Results 101 to 110 of about 7,235 (213)

Modeling δD-δ18O Steady-State of Well-Sealed Perennially Ice-Covered Lakes and Their Recharge Source: Examples From Lake Untersee and Lake Vostok, Antarctica

Frontiers in Earth Science, 2020
Perennially ice-covered lakes that are tightly sealed from the atmosphere represent a unique group of polar lakes. In these lakes, the δD-δ18O evolution of the water column and steady-state conditions are controlled by rates of recharge and freezing at ...
Benoit Faucher, Denis Lacelle, David A. Fisher, Klemens Weisleitner, Dale T. Andersen   +4 more
doaj   +1 more source

Final Report: Lake Vostok: A Curiosity or a Focus for Interdisciplinary Study? [PDF]

, 1999
The goal of the NSF-sponsored workshop, held in held in Washington, D.C., on November 7-8, 1998, was to stimulate discussion within the U.S. science community on Lake Vostok, specifically addressing the question: "Is Lake Vostok a natural curiosity or an
Bell, Robin E., Karl, David M.
core   +2 more sources

Morphology and distribution of lakes under the Laurentide Ice Sheet: implications for ice flow dynamics

Boreas, Volume 55, Issue 2, Page 422-442, April 2026.
This study examines the distribution and morphology of lakes under the Laurentide Ice Sheet (LIS) to investigate relationships with ice flow velocity, bedrock and basal thermal regime. Palaeo‐ice streams and lobes were important components of the LIS, and properties of lakes in those regions are quantified at high resolution.
Sarah M. Principato, Carissa M. Mobley
wiley   +1 more source

Entrained Water in Basal Ice Suppresses Radar Bed‐Echo Power at Active Subglacial Lakes

Geophysical Research Letters
Subglacial lakes have been mapped across Antarctica with two methods, radio‐echo sounding (RES) and ice‐surface deformation. At sites where both are coincident, these methods typically provide conflicting interpretations about the ice‐bed interface. With
B. H. Hills, M. R. Siegfried, D. M. Schroeder   +2 more
doaj   +1 more source

Freezing of ridges and water networks preserves the Gamburtsev Subglacial Mountains for millions of years [PDF]

, 2014
Once an ice sheet grows beyond a critical thickness, the basal thermal regime favors melting and development of subglacial water networks. Subglacial water is necessary for bedrock erosion, but the exact mechanisms that lead to preservation of subglacial
Alley, Alley, Bamber, Bell, Bo, Brozović, Budd, Carol Finn, Cohen, Cox, Creyts, Cuffey, Cuffey, David Braaten, DeConto, Detlef Damaske, Egholm, Fausto Ferraccioli, Ferraccioli, Fricker, Hallet, Hallet, Hambrey, Herman, Hooke, Hugh Corr, Jamieson, Kathryn C. Rose, Kleman, Lawson, Marshall, Marshall, Michael Wolovick, Molnar, Nicholas Frearson, Pedersen, Roberts, Robin E. Bell, Rose, Shapiro, Shreve, Shuster, Staiger, Strahler, Sugden, Thomson, Thomson, Timothy T. Creyts, Tom Jordan, Wilson, Wolovick, Zachos, Zachos   +52 more
core   +2 more sources

Stratigraphic Architecture and Sediment Facies of the Western Oak Ridges Moraine, Humber River Watershed, Southern Ontario [PDF]

, 2004
The Oak Ridges Moraine in southern Ontario is a ca. 160 km long east-west trending ridge of sand and gravel situated north of Lake Ontario. Study of the Oak Ridges Moraine in the Humber River watershed was undertaken to assess its role in the groundwater
Arnott, Robert W.C., Russell, Hazen A.J., Sharpe, David R.   +2 more
core   +1 more source

Morphological properties of tunnel valleys of the southern sector of the Laurentide Ice Sheet and implications for their formation [PDF]

, 2016
Tunnel valleys have been widely reported on the bed of former ice sheets and are considered an important expression of subglacial meltwater drainage.
Clark, C.D., Livingstone, S.J.
core   +3 more sources

Long-term variability of proglacial groundwater-fed hydrological systems in an area of glacier retreat, Skeioararsandur, Iceland [PDF]

, 2015
Proglacial groundwater‐fed features, such as seeps, substantially impact proglacial geomorphology, hydrology, and ecology. However, there is a paucity of research on the impacts of climate change and glacier retreat on the extent of these important ...
Bahr, Bennett, Björnsson, Björnsson, Björnsson, Blaen, Blaen, Boulton, Boulton, Bradwell, Brown, Brown, Brown, Brown, Cooper, Cooper, Crossman, Crossman, Dragon, Drexler, Evans, Everest, Fay, Finger, Flowers, Flowers, Freeze, Glaser, Gremaud, Gremaud, Guðmundsson, Guðmundsson, Guðmundsson, Haldorsen, Haldorsen, Hodgkins, Jacobsen, Jerome, Jerome, Jude-Eton, Jumpponen, Kamb, Kellerer-Pirklbauer, Langston, Langston, Magilligan, Magnusson, Makridakis, Malard, Marren, Marren, Marren, Marren, Marteinsdóttir, Marteinsdóttir, Milner, Milner, Nield, Pagli, Piotrowski, Pálsson, Robinson, Robinson, Robinson, Roy, Roy, Russell, Russell, Rutter, Solberg, Thompson, Thompson, Thordarson, Thornthwaite, Tóth, Tóth, Tóth, Van Dijk, Waller, Ward, Wiśniewski, Wolfe   +81 more
core   +1 more source

On the factors and the degree of their effect on subglacial melt and changes in the state of Antarctic subglacial lakes

Arctic, Antarctic, and Alpine Research
This study presents the results of mathematical modeling of the degree of effects of various characteristics on basal conditions in Antarctica. The model is based on the numerical solution of the one-dimensional Stefan problem.
Alina Boronina, Sergey Popov, Gang Qiao
doaj   +1 more source

Preliminary Analysis of Life within a Former Subglacial Lake Sediment in Antarctica

Diversity, 2013
Since the first descriptions of Antarctic subglacial lakes, there has been a growing interest and awareness of the possibility that life will exist and potentially thrive in these unique and little known environments. The unusual combination of selection
Gavin Burns, Charles S. Cockell, Michael A. S. Thorne, Dominic A. Hodgson, David A. Pearce   +4 more
doaj   +1 more source