sheets, D. Reidel Publishing Company/Tokyo, Terra Scientific Publishing Company, 1983.; Jamieso

 

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