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Record #103792:

Multiple steady states in ice-water-till systems / Richard B. Alley.

Title: Multiple steady states in ice-water-till systems / Richard B. Alley.
Author(s): Alley, Richard B.
Date: 1990.
In: Annals of Glaciology. (1990.), Vol. 14 (1990)
Abstract: Ice sheet with fixed boundary conditions may have two steady configurations, as shown by new one-dimensional model including physics and continuity of ice, water, and deformable subglacial till. In one steady state, steep surface slope causes rapid internal ice shearing, but forces basal water through subglacial aquifers, suppressing basal velocity; in the other steady state, gentle surface slope causes only slow ice shearing but allows water to lubricate ice/bed interface and cause rapid basal velocities. Small climatic forcing may cause large ice-sheet response during switch between steady states.
Notes:

Annals of Glaciology. Vol. 14 :1-5 (1990).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.51 -- Land ice, theory of flow.
551.588.5 -- Climate, relationship with ice.
551.588 -- Climate, effect of man and environment.
551.583 -- Climatic changes.
E5 -- Glaciology: land ice.
SPRI record no.: 103792

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520 3# ‡aIce sheet with fixed boundary conditions may have two steady configurations, as shown by new one-dimensional model including physics and continuity of ice, water, and deformable subglacial till. In one steady state, steep surface slope causes rapid internal ice shearing, but forces basal water through subglacial aquifers, suppressing basal velocity; in the other steady state, gentle surface slope causes only slow ice shearing but allows water to lubricate ice/bed interface and cause rapid basal velocities. Small climatic forcing may cause large ice-sheet response during switch between steady states.
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