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TC | Volume 12, issue 3
The Cryosphere, 12, 1047–1067, 2018
https://doi.org/10.5194/tc-12-1047-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
The Cryosphere, 12, 1047–1067, 2018
https://doi.org/10.5194/tc-12-1047-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Mar 2018

Research article | 23 Mar 2018

Implementing an empirical scalar constitutive relation for ice with flow-induced polycrystalline anisotropy in large-scale ice sheet models

Felicity S. Graham et al.
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Cited articles  
Azuma, N. and Goto-Azuma, K.: An anisotropic flow law for ice sheet ice and its implications, Ann. Glaciol., 23, 202–208, 1996. a, b
Baker, R.: Is the creep of ice really independent of the third deviatoric stress invariant?, in: The Physical Basis of Ice Sheet Modelling, 7–16, IAHS Publ. 170, 1987. a
Blatter, H.: Velocity And Stress-Fields In Grounded Glaciers: A Simple Algorithm For Including Deviatoric Stress Gradients, J. Glaciol., 41, 333–344, 1995. a
Bouchez, J. and Duval, P.: The fabric of polycrystalline ice deformed in simple shear: Experiments in torsion, natural deformation and geometrical interpretation, Texture Microstruct, 5, 171–190, 1982. a
Breuer, B., Lange, M. A., and Blindow, N.: Sensitivity studies on model modifications to assess the dynamics of a temperature ice cap, such as that on King George Island, Antarctica, J. Glaciol., 52, 235–247, 2006. a
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Ice sheet flow is anisotropic, depending on the nature of the stress applied. However, most large-scale ice sheet models rely on the Glen flow relation, which ignores anisotropic effects. We implement a flow relation (ESTAR) for anisotropic ice in a large-scale ice sheet model. In ice shelf simulations, the Glen flow relation overestimates velocities by up to 17 % compared with ESTAR. Our results have implications for ice sheet model simulations of paleo-ice extent and sea level rise prediction.
Ice sheet flow is anisotropic, depending on the nature of the stress applied. However, most...
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