Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence
The Last Glacial Maximum (LGM; ca 23–19 ka BP) extent of grounded ice in the Filchner Trough, a major cross shelf trough extending seaward from the Filchner Ice Shelf in the southern Weddell Sea, has been much debated. Here we present data from the first extensive multibeam swath bathymetry and sub-...
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-2566 2023-05-15T14:04:11+02:00 Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence Larter, Robert D. Graham, Alastair G. C. Hillenbrand, Claus-Dieter Smith, James A. Gales, Jennifer A. 2012-01-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/1544 https://doi.org/10.1016/j.quascirev.2012.08.006 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1544 https://doi.org/10.1016/j.quascirev.2012.08.006 Marine Science Faculty Publications Antarctic Ice sheet Last Glacial Maximum Bathymetry Acoustic profile Geomorphology Bedform Lineation Furrow Grounding zone wedge Life Sciences article 2012 ftunisfloridatam https://doi.org/10.1016/j.quascirev.2012.08.006 2022-01-20T18:40:25Z The Last Glacial Maximum (LGM; ca 23–19 ka BP) extent of grounded ice in the Filchner Trough, a major cross shelf trough extending seaward from the Filchner Ice Shelf in the southern Weddell Sea, has been much debated. Here we present data from the first extensive multibeam swath bathymetry and sub-bottom acoustic profiling surveys in the Filchner Trough that include several parallel survey lines with overlapping swaths. We interpret these new data, combined with published observations and radiocarbon dates from sediment cores, as indicating that the grounding line in the Filchner Trough during the LGM advanced beyond the middle shelf, probably to within 40 km of the shelf break, and possibly reached the shelf break. Three different hypotheses are discussed that could reconcile this interpretation with interpretations, based on ice coring and surface exposure age data, that LGM ice surface elevations in areas draining into the Filchner and Ronne ice shelves were no more than a few hundred metres higher than today: (1) ice plain conditions extended along most of the Filchner Trough; (2) the ice shelf advanced and thickened so that it “touched down” on the continental shelf for a short period; (3) LGM ice drainage pathways in the interior of the Weddell Sea embayment were different from those observed today. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Weddell Sea Digital Commons University of South Florida (USF) Antarctic Weddell Sea Weddell Filchner Trough ENVELOPE(-36.000,-36.000,-77.000,-77.000) Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) Quaternary Science Reviews 53 111 122 |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Antarctic Ice sheet Last Glacial Maximum Bathymetry Acoustic profile Geomorphology Bedform Lineation Furrow Grounding zone wedge Life Sciences |
spellingShingle |
Antarctic Ice sheet Last Glacial Maximum Bathymetry Acoustic profile Geomorphology Bedform Lineation Furrow Grounding zone wedge Life Sciences Larter, Robert D. Graham, Alastair G. C. Hillenbrand, Claus-Dieter Smith, James A. Gales, Jennifer A. Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
topic_facet |
Antarctic Ice sheet Last Glacial Maximum Bathymetry Acoustic profile Geomorphology Bedform Lineation Furrow Grounding zone wedge Life Sciences |
description |
The Last Glacial Maximum (LGM; ca 23–19 ka BP) extent of grounded ice in the Filchner Trough, a major cross shelf trough extending seaward from the Filchner Ice Shelf in the southern Weddell Sea, has been much debated. Here we present data from the first extensive multibeam swath bathymetry and sub-bottom acoustic profiling surveys in the Filchner Trough that include several parallel survey lines with overlapping swaths. We interpret these new data, combined with published observations and radiocarbon dates from sediment cores, as indicating that the grounding line in the Filchner Trough during the LGM advanced beyond the middle shelf, probably to within 40 km of the shelf break, and possibly reached the shelf break. Three different hypotheses are discussed that could reconcile this interpretation with interpretations, based on ice coring and surface exposure age data, that LGM ice surface elevations in areas draining into the Filchner and Ronne ice shelves were no more than a few hundred metres higher than today: (1) ice plain conditions extended along most of the Filchner Trough; (2) the ice shelf advanced and thickened so that it “touched down” on the continental shelf for a short period; (3) LGM ice drainage pathways in the interior of the Weddell Sea embayment were different from those observed today. |
format |
Article in Journal/Newspaper |
author |
Larter, Robert D. Graham, Alastair G. C. Hillenbrand, Claus-Dieter Smith, James A. Gales, Jennifer A. |
author_facet |
Larter, Robert D. Graham, Alastair G. C. Hillenbrand, Claus-Dieter Smith, James A. Gales, Jennifer A. |
author_sort |
Larter, Robert D. |
title |
Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
title_short |
Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
title_full |
Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
title_fullStr |
Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
title_full_unstemmed |
Late Quaternary Grounded Ice Extent in the Filchner Trough, Weddell Sea, Antarctica: New Marine Geophysical Evidence |
title_sort |
late quaternary grounded ice extent in the filchner trough, weddell sea, antarctica: new marine geophysical evidence |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2012 |
url |
https://digitalcommons.usf.edu/msc_facpub/1544 https://doi.org/10.1016/j.quascirev.2012.08.006 |
long_lat |
ENVELOPE(-36.000,-36.000,-77.000,-77.000) ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
geographic |
Antarctic Weddell Sea Weddell Filchner Trough Filchner Ice Shelf |
geographic_facet |
Antarctic Weddell Sea Weddell Filchner Trough Filchner Ice Shelf |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Weddell Sea |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1544 https://doi.org/10.1016/j.quascirev.2012.08.006 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.08.006 |
container_title |
Quaternary Science Reviews |
container_volume |
53 |
container_start_page |
111 |
op_container_end_page |
122 |
_version_ |
1766275210469703680 |