Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica
Increasing evidence for an elaborate subglacial drainage network underneath modern Antarctic ice sheets suggests that basal meltwater has an important influence on ice stream flow. Swath bathymetry surveys from previously glaciated continental margins display morphological features indicative of sub...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications on behalf of the European Geosciences Union
2013
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Online Access: | http://nora.nerc.ac.uk/id/eprint/500761/ https://nora.nerc.ac.uk/id/eprint/500761/1/tc-7-249-2013.pdf https://doi.org/10.5194/tc-7-249-2013 |
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ftnerc:oai:nora.nerc.ac.uk:500761 2023-05-15T13:23:51+02:00 Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica Nitsche, F.O. Gohl, K. Larter, R.D. Hillenbrand, C.-D. Kuhn, G. Smith, J.A. Jacobs, S. Anderson, J.B. Jakobsson, M. 2013-02-08 text http://nora.nerc.ac.uk/id/eprint/500761/ https://nora.nerc.ac.uk/id/eprint/500761/1/tc-7-249-2013.pdf https://doi.org/10.5194/tc-7-249-2013 en eng Copernicus Publications on behalf of the European Geosciences Union https://nora.nerc.ac.uk/id/eprint/500761/1/tc-7-249-2013.pdf Nitsche, F.O.; Gohl, K.; Larter, R.D. orcid:0000-0002-8414-7389 Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Kuhn, G.; Smith, J.A. orcid:0000-0002-1333-2544 Jacobs, S.; Anderson, J.B.; Jakobsson, M. 2013 Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica. The Cryosphere, 7 (1). 249-262. https://doi.org/10.5194/tc-7-249-2013 <https://doi.org/10.5194/tc-7-249-2013> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.5194/tc-7-249-2013 2023-02-04T19:36:31Z Increasing evidence for an elaborate subglacial drainage network underneath modern Antarctic ice sheets suggests that basal meltwater has an important influence on ice stream flow. Swath bathymetry surveys from previously glaciated continental margins display morphological features indicative of subglacial meltwater flow in inner shelf areas of some paleo ice stream troughs. Over the last few years several expeditions to the eastern Amundsen Sea embayment(West Antarctica) have investigated the paleo ice streams that extended from the Pine Island and Thwaites glaciers. A compilation of high-resolution swath bathymetry data from inner Pine Island Bay reveals details of a rough seabed topography including several deep channels that connect a series of basins. This complex basin and channel network is indicative of meltwater flow beneath the paleo-Pine Island and Thwaites ice streams, along with substantial subglacial water inflow from the east. This meltwater could have enhanced ice flow over the rough bedrock topography. Meltwater features diminish with the onset of linear features north of the basins. Similar features have previously been observed in several other areas, including the Dotson-Getz Trough (western Amundsen Sea embayment) and Marguerite Bay (SW Antarctic Peninsula), suggesting that these features may be widespread around the Antarctic margin and that subglacial meltwater drainage played a major role in past ice-sheet dynamics. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Pine Island Pine Island Bay The Cryosphere West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula West Antarctica Amundsen Sea Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Dotson-Getz Trough ENVELOPE(-114.775,-114.775,-73.231,-73.231) The Cryosphere 7 1 249 262 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Increasing evidence for an elaborate subglacial drainage network underneath modern Antarctic ice sheets suggests that basal meltwater has an important influence on ice stream flow. Swath bathymetry surveys from previously glaciated continental margins display morphological features indicative of subglacial meltwater flow in inner shelf areas of some paleo ice stream troughs. Over the last few years several expeditions to the eastern Amundsen Sea embayment(West Antarctica) have investigated the paleo ice streams that extended from the Pine Island and Thwaites glaciers. A compilation of high-resolution swath bathymetry data from inner Pine Island Bay reveals details of a rough seabed topography including several deep channels that connect a series of basins. This complex basin and channel network is indicative of meltwater flow beneath the paleo-Pine Island and Thwaites ice streams, along with substantial subglacial water inflow from the east. This meltwater could have enhanced ice flow over the rough bedrock topography. Meltwater features diminish with the onset of linear features north of the basins. Similar features have previously been observed in several other areas, including the Dotson-Getz Trough (western Amundsen Sea embayment) and Marguerite Bay (SW Antarctic Peninsula), suggesting that these features may be widespread around the Antarctic margin and that subglacial meltwater drainage played a major role in past ice-sheet dynamics. |
format |
Article in Journal/Newspaper |
author |
Nitsche, F.O. Gohl, K. Larter, R.D. Hillenbrand, C.-D. Kuhn, G. Smith, J.A. Jacobs, S. Anderson, J.B. Jakobsson, M. |
spellingShingle |
Nitsche, F.O. Gohl, K. Larter, R.D. Hillenbrand, C.-D. Kuhn, G. Smith, J.A. Jacobs, S. Anderson, J.B. Jakobsson, M. Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
author_facet |
Nitsche, F.O. Gohl, K. Larter, R.D. Hillenbrand, C.-D. Kuhn, G. Smith, J.A. Jacobs, S. Anderson, J.B. Jakobsson, M. |
author_sort |
Nitsche, F.O. |
title |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
title_short |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
title_full |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
title_fullStr |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
title_full_unstemmed |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
title_sort |
paleo ice flow and subglacial meltwater dynamics in pine island bay, west antarctica |
publisher |
Copernicus Publications on behalf of the European Geosciences Union |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/500761/ https://nora.nerc.ac.uk/id/eprint/500761/1/tc-7-249-2013.pdf https://doi.org/10.5194/tc-7-249-2013 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(-114.775,-114.775,-73.231,-73.231) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Amundsen Sea Marguerite Marguerite Bay Island Bay Pine Island Bay Getz Dotson-Getz Trough |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Amundsen Sea Marguerite Marguerite Bay Island Bay Pine Island Bay Getz Dotson-Getz Trough |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Pine Island Pine Island Bay The Cryosphere West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Pine Island Pine Island Bay The Cryosphere West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/500761/1/tc-7-249-2013.pdf Nitsche, F.O.; Gohl, K.; Larter, R.D. orcid:0000-0002-8414-7389 Hillenbrand, C.-D. orcid:0000-0003-0240-7317 Kuhn, G.; Smith, J.A. orcid:0000-0002-1333-2544 Jacobs, S.; Anderson, J.B.; Jakobsson, M. 2013 Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica. The Cryosphere, 7 (1). 249-262. https://doi.org/10.5194/tc-7-249-2013 <https://doi.org/10.5194/tc-7-249-2013> |
op_doi |
https://doi.org/10.5194/tc-7-249-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
1 |
container_start_page |
249 |
op_container_end_page |
262 |
_version_ |
1766375919074672640 |