Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System
About 30% of ice draining the West Antarctic Ice Sheet discharges through several glacier systems into the Amundsen Sea Embayment (ASE) (Fig. 1a). Two major ice-stream outlets, Pine Island and Thwaites glaciers, have undergone significant twentieth century changes (e.g. Rignot et al. 2008) and much...
Published in: | Geological Society, London, Memoirs |
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Digital Commons @ University of South Florida
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/1562 https://doi.org/10.1144/M46.173 |
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-2548 2023-05-15T13:24:11+02:00 Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System Graham, A. G. C. Jakobsson, M. Nitsche, F. O. Larter, R. D. Anderson, J. B. Hillenbrand, C.-D. Gohl, K. Klages, J. P. Smith, J. A. Jenkins, A. 2016-01-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/1562 https://doi.org/10.1144/M46.173 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1562 https://doi.org/10.1144/M46.173 Marine Science Faculty Publications Life Sciences article 2016 ftunisfloridatam https://doi.org/10.1144/M46.173 2022-01-20T18:40:02Z About 30% of ice draining the West Antarctic Ice Sheet discharges through several glacier systems into the Amundsen Sea Embayment (ASE) (Fig. 1a). Two major ice-stream outlets, Pine Island and Thwaites glaciers, have undergone significant twentieth century changes (e.g. Rignot et al. 2008) and much effort has focused upon understanding their late Quaternary glacial history (Larter et al. 2014). At the Last Glacial Maximum (LGM), the ice sheet in the ASE expanded to reach the outer shelf and is postulated to have reached the shelf edge (Graham et al. 2010). The Pine Island and Thwaites glaciers combined regularly through Quaternary glaciations to carve out a >500 km long trough that extends from the shelf break back to the modern-day grounding line and beyond. Geophysical data exist for the breadth of this transect, including sub-ice-shelf bathymetry (Jenkins et al. 2010), making it one of the most complete palaeo-ice-stream landsystems known offshore of Antarctica. Deglaciation of the trough was underway by c. 20 cal. ka BP and was episodic, reaching a mid-shelf position by c. 13.5–12 cal. ka BP and retreating rapidly to the inner ASE by c. 11–9 cal. ka BP (Kirshner et al. 2012; Hillenbrand et al. 2013; Smith et al. 2014). Repeated pauses and several phases of ice-shelf break-up have been interpreted to have taken place during deglaciation based upon a well-preserved landform and sediment record (Lowe & Anderson 2002; Graham et al. 2010; Jakobsson et al. 2011). Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island Digital Commons University of South Florida (USF) Antarctic Amundsen Sea West Antarctic Ice Sheet Lowe ENVELOPE(-30.309,-30.309,-80.537,-80.537) Geological Society, London, Memoirs 46 1 493 500 |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Graham, A. G. C. Jakobsson, M. Nitsche, F. O. Larter, R. D. Anderson, J. B. Hillenbrand, C.-D. Gohl, K. Klages, J. P. Smith, J. A. Jenkins, A. Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
topic_facet |
Life Sciences |
description |
About 30% of ice draining the West Antarctic Ice Sheet discharges through several glacier systems into the Amundsen Sea Embayment (ASE) (Fig. 1a). Two major ice-stream outlets, Pine Island and Thwaites glaciers, have undergone significant twentieth century changes (e.g. Rignot et al. 2008) and much effort has focused upon understanding their late Quaternary glacial history (Larter et al. 2014). At the Last Glacial Maximum (LGM), the ice sheet in the ASE expanded to reach the outer shelf and is postulated to have reached the shelf edge (Graham et al. 2010). The Pine Island and Thwaites glaciers combined regularly through Quaternary glaciations to carve out a >500 km long trough that extends from the shelf break back to the modern-day grounding line and beyond. Geophysical data exist for the breadth of this transect, including sub-ice-shelf bathymetry (Jenkins et al. 2010), making it one of the most complete palaeo-ice-stream landsystems known offshore of Antarctica. Deglaciation of the trough was underway by c. 20 cal. ka BP and was episodic, reaching a mid-shelf position by c. 13.5–12 cal. ka BP and retreating rapidly to the inner ASE by c. 11–9 cal. ka BP (Kirshner et al. 2012; Hillenbrand et al. 2013; Smith et al. 2014). Repeated pauses and several phases of ice-shelf break-up have been interpreted to have taken place during deglaciation based upon a well-preserved landform and sediment record (Lowe & Anderson 2002; Graham et al. 2010; Jakobsson et al. 2011). |
format |
Article in Journal/Newspaper |
author |
Graham, A. G. C. Jakobsson, M. Nitsche, F. O. Larter, R. D. Anderson, J. B. Hillenbrand, C.-D. Gohl, K. Klages, J. P. Smith, J. A. Jenkins, A. |
author_facet |
Graham, A. G. C. Jakobsson, M. Nitsche, F. O. Larter, R. D. Anderson, J. B. Hillenbrand, C.-D. Gohl, K. Klages, J. P. Smith, J. A. Jenkins, A. |
author_sort |
Graham, A. G. C. |
title |
Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
title_short |
Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
title_full |
Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
title_fullStr |
Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
title_full_unstemmed |
Submarine Glacial-landform Distribution across the West Antarctic Margin, from Grounding Line to Slope: the Pine Island–Thwaites Ice-stream System |
title_sort |
submarine glacial-landform distribution across the west antarctic margin, from grounding line to slope: the pine island–thwaites ice-stream system |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2016 |
url |
https://digitalcommons.usf.edu/msc_facpub/1562 https://doi.org/10.1144/M46.173 |
long_lat |
ENVELOPE(-30.309,-30.309,-80.537,-80.537) |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet Lowe |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet Lowe |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1562 https://doi.org/10.1144/M46.173 |
op_doi |
https://doi.org/10.1144/M46.173 |
container_title |
Geological Society, London, Memoirs |
container_volume |
46 |
container_issue |
1 |
container_start_page |
493 |
op_container_end_page |
500 |
_version_ |
1766377912551866368 |