Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum
The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica's continental ice volume. Over the last few decades, studies on glacial-geological records in this sector have provided conflicting reconstructions of changes in...
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Pergamon-Elsevier Science Ltd
2013
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Online Access: | http://hdl.handle.net/1959.4/unsworks_37179 https://doi.org/10.1016/j.quascirev.2013.07.020 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_37179 2024-06-02T07:55:26+00:00 Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum Fogwill, CJ Graham, Antony 2013 http://hdl.handle.net/1959.4/unsworks_37179 https://doi.org/10.1016/j.quascirev.2013.07.020 unknown Pergamon-Elsevier Science Ltd http://purl.org/au-research/grants/arc/LP120200724 http://purl.org/au-research/grants/arc/FT120100004 http://hdl.handle.net/1959.4/unsworks_37179 https://doi.org/10.1016/j.quascirev.2013.07.020 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:0277-3791 Quaternary Science Reviews, 100, 111-136 anzsrc-for: 04 Earth Sciences anzsrc-for: 21 History and Archaeology journal article http://purl.org/coar/resource_type/c_6501 2013 ftunswworks https://doi.org/10.1016/j.quascirev.2013.07.020 2024-05-07T23:55:04Z The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica's continental ice volume. Over the last few decades, studies on glacial-geological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23-19 calibrated kiloyears before present, calkaBP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on the Weddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different ice-sheet models have reconstructed conflicting LGM ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the LGM sea-level low-stand of ~130m vary considerably. In this paper, we summarise and review the geological records of past ice-sheet margins and past ice-sheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the LGM ice-sheet configuration, including time-slice reconstructions for post-LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Weddell Sea UNSW Sydney (The University of New South Wales): UNSWorks Antarctic The Antarctic Weddell Weddell Sea Quaternary Science Reviews 100 111 136 |
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Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
anzsrc-for: 04 Earth Sciences anzsrc-for: 21 History and Archaeology |
spellingShingle |
anzsrc-for: 04 Earth Sciences anzsrc-for: 21 History and Archaeology Fogwill, CJ Graham, Antony Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
topic_facet |
anzsrc-for: 04 Earth Sciences anzsrc-for: 21 History and Archaeology |
description |
The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica's continental ice volume. Over the last few decades, studies on glacial-geological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23-19 calibrated kiloyears before present, calkaBP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on the Weddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different ice-sheet models have reconstructed conflicting LGM ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the LGM sea-level low-stand of ~130m vary considerably. In this paper, we summarise and review the geological records of past ice-sheet margins and past ice-sheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the LGM ice-sheet configuration, including time-slice reconstructions for post-LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative ... |
format |
Article in Journal/Newspaper |
author |
Fogwill, CJ Graham, Antony |
author_facet |
Fogwill, CJ Graham, Antony |
author_sort |
Fogwill, CJ |
title |
Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
title_short |
Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
title_full |
Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
title_fullStr |
Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
title_full_unstemmed |
Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum |
title_sort |
reconstruction of changes in the weddell sea sector of the antarctic ice sheet since the last glacial maximum |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2013 |
url |
http://hdl.handle.net/1959.4/unsworks_37179 https://doi.org/10.1016/j.quascirev.2013.07.020 |
geographic |
Antarctic The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Sheet Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Weddell Sea |
op_source |
urn:ISSN:0277-3791 Quaternary Science Reviews, 100, 111-136 |
op_relation |
http://purl.org/au-research/grants/arc/LP120200724 http://purl.org/au-research/grants/arc/FT120100004 http://hdl.handle.net/1959.4/unsworks_37179 https://doi.org/10.1016/j.quascirev.2013.07.020 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.07.020 |
container_title |
Quaternary Science Reviews |
container_volume |
100 |
container_start_page |
111 |
op_container_end_page |
136 |
_version_ |
1800748731246575616 |