Results 21 to 30 of about 996,477 (244)

Deformation in Rutford Ice Stream, West Antarctica: measuring shear-wave anisotropy from icequakes [PDF]

, 2013
Ice streams provide major drainage pathways for the Antarctic ice sheet. The stress distribution and style of flow in such ice streams produce elastic and rheological anisotropy, which informs ice-flow modelling as to how ice masses respond to external
Baird, A.F., Smith, A.M., Baird, A F, Stuart, G.W., Harland, S. R., Stuart, G. W., Kendall, J-M, Pritchard, H.D., Harland, S.R., Smith, A. M., Pritchard, H. D., Kendall, J.-M., Brisbourne, A.M., Brisbourne, A. M., Lloyd, G.E., Lloyd, G. E.   +15 more
core   +1 more source

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

Potential subglacial lake locations and meltwater drainage pathways beneath the Antarctic and Greenland ice sheets [PDF]

, 2013
We use the Shreve hydraulic potential equation as a simplified approach to investigate potential subglacial lake locations and meltwater drainage pathways beneath the Antarctic and Greenland ice sheets. We validate the method by demonstrating its ability
Clark, Chris, Woodward, J., Livingstone, Stephen, Woodward, John, Clark, C.D., Kingslake, J., Livingstone, S.J., Livingstone, S. J., Clark, C. D., J. Kingslake, Kingslake, Jonathan, C. D. Clark, S. J. Livingstone, J. Woodward   +13 more
core   +2 more sources

Ice flow dynamics of the northwestern Laurentide Ice Sheet during the last deglaciation [PDF]

The Cryosphere
Reconstructions of palaeo-ice-stream activity provide insight into the processes governing ice stream evolution over millennial timescales. The northwestern sector of the Laurentide Ice Sheet experienced a period of rapid retreat driven by warming during
B. J. Stoker, H. E. Dulfer, H. E. Dulfer, C. R. Stokes, V. H. Brown, V. H. Brown, C. D. Clark, C. Ó Cofaigh, D. J. A. Evans, D. Froese, S. L. Norris, M. Margold   +11 more
doaj   +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

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

The role of subglacial hydrology in ice streams with elevated geothermal heat flux

Journal of Glaciology, 2020
The spatial distribution of geothermal heat flux (GHF) under ice sheets is largely unknown. Nonetheless, it is an important boundary condition in ice-sheet models, and suggested to control part of the complex surface velocity patterns observed in some ...
Silje Smith-Johnsen, Basile de Fleurian, Kerim H. Nisancioglu   +2 more
doaj   +1 more source

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

Subglacial hydrology regulates oscillations in marine ice streams [PDF]

The Cryosphere
Marine ice stream dynamics are sensitive to conditions at the grounding line and basal shear stress. Variations in subglacial hydrology have been implicated in ice stream speed-up and shutdown.
M. Haseloff, I. J. Hewitt, R. F. Katz
doaj   +1 more source

Ice stream subglacial access for ice sheet history and fast ice flow: The BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions [PDF]

, 2021
Three holes were drilled to the bed of Rutford Ice Stream, through ice up to 2154 m thick, to investigate the basal processes and conditions associated with fast ice flow and the glacial history of the West Antarctic Ice Sheet.
Murray, T., Anker, P.G.D., Smith, A.M., Tavi Murray, Nicholls, K.W., Makinson, K., Brisbourne, A.M., Hodgson, D.A., Schlegel, R., Rios-Costas, S., Rebecca Schlegel, Anandkrishnan, S.   +11 more
core   +1 more source