Results 151 to 160 of about 862,051 (192)

Subglacial Lakes and Jökulhlaups in Iceland

Global and Planetary Change, 2003
Active volcanoes and hydrothermal systems underlie ice caps in Iceland. Glacier-volcano interactions produce meltwater that either drains toward the glacier margin or accumulates in subglacial lakes. Accumulated meltwater drains periodically in jokulhlaups from the subglacial lakes and occasionally during volcanic eruptions.
Helgi Björnsson
exaly   +2 more sources

Greenland Subglacial Lakes Detected by Radar [PDF]

Geophysical Research Letters, 2013
AbstractSubglacial lakes are an established and important component of the basal hydrological system of the Antarctic ice sheets, but none have been reported from Greenland. Here we present airborne radio echo sounder (RES) measurements that provide the first clear evidence for the existence of subglacial lakes in Greenland.
Martin J. Siegert, Jamin S. Greenbaum, Jonathan L. Bamber   +2 more
exaly   +3 more sources

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Rapid Discharge Connects Antarctic Subglacial Lakes

Nature, 2006
The existence of many subglacial lakes provides clear evidence for the widespread presence of water beneath the East Antarctic ice sheet, but the hydrology beneath this ice mass is poorly understood. Such knowledge is critical to understanding ice flow, basal water transfer to the ice margin, glacial landform development and subglacial lake habitats ...
Alan A. Muir, Martin J. Siegert, Andrew P. Shepherd   +2 more
exaly   +4 more sources

Cascades of subglacial lakes in Antarctica

Doklady Earth Sciences, 2012
Progress in understanding cascades of subglacial lakes in Antarctica and in the dynamics of their surface was derived using satellite laser altimetry measurements ICESat. The morphological and dynamical signs indicate subglacial lakes and the positions of their shore lines. Oscillations of surfaces in transition zones are periodic, while the changes in
V. M. Kotlyakov, L. N. Vasiliev, A. B. Kachalin, M. Yu. Moskalevsky, A. S. Tyuflin   +4 more
openaire   +1 more source

The Physiography of Modern Antarctic Subglacial Lakes

Global and Planetary Change, 2003
The size and distribution of Antarctic subglacial lakes have been investigated using airborne radio-echo sounding (RES) and satellite radar altimetry. Over 70 lakes have been identified beneath the ice sheet from distinctive, mirror-like reflectors observed on RES records.
Martin J. Siegert, Julian A. Dowdeswell
exaly   +2 more sources

Deep Clustering in Subglacial Reflections Reveals New Insight into Subglacial Lakes

2023
Radar images imply subglacial features, including distinct reflections from ice bottom. Different from bedrock interfaces, subglacial lakes generally display smooth and continuous highlights as a special type of ice bottom reflectors in radar images. In this study, we construct a dataset of ice bottom reflectors based on CReSIS radar sounder dataset. A
Sheng Dong, Lei Fu
openaire   +1 more source

On the formation of large subglacial lakes

Canadian Journal of Earth Sciences, 1991
The role of subglacial water storage beneath continental ice sheets is investigated, primarily for a deformable bed. Subglacial ponding is shown to occur under most regions of warm-based ice sheets, and large subglacial lakes can become established, for example in the Hudson Bay basin.
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A fourth inventory of Antarctic subglacial lakes

Antarctic Science, 2012
Abstract Antarctic subglacial lakes are studied for three main scientific reasons. First, they form an important component of the basal hydrological system which is known to affect the dynamics of the ice sheet. Second, they are amongst the most extreme viable habitats on Earth and third, if sediments exist on their floors, they may ...
Andrew Wright, Martin Siegert
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The ice topography over subglacial lakes

Cold Regions Science and Technology, 1990
Abstract A model is developed which relates the ice-surface topography above subglacial lakes to the length l of bed transition regions bordering the lake where the effect of the presence of the lake causes a reduction in basal shear stress. The model is applied to four representative regions of an ice sheet.
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Subglacial Lakes and Their Changing Role in a Warming Climate

Nature Reviews Earth & Environment, 2022
Andrew J. Sole, Felix Ng
exaly