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Tidally controlled stick-slip discharge of a West Antarctic ice stream
journal contributionposted on 2023-05-17, 15:13 authored by Bindschadler, RA, Matt KingMatt King, Alley, RB, Anandakrishnan, S, Padman, L
A major West Antarctic ice stream discharges by sudden and brief periods of very rapid motion paced by oceanic tidal oscillations of about 1 meter. Acceleration to speeds greater than 1 meter per hour and deceleration back to a stationary state occur in minutes or less. Slip propagates at approximately 88 meters per second, suggestive of a shear wave traveling within the subglacial till. A model of an episodically slipping friction-locked fault reproduces the observed quasi-periodic event timing, demonstrating an ice stream's ability to change speed rapidly and its extreme sensitivity to subglacial conditions and variations in sea level.
Department/SchoolSchool of Geography, Planning and Spatial Sciences