scholarly journals Frictional origin of slip events of the Whillans Ice Stream, Antarctica

2021 ◽  
Author(s):  
Gauthier Guerin ◽  
Aurélien Mordret ◽  
Diane Rivet ◽  
Bradley P. Lipovsky ◽  
Brent M. Minchew
Keyword(s):  
Ice Stream ◽  
Whillans Ice Stream

Dynamics of stick–slip motion, Whillans Ice Stream, Antarctica

2011 ◽  
Vol 305 (3-4) ◽  
pp. 283-289 ◽  
Author(s):  
J. Paul Winberry ◽  
Sridhar Anandakrishnan ◽  
Douglas A. Wiens ◽  
Richard B. Alley ◽  
Knut Christianson
Keyword(s):  
Stick Slip ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Stick Slip Motion ◽  
Slip Motion

scholarly journals Basal mechanics of ice streams: Insights from the stick-slip motion of Whillans Ice Stream, West Antarctica

2009 ◽  
Vol 114 (F1) ◽  
Author(s):  
J. Paul Winberry ◽  
Sridhar Anandakrishnan ◽  
Richard B. Alley ◽  
Robert A. Bindschadler ◽  
Matt A. King
Keyword(s):  
West Antarctica ◽  
Ice Streams ◽  
Stick Slip ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Stick Slip Motion ◽  
Slip Motion

scholarly journals Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements

2003 ◽  
Vol 49 (165) ◽  
pp. 223-230 ◽  
Author(s):  
Vandy Blue Spikes ◽  
Beáta M. Csatho ◽  
Gordon S. Hamilton ◽  
Ian M. Whillans
Keyword(s):  
Average Rate ◽  
West Antarctica ◽  
Laser Altimeter ◽  
Equivalent Thickness ◽  
Thickness Change ◽  
Airborne Laser ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Elevation Changes ◽  
Global Sea Level

AbstractRepeat airborne laser altimeter measurements are used to derive surface elevation changes on parts of Whillans Ice Stream and Ice Stream C, West Antarctica. Elevation changes are converted to estimates of ice equivalent thickness change using local accumulation rates, surface snow densities and vertical bedrock motions. The surveyed portions of two major tributaries of Whillans Ice Stream are found to be thinning almost uniformly at an average rate of ∼1 m a−1. Ice Stream C has a complicated elevation-change pattern, but is generally thickening. These results are used to estimate the contribution of each surveyed region to the current rate of global sea-level rise.

scholarly journals Melting and freezing beneath the Ross ice streams, Antarctica

2004 ◽  
Vol 50 (168) ◽  
pp. 96-108 ◽  
Author(s):  
Ian Joughin ◽  
Slawek Tulaczyk ◽  
Douglas R. MacAyeal ◽  
Hermann Engelhardt
Keyword(s):  
Steady Flow ◽  
Temperature Model ◽  
West Antarctica ◽  
Ice Streams ◽  
Horizontal Advection ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Shear Heating ◽  
Strain Heating ◽  
Inland Ice

AbstractWe have estimated temperature gradients and melt rates at the bottom of the ice streams in West Antarctica. Measured velocities were used to include the effects of horizontal advection and strain heating in the temperature model and to determine shear heating at the bed. Our modeled temperatures agree well with measured temperatures from boreholes in regions of steady flow. We find that ice-stream tributaries and the inland ice account for about 87% of the total melt generated beneath the Ross ice streams and their catchments. Our estimates indicate that the ice plains of Whillans Ice Stream and Ice Stream C (even when active) have large areas subject to basal freezing, confirming earlier estimates that import of water from upstream is necessary to sustain motion. The relatively low melt rates on Whillans Ice Stream are consistent with observations of deceleration over the last few decades and suggest a shutdown may take place in the future, possibly within this century. While there are pockets of basal freezing beneath Ice Streams D and E, there are larger areas of basal melt that produce enough melt to more than offset the freezing, which is consistent with inferences of relatively steady flow for these ice streams over the last millennium.

scholarly journals Nucleation and seismic tremor associated with the glacial earthquakes of Whillans Ice Stream, Antarctica

2013 ◽  
Vol 40 (2) ◽  
pp. 312-315 ◽  
Author(s):  
J. Paul Winberry ◽  
Sridhar Anandakrishnan ◽  
Douglas A. Wiens ◽  
Richard B. Alley
Keyword(s):  
Ice Stream ◽  
Whillans Ice Stream

scholarly journals Mechanical and hydrologic properties of Whillans Ice Stream till: Implications for basal strength and stick-slip failure

2016 ◽  
Vol 121 (7) ◽  
pp. 1295-1309 ◽  
Author(s):  
J. R. Leeman ◽  
R. D. Valdez ◽  
R. B. Alley ◽  
S. Anandakrishnan ◽  
D. M. Saffer
Keyword(s):  
Stick Slip ◽  
Ice Stream ◽  
Whillans Ice Stream

Siple Coast subglacial aquatic environments: The Whillans Ice Stream Subglacial Access Research Drilling Project

2011 ◽  
pp. 199-219 ◽  
Author(s):  
Helen Amanda Fricker ◽  
Ross Powell ◽  
John Priscu ◽  
Slawek Tulaczyk ◽  
Sridhar Anandakrishnan ◽  
...  
Keyword(s):  
Aquatic Environments ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Drilling Project

Discovery of Till Deposition at the Grounding Line of Whillans Ice Stream

Science ◽  
2007 ◽  
Vol 315 (5820) ◽  
pp. 1835-1838 ◽  
Author(s):  
S. Anandakrishnan ◽  
G. A. Catania ◽  
R. B. Alley ◽  
H. J. Horgan
Keyword(s):  
Ice Stream ◽  
Whillans Ice Stream ◽  
Grounding Line

scholarly journals Continued deceleration of Whillans Ice Stream, West Antarctica

2005 ◽  
Vol 32 (22) ◽  
pp. n/a-n/a ◽  
Author(s):  
I. Joughin ◽  
R. A. Bindschadler ◽  
M. A. King ◽  
D. Voigt ◽  
R. B. Alley ◽  
...  
Keyword(s):  
West Antarctica ◽  
Ice Stream ◽  
Whillans Ice Stream

scholarly journals Scale independence of till rheology

2006 ◽  
Vol 52 (178) ◽  
pp. 377-380 ◽  
Author(s):  
Slawek Tulaczyk
Keyword(s):  
Characteristic Length ◽  
West Antarctica ◽  
Ice Flow ◽  
Length Scales ◽  
Ice Stream ◽  
In Situ Experiments ◽  
Whillans Ice Stream ◽  
Speed Up

AbstractRepresentation of till rheology in glaciological models of ice motion over deformable sediments has, until now, focused largely on two end-member cases: (1) linear, or mildly non-linear, viscous rheology and (2) (nearly) plastic rheology. Most laboratory and in situ experiments support the latter model. Hindmarsh (1997) and Fowler (2002, 2003) proposed that experimental results represent the behavior of small till samples (characteristic length scales of ~0.1 to ~1 m) but that till behaves viscously over length scales that are relevant to determination of ice-flow rates in glaciers and ice sheets (~1 km or more). Observations of short speed-up events on the ice plain of Whillans Ice Stream, West Antarctica, provide an opportunity to compare the in situ rheology of this till, integrated over ~10–100 km, with the rheology of till from beneath the same ice stream determined on small laboratory samples and in local borehole experiments. This comparison indicates that the rheology of the subglacial till beneath Whillans Ice Stream is independent of scale.

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