Physics – Geophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3681h&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 19, p. 3681-3684
Physics
Geophysics
3
Hydrology: Glaciology, Mathematical Geophysics: Modeling, Mathematical Geophysics: Nonlinear Dynamics
Scientific paper
Ice-sheet flows can be channelled by perturbations in the basal topography or in the sliding coefficient. These lead to spatial variation in the steady profile, the flux and the dissipative heating. This paper examines the linearized theory of heating variations, showing that the map plane aspect ratio of the basal perturbation has a dominating effect on the qualitative behavior. For ribbing transverse to the direction of flow, maximum heating occurs over bedrock and sliding viscosity highs. When flow-parallel channeling occurs maximum heating occurs over bedrock lows and sliding viscosity lows. These results are used to examine symmetry-breaking behavior of numerical thermoviscous ice-sheet models in terms of a dissipation-driven creep instability.
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