Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream
A major meltwater body exists beneath a tributary of Bindschadler Ice Stream, West Antarctica, in a region where subglacial lakes have not been mapped but near where rapid vertical motion of the ice sheet surface has suggested shifting of a subglacial water body. The water is trapped by a local reve...
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Geological Soc America
2007
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Online Access: | https://doi.org/10.1130/G23222A.1 http://ecite.utas.edu.au/103887 |
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ftunivtasecite:oai:ecite.utas.edu.au:103887 2023-05-15T14:03:25+02:00 Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream Peters, LE Anandakrishnan, S Alley, RB Smith, AM 2007 application/pdf https://doi.org/10.1130/G23222A.1 http://ecite.utas.edu.au/103887 en eng Geological Soc America http://ecite.utas.edu.au/103887/1/Peters_et_al_[2007_Geology].pdf http://dx.doi.org/10.1130/G23222A.1 Peters, LE and Anandakrishnan, S and Alley, RB and Smith, AM, Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream, Geology, 35, (3) pp. 251-254. ISSN 0091-7613 (2007) [Refereed Article] http://ecite.utas.edu.au/103887 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2007 ftunivtasecite https://doi.org/10.1130/G23222A.1 2019-12-13T22:05:19Z A major meltwater body exists beneath a tributary of Bindschadler Ice Stream, West Antarctica, in a region where subglacial lakes have not been mapped but near where rapid vertical motion of the ice sheet surface has suggested shifting of a subglacial water body. The water is trapped by a local reversal in ice-air surface slope arising from ice flow over variable basal topography and from the positive feedback of basal lubrication from the trapped water. Strong variations in the water content of the sediments upglacier of the water body arise from a similar process. These results are revealed by a novel application of the amplitude variation with offset (AVO) seismic technique. The existence of such water bodies and of the strong spatial variation in subglacial sediment properties is not captured in current models of subglacial hydrology, lubrication of ice stream motion, and sediment transport. Article in Journal/Newspaper Antarc* Antarctic Antarctica Bindschadler Ice Stream Ice Sheet West Antarctica eCite UTAS (University of Tasmania) Antarctic Bindschadler Ice Stream ENVELOPE(-142.000,-142.000,-81.000,-81.000) West Antarctica Geology 35 3 251 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Peters, LE Anandakrishnan, S Alley, RB Smith, AM Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
A major meltwater body exists beneath a tributary of Bindschadler Ice Stream, West Antarctica, in a region where subglacial lakes have not been mapped but near where rapid vertical motion of the ice sheet surface has suggested shifting of a subglacial water body. The water is trapped by a local reversal in ice-air surface slope arising from ice flow over variable basal topography and from the positive feedback of basal lubrication from the trapped water. Strong variations in the water content of the sediments upglacier of the water body arise from a similar process. These results are revealed by a novel application of the amplitude variation with offset (AVO) seismic technique. The existence of such water bodies and of the strong spatial variation in subglacial sediment properties is not captured in current models of subglacial hydrology, lubrication of ice stream motion, and sediment transport. |
format |
Article in Journal/Newspaper |
author |
Peters, LE Anandakrishnan, S Alley, RB Smith, AM |
author_facet |
Peters, LE Anandakrishnan, S Alley, RB Smith, AM |
author_sort |
Peters, LE |
title |
Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
title_short |
Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
title_full |
Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
title_fullStr |
Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
title_full_unstemmed |
Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream |
title_sort |
extensive storage of basal meltwater in the onset region of a major west antarctic ice stream |
publisher |
Geological Soc America |
publishDate |
2007 |
url |
https://doi.org/10.1130/G23222A.1 http://ecite.utas.edu.au/103887 |
long_lat |
ENVELOPE(-142.000,-142.000,-81.000,-81.000) |
geographic |
Antarctic Bindschadler Ice Stream West Antarctica |
geographic_facet |
Antarctic Bindschadler Ice Stream West Antarctica |
genre |
Antarc* Antarctic Antarctica Bindschadler Ice Stream Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Bindschadler Ice Stream Ice Sheet West Antarctica |
op_relation |
http://ecite.utas.edu.au/103887/1/Peters_et_al_[2007_Geology].pdf http://dx.doi.org/10.1130/G23222A.1 Peters, LE and Anandakrishnan, S and Alley, RB and Smith, AM, Extensive storage of basal meltwater in the onset region of a major West Antarctic ice stream, Geology, 35, (3) pp. 251-254. ISSN 0091-7613 (2007) [Refereed Article] http://ecite.utas.edu.au/103887 |
op_doi |
https://doi.org/10.1130/G23222A.1 |
container_title |
Geology |
container_volume |
35 |
container_issue |
3 |
container_start_page |
251 |
_version_ |
1766274071435149312 |