TY - JOUR
T1 - Multiple steady states in ice-water-till systems
AU - Alley, R. B.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1990
Y1 - 1990
N2 - An ice sheet with fixed boundary conditions may have two steady configurations, as shown by a new one-dimensional model including the physics and continuity of ice, water, and deforming subglacial till. In one steady state, a steep surface slope causes rapid internal ice shearing but forces basal water through subglacial aquifers, suppressing basal velocity; in the other steady state, a gentle surface slope causes only slow ice shearing but allows water to lubricate the ice-bed interface and cause large ice-sheet response during a switch between steady states. -Author
AB - An ice sheet with fixed boundary conditions may have two steady configurations, as shown by a new one-dimensional model including the physics and continuity of ice, water, and deforming subglacial till. In one steady state, a steep surface slope causes rapid internal ice shearing but forces basal water through subglacial aquifers, suppressing basal velocity; in the other steady state, a gentle surface slope causes only slow ice shearing but allows water to lubricate the ice-bed interface and cause large ice-sheet response during a switch between steady states. -Author
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U2 - 10.3189/s0260305500008132
DO - 10.3189/s0260305500008132
M3 - Article
AN - SCOPUS:0025657126
SN - 0260-3055
VL - 14
SP - 1
EP - 5
JO - Annals of Glaciology
JF - Annals of Glaciology
ER -