Results 21 to 30 of about 546 (164)

Basal conditions of Denman Glacier from glacier hydrology and ice dynamics modeling [PDF]

The Cryosphere, 2023
Basal sliding in Antarctic glaciers is often modeled using a friction law that relates basal shear stresses to the effective pressure. As few ice sheet models are dynamically coupled to subglacial hydrology models, variability in subglacial hydrology ...
K. McArthur, F. S. McCormack, C. F. Dow, C. F. Dow   +3 more
doaj   +1 more source

Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier

Journal of Glaciology, 2023
Hydrologic pathways beneath ice sheets and glaciers play an important role in regulating ice flow. Antarctica has experienced, and will continue to experience, changes in ice dynamics and geometry, but the associated changes in subglacial hydrology have ...
Anna-Mireilla Hayden, Christine F. Dow
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
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Persistent, extensive channelized drainage modeled beneath Thwaites Glacier, West Antarctica [PDF]

The Cryosphere, 2022
Subglacial hydrology is a leading control on basal friction and the dynamics of glaciers and ice sheets. At low discharge, subglacial water flows through high-pressure, sheet-like systems that lead to low effective pressures.
A. O. Hager, A. O. Hager, M. J. Hoffman, S. F. Price, D. M. Schroeder, D. M. Schroeder   +5 more
doaj   +1 more source

Subglacial Freshwater Drainage Increases Simulated Basal Melt of the Totten Ice Shelf

Geophysical Research Letters, 2023
Subglacial freshwater discharge from beneath Antarctic glaciers likely has a strong impact on ice shelf basal melting. However, the difficulty in directly observing subglacial flow highlights the importance of modeling these processes.
David E. Gwyther, Christine F. Dow, Stefan Jendersie, Noel Gourmelen, Benjamin K. Galton‐Fenzi   +4 more
doaj   +1 more source

Recent advances in understanding Antarctic subglacial lakes and hydrology [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2016
It is now well documented that over 400 subglacial lakes exist across the bed of the Antarctic Ice Sheet. They comprise a variety of sizes and volumes (from the approx. 250 km long Lake Vostok to bodies of water less than 1 km in length), relate to a number of discrete topographic settings (from those contained within valleys to lakes that reside in ...
Siegert MJ, Ross N, LeBrocq A
openaire   +3 more sources

Seasonal Acceleration of Petermann Glacier, Greenland, From Changes in Subglacial Hydrology

Geophysical Research Letters, 2023
Petermann Glacier is a major outlet glacier of northern Greenland that drains a marine‐based basin vulnerable to destabilization from enhanced oceanic and atmospheric forcings. Using satellite radar interferometry data from the Sentinel‐1a/b missions, we
Shivani Ehrenfeucht, Mathieu Morlighem, Eric Rignot, Christine F. Dow, Jeremie Mouginot   +4 more
doaj   +1 more source

Englacial and Subglacial Hydrology, Austre Okstindbreen, Norway [PDF]

Journal of Glaciology, 1979
Abstract The efficiency of drainage systems within the glacier Austre Okstindbreen apparently increases as the summer progresses. As the transient equilibrium line moves up-glacier and the main system extends headwards, several systems may join together.
W. H. Theakstone, N. Tvis Knudsen
openaire   +1 more source

The organization of subglacial drainage during the demise of the Finnish Lake District Ice Lobe [PDF]

The Cryosphere
Unknown basal characteristics limit our ability to simulate the subglacial hydrology of rapidly melting contemporary ice sheets. Sediment-based landforms generated beneath Late Pleistocene ice sheets, together with detailed digital elevation models ...
A. J. Hepburn, A. J. Hepburn, C. F. Dow, A. Ojala, J. Mäkinen, E. Ahokangas, J. Hovikoski, J.-P. Palmu, K. Kajuutti   +8 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