Tidally Controlled Stick-Slip Discharge of a West Antarctic Ice-Reference-Cited by-同舟云学术

Tidally Controlled Stick-Slip Discharge of a West Antarctic Ice

Published:2003-08-22 Issue:5636 Volume:301 Page:1087-1089
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Bindschadler Robert A.¹²³⁴,King Matt A.¹²³⁴,Alley Richard B.¹²³⁴,Anandakrishnan Sridhar¹²³⁴,Padman Laurence¹²³⁴

Affiliation:

1. Ocean and Ice Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.

2. School of Civil Engineering and Geosciences, University of Newcastle, Newcastle Upon Tyne, NE1 7RU, UK.

3. Department of Geosciences and EMS Environment Institute, Pennsylvania State University, University Park, PA 16802, USA.

4. Earth and Space Research, Seattle, WA 98102–3620, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference38 articles.

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