Results 161 to 170 of about 1,622 (202)

A common future amidst unknowns: an NSR forum on polar science. [PDF]

Natl Sci Rev
Zhu H.
europepmc   +1 more source

Assessing the subglacial lake coverage of Antarctica

, 2015
openaire   +1 more source

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 Siegert, Jamin Stevens Greenbaum, Jonathan Bamber   +2 more
exaly   +7 more sources

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Antarctic subglacial lakes

Earth-Science Reviews, 2000
Abstract Antarctic subglacial lakes were first identified by Robin et al. (1970) after airborne radio-echo sounding (RES) investigations of the ice-sheet interior. Recently, satellite altimetry was used to measure anomalous near-flat regions on the ice-sheet surface that represent a manifestation of the subglacial lake beneath.
Martin Siegert
exaly   +2 more sources

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

Theoretical framework and diagnostic criteria for the identification of palaeo-subglacial lakes [PDF]

Quaternary Science Reviews, 2012
The Antarctic Ice Sheet is underlain by numerous subglacial lakes, which comprise a significant and active component of its hydrological network. These lakes are widespread and occur at a range of scales under a variety of conditions.
Darrel A Swift, Jan Piotrowski, Chris Clark   +2 more
exaly   +3 more sources

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 Muir, Martin Siegert, Andrew 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 Siegert, Julian 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