Results 21 to 30 of about 2,943 (230)

Filling and drainage of a subglacial lake beneath the Flade Isblink ice cap, northeast Greenland [PDF]

The Cryosphere, 2022
The generation, transport, storage and drainage of meltwater play important roles in the Greenland Ice Sheet (GrIS) subglacial system. Active subglacial lakes, common features in Antarctica, have recently been detected beneath the GrIS and may impact ice
Q. Liang, W. Xiao, I. Howat, I. Howat, X. Cheng, F. Hui, Z. Chen, M. Jiang, L. Zheng   +8 more
doaj   +1 more source

Subglacial Processes at Bondhusbreen, Norway: Preliminary Results [PDF]

Annals of Glaciology, 1983
Subglacial hydrology, sediment transport, pressure, and temperature have been studied beneath approximately 160 m of ice at Sondhusbreen, an outlet glacier from Folgefonni in south-western Norway.The volume of the mean annual water discharge passing through the study area is about 60x106 m3.
Jon Ove Hagen, Bjørn Wold, Olav Liestøl, Gunnar Østrem, Johan Ludvig Sollid   +4 more
openaire   +1 more source

Debris-bed friction during glacier sliding with ice–bed separation

Annals of Glaciology, 2019
Theory and experiments indicate that ice–bed separation during glacier slip over 2-D hard beds causes basal shear stress to reach a maximum at a particular slip velocity and decrease at higher velocities.
Neal R. Iverson, Christian Helanow, Lucas K. Zoet   +2 more
doaj   +1 more source

Subglacial lake activity beneath the ablation zone of the Greenland Ice Sheet [PDF]

The Cryosphere, 2023
Hydrologically active subglacial lakes can drain large volumes of water and sediment along subglacial pathways, affecting the motion and mass balance of ice masses and impacting downstream sediment dynamics.
Y. Fan, Y. Fan, Y. Fan, C.-Q. Ke, C.-Q. Ke, C.-Q. Ke, X. Shen, X. Shen, X. Shen, Y. Xiao, Y. Xiao, Y. Xiao, S. J. Livingstone, A. J. Sole   +13 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   +1 more source

Bed-type variability and till (dis)continuity beneath Thwaites Glacier, West Antarctica

Annals of Glaciology, 2019
Recent seismic measurements from upper Thwaites Glacier indicate that the bed-type variability is closely related to the along-flow basal topography. In high-relief subglacial highlands, stoss sides of topographic highs have a relatively higher acoustic ...
Atsuhiro Muto, Richard B. Alley, Byron R. Parizek, Sridhar Anandakrishnan   +3 more
doaj   +1 more source

Sedimentary Signatures of Persistent Subglacial Meltwater Drainage From Thwaites Glacier, Antarctica

Frontiers in Earth Science, 2022
Subglacial meltwater drainage can enhance localized melting along grounding zones and beneath the ice shelves of marine-terminating glaciers. Efforts to constrain the evolution of subglacial hydrology and the resulting influence on ice stability in space
A. P. Lepp, L. M. Simkins, J. B. Anderson, R. W. Clark, J. S. Wellner, C-D. Hillenbrand, J. A. Smith, A. A. Lehrmann, R. Totten, R. D. Larter, K. A. Hogan, F. O. Nitsche, A. G. C. Graham, L. Wacker   +13 more
doaj   +1 more source

The "tipping" temperature within Subglacial Lake Ellsworth, West Antarctica and its implications for lake access. [PDF]

, 2011
We present results from new geophysical data allowing modelling of the water flow within Subglacial Lake Ellsworth (SLE), West Antarctica. Our simulations indicate that this lake has a novel temperature distribution due to significantly thinner ice than ...
Woodward, J., Mayer, Christoph, Woodward, John, Smith, A.M., Smith, Andrew, Ross, Neil, Thoma, M., Ross, N., K. Grosfeld, Grosfeld, Klaus, C. Mayer, N. Ross, M. Thoma, Smith, A. M., Mayer, C., Grosfeld, K., Smith, Andy, A. M. Smith, J. Woodward, Thoma, Malte   +19 more
core   +1 more source

Mechanical forcing of water pressure in a hydraulically isolated reach beneath Western Greenland's ablation zone

Annals of Glaciology, 2016
A suite of surface and basal measurements during and after borehole drilling is used to perform in situ investigation of the local basal drainage system and pressure forcing in western Greenland. Drill and borehole water temperature were monitored during
Toby W. Meierbachtol, Joel T. Harper, Neil F. Humphrey, Patrick J. Wright   +3 more
doaj   +1 more source

Chemical and isotopic switching within the subglacial environment of a high Arctic glacier. [PDF]

, 2006
Natural environmental isotopes of nitrate, sulphate and inorganic carbon are discussed in conjunction with major ion chemistry of subglacial runoff from a High Arctic glacier, Midre Lovénbreen, Svalbard. The chemical composition of meltwaters is observed
Hodson, Andrew, Heaton, Tim, Wynn, Peter M., Heaton, Tim H. E.   +3 more
core   +1 more source