Results 31 to 40 of about 471,781 (349)

Thermal controls on ice stream shear margins

Journal of Glaciology, 2021
Ice stream discharge responds to a balance between gravity, basal friction and lateral drag. Appreciable viscous heating occurs in shear margins between ice streams and adjacent slow-moving ice ridges, altering the temperature-dependent viscosity ...
Pierce Hunter, Colin Meyer, Brent Minchew, Marianne Haseloff, Alan Rempel   +4 more
doaj   +1 more source

Upstream flow effects revealed in the EastGRIP ice core using Monte Carlo inversion of a two-dimensional ice-flow model [PDF]

The Cryosphere, 2021
The Northeast Greenland Ice Stream (NEGIS) is the largest active ice stream on the Greenland Ice Sheet (GrIS) and a crucial contributor to the ice-sheet mass balance.
T. A. Gerber, C. S. Hvidberg, S. O. Rasmussen, S. Franke, G. Sinnl, A. Grinsted, D. Jansen, D. Dahl-Jensen, D. Dahl-Jensen   +8 more
doaj   +1 more source

Variations in hydraulic efficiency of the subglacial drainage landsystem control surging and streaming regimes of outlet glaciers

Journal of Glaciology, 2023
Surging and streaming of glaciers are modulated by meltwater availability and pressure which controls mechanical coupling at their beds. Using laboratory-scale experimental modelling and palaeoglaciological mapping, we explore how subglacial drainage ...
Édouard Ravier, Thomas Lelandais, Jean Vérité, Olivier Bourgeois   +3 more
doaj   +1 more source

How dynamic are ice-stream beds? [PDF]

The Cryosphere, 2017
Abstract. Projections of sea-level rise contributions from West Antarctica's dynamically thinning ice streams contain high uncertainty because some of the key processes involved are extremely challenging to observe. An especially poorly observed parameter is sub-decadal stability of ice-stream beds, which may be important for subglacial traction, till ...
Damon Davies, Robert G. Bingham, Edward C. King, Andrew M. Smith, Alex M. Brisbourne, Matteo Spagnolo, Alastair G. C. Graham, Anna E. Hogg, David G. Vaughan   +8 more
openaire   +8 more sources

A thicker Antarctic ice stream during the mid-Pliocene warm period

Communications Earth & Environment, 2023
Ice streams regulate most ice mass loss in Antarctica. Determining ice stream response to warmer conditions during the Pliocene could provide insights into their future behaviour, but this is hindered by a poor representation of subglacial topography in ...
Martim Mas e Braga, Richard S. Jones, Jorge Bernales, Jane Lund Andersen, Ola Fredin, Mathieu Morlighem, Alexandria J. Koester, Nathaniel A. Lifton, Jonathan M. Harbor, Yusuke Suganuma, Neil F. Glasser, Irina Rogozhina, Arjen P. Stroeven   +12 more
doaj   +1 more source

Englacial Pore Water Localizes Shear in Temperate Ice Stream Margins [PDF]

, 2019
The margins of fast‐moving ice streams are characterized by steep velocity gradients. Some of these gradients cannot be explained by a temperature‐dependent viscosity alone.
Haseloff, Marianne, Hewitt, I. J., Katz, R. F.   +2 more
core   +2 more sources

Formation of ribbed bedforms below shear margins and lobes of palaeo-ice streams [PDF]

The Cryosphere, 2021
Conceptual ice stream land systems derived from geomorphological and sedimentological observations provide constraints on ice–meltwater–till–bedrock interactions on palaeo-ice stream beds. Within these land systems, the spatial distribution and formation
J. Vérité, É. Ravier, O. Bourgeois, S. Pochat, T. Lelandais, R. Mourgues, C. D. Clark, P. Bessin, D. Peigné, N. Atkinson   +9 more
doaj   +1 more source

Flow and retreat of the Late Quaternary Pine Island-Thwaites palaeo-ice stream, West Antarctica [PDF]

, 2010
Multibeam swath bathymetry and sub-bottom profiler data are used to establish constraints on the flow and retreat history of a major palaeo-ice stream that carried the combined discharge from the parts of the West Antarctic Ice Sheet now occupied by the ...
Alastair G. C. Graham, Alley, Anandakrishnan, Anderson, Anderson, Canals, Clark, Claus-Dieter Hillenbrand, Conway, Domack, Dowdeswell, Dowdeswell, Dowdeswell, Dowdeswell, Evans, Evans, Gerhard Kuhn, Graham, Heroy, Holt, Hubbard, Hughes, Jacobs, James A. Smith, Jeffrey Evans, Julian A. Dowdeswell, Karsten Gohl, King, Larter, Larter, Lowe, Lowe, Mosola, Nitsche, Noormets, Nygård, Ottesen, Ottesen, Payne, Pritchard, Pudsey, Rignot, Rignot, Rignot, Rignot, Rignot, Robert D. Larter, Schoof, Scott, Sharpe, Shaw, Shepherd, Shepherd, Shipp, Shipp, Smith, Stokes, Stokes, Stokes, Tara Deen, Thoma, Vaughan, Vaughan, Vaughan, Vaughan, Walker, Weertman, Wellner, Ó Cofaigh, Ó Cofaigh, Ó Cofaigh, Ó Cofaigh   +71 more
core   +1 more source

Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica

Annals of Glaciology, 2020
Numerical ice-sheet models are commonly matched to surface ice velocities from InSAR measurements by modifying basal drag, allowing the flow and form of the ice sheet to be simulated. Geophysical measurements of the bed are rarely used to examine if this
Hafeez Jeofry, Neil Ross, Martin J. Siegert   +2 more
doaj   +1 more source

Tidal influence on Rutford Ice Stream, West Antarctica: observations of surface flow and basal processes from closely-spaced GPS and passive seismic stations [PDF]

, 2008
High-resolution surface velocity measurements and passive seismic observations from Rutford Ice Stream, West Antarctica, 40 km upstream from the grounding line are presented.
A.E. Behar, A.M. Smith, Doake, Doake, Frolich, G. Aðalgeirsdóttir, K. Makinson, K.W. Nicholls, M.A. King, Pugh, Rignot, T. Murray   +11 more
core   +2 more sources