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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ftnerc:oai:nora.nerc.ac.uk:17873 2023-05-15T13:45:12+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 http://nora.nerc.ac.uk/id/eprint/17873/ http://adsabs.harvard.edu/abs/2012QSRv.53.111L unknown Elsevier Larter, Robert D. orcid:0000-0002-8414-7389 Graham, Alastair G.C.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Smith, James A. orcid:0000-0002-1333-2544 Gales, Jennifer A. 2012 Late Quaternary grounded ice extent in the Filchner Trough, Weddell Sea, Antarctica: new marine geophysical evidence. Quaternary Science Reviews, 53. 111-122. https://doi.org/10.1016/j.quascirev.2012.08.006 <https://doi.org/10.1016/j.quascirev.2012.08.006> Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.1016/j.quascirev.2012.08.006 2023-02-04T19:31:21Z 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* Antarctica Ice Shelf Ice Shelves Weddell Sea Natural Environment Research Council: NERC Open Research Archive 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 |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
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. |
spellingShingle |
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 |
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 |
Elsevier |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/17873/ http://adsabs.harvard.edu/abs/2012QSRv.53.111L |
long_lat |
ENVELOPE(-36.000,-36.000,-77.000,-77.000) ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
geographic |
Weddell Sea Weddell Filchner Trough Filchner Ice Shelf |
geographic_facet |
Weddell Sea Weddell Filchner Trough Filchner Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves Weddell Sea |
op_relation |
Larter, Robert D. orcid:0000-0002-8414-7389 Graham, Alastair G.C.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Smith, James A. orcid:0000-0002-1333-2544 Gales, Jennifer A. 2012 Late Quaternary grounded ice extent in the Filchner Trough, Weddell Sea, Antarctica: new marine geophysical evidence. Quaternary Science Reviews, 53. 111-122. https://doi.org/10.1016/j.quascirev.2012.08.006 <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_ |
1766216457486598144 |