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Ice tectonic deform...
Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet
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- Doyle, Sam H (author)
- Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK
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- Hubbard, Alun H (author)
- Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK
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- Dow, Christine F (author)
- Glaciology Group, College of Science, Swansea University, Swansea, SA2 8PP, UK
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- Jones, Glenn A (author)
- Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK
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- Fitzpatrick, Andrew (author)
- Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK
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- Gusmeroli, Alessio (author)
- Glaciology Group, College of Science, Swansea University, Swansea, SA2 8PP, UK
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- Kulessa, Bernd (author)
- Glaciology Group, College of Science, Swansea University, Swansea, SA2 8PP, UK
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- Lindbäck, Katrin (author)
- Uppsala universitet,Luft-, vatten- och landskapslära
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- Pettersson, Rickard (author)
- Uppsala universitet,Luft-, vatten- och landskapslära
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- Box, Jason E (author)
- Department of Geography, The Ohio State University, 1036 Derby Hall, 154 North Oval Mall, Columbus, Ohio 43210–1361, USA
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(creator_code:org_t)
- 2013-01-28
- 2013
- English.
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In: The Cryosphere. - : Copernicus GmbH. - 1994-0416 .- 1994-0424. ; 7:1, s. 129-140
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http://www.the-cryos...
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https://www.the-cryo...
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https://doi.org/10.5...
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Abstract
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- We present detailed records of lake discharge, ice motion and passive seismicity capturing the behaviour and processes preceding, during and following the rapid drainage of a 4 km2 supraglacial lake through 1.1-km-thick ice on the western margin of the Greenland Ice Sheet. Peak discharge of 3300 m3 s−1 coincident with maximal rates of vertical uplift indicates that surface water accessed the ice–bed interface causing widespread hydraulic separation and enhanced basal motion. The differential motion of four global positioning system (GPS) receivers located around the lake record the opening and closure of the fractures through which the lake drained. We hypothesise that the majority of discharge occurred through a 3-km-long fracture with a peak width averaged across its wetted length of 0.4 m. We argue that the fracture's kilometre-scale length allowed rapid discharge to be achieved by combining reasonable water velocities with sub-metre fracture widths. These observations add to the currently limited knowledge of in situ supraglacial lake drainage events, which rapidly deliver large volumes of water to the ice–bed interface.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- glaciology
- greenland
- supraglacial
- climate
- Naturgeografi
- Physical Geography
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Doyle, Sam H
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Hubbard, Alun H
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Dow, Christine F
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Jones, Glenn A
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Fitzpatrick, And ...
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Gusmeroli, Aless ...
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show more...
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Kulessa, Bernd
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Lindbäck, Katrin
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Pettersson, Rick ...
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Box, Jason E
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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The Cryosphere
- By the university
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Uppsala University