Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica
The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at the ice stream bed. Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former...
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ftnerc:oai:nora.nerc.ac.uk:8456 2024-02-11T09:55:18+01:00 Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica Larter, R.D. Graham, A.G.C. Gohl, K. Kuhn, G. Hillenbrand, C.-D. Smith, J.A. Deen, T.J. Livermore, R.A. Schenke, H.-W. 2009 http://nora.nerc.ac.uk/id/eprint/8456/ https://doi.org/10.1130/G25505A.1 unknown Larter, R.D. orcid:0000-0002-8414-7389 Graham, A.G.C.; Gohl, K.; Kuhn, G.; Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Smith, J.A. orcid:0000-0002-1333-2544 Deen, T.J.; Livermore, R.A.; Schenke, H.-W. 2009 Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica. Geology, 37 (5). 411-414. https://doi.org/10.1130/G25505A.1 <https://doi.org/10.1130/G25505A.1> Glaciology Earth Sciences Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1130/G25505A.1 2024-01-26T00:03:20Z The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at the ice stream bed. Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former bed can be imaged using modern swath sonar tools. We present new multibeam swath bathymetry data analyzed alongside sparse preexisting data from the Amundsen Sea embayment. The compilation is the most extensive, continuous area of multi-beam data coverage yet obtained on the inner continental shelf of Antarctica. The data reveal streamlined subglacial bedforms that define a zone of paleo–ice stream convergence, but, in contrast to previous models, do not show a simple downflow progression of bedform types along paleo–ice stream troughs. We interpret high spatial variability of bedforms as indicating a complex mechanical and hydrodynamic regime at the former ice stream beds, consistent with observations from some modern ice streams. We conclude that care must be taken when using bedforms to infer paleo–ice stream velocities. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica West Antarctica Natural Environment Research Council: NERC Open Research Archive Amundsen Sea West Antarctica Geology 37 5 411 414 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology Earth Sciences |
spellingShingle |
Glaciology Earth Sciences Larter, R.D. Graham, A.G.C. Gohl, K. Kuhn, G. Hillenbrand, C.-D. Smith, J.A. Deen, T.J. Livermore, R.A. Schenke, H.-W. Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
topic_facet |
Glaciology Earth Sciences |
description |
The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at the ice stream bed. Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former bed can be imaged using modern swath sonar tools. We present new multibeam swath bathymetry data analyzed alongside sparse preexisting data from the Amundsen Sea embayment. The compilation is the most extensive, continuous area of multi-beam data coverage yet obtained on the inner continental shelf of Antarctica. The data reveal streamlined subglacial bedforms that define a zone of paleo–ice stream convergence, but, in contrast to previous models, do not show a simple downflow progression of bedform types along paleo–ice stream troughs. We interpret high spatial variability of bedforms as indicating a complex mechanical and hydrodynamic regime at the former ice stream beds, consistent with observations from some modern ice streams. We conclude that care must be taken when using bedforms to infer paleo–ice stream velocities. |
format |
Article in Journal/Newspaper |
author |
Larter, R.D. Graham, A.G.C. Gohl, K. Kuhn, G. Hillenbrand, C.-D. Smith, J.A. Deen, T.J. Livermore, R.A. Schenke, H.-W. |
author_facet |
Larter, R.D. Graham, A.G.C. Gohl, K. Kuhn, G. Hillenbrand, C.-D. Smith, J.A. Deen, T.J. Livermore, R.A. Schenke, H.-W. |
author_sort |
Larter, R.D. |
title |
Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
title_short |
Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
title_full |
Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
title_fullStr |
Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
title_full_unstemmed |
Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica |
title_sort |
subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, amundsen sea embayment, west antarctica |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/8456/ https://doi.org/10.1130/G25505A.1 |
geographic |
Amundsen Sea West Antarctica |
geographic_facet |
Amundsen Sea West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica West Antarctica |
op_relation |
Larter, R.D. orcid:0000-0002-8414-7389 Graham, A.G.C.; Gohl, K.; Kuhn, G.; Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Smith, J.A. orcid:0000-0002-1333-2544 Deen, T.J.; Livermore, R.A.; Schenke, H.-W. 2009 Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea embayment, West Antarctica. Geology, 37 (5). 411-414. https://doi.org/10.1130/G25505A.1 <https://doi.org/10.1130/G25505A.1> |
op_doi |
https://doi.org/10.1130/G25505A.1 |
container_title |
Geology |
container_volume |
37 |
container_issue |
5 |
container_start_page |
411 |
op_container_end_page |
414 |
_version_ |
1790594930276564992 |