Testing models of ice cap extent, South Georgia, sub-Antarctic
The extent of Last Glacial Maximum ice in South Georgia is contested, with two alternative hypotheses: an extensive (maximum) model of ice reaching the edge of the continental shelf, or a restricted (minimum) model with ice constrained within the inner fjords. We present a new relative sea-level dat...
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2016
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Online Access: | https://researchprofiles.canberra.edu.au/en/publications/89cd37f5-5790-4d32-9601-8eb36c4ed2e3 https://doi.org/10.1016/j.quascirev.2016.11.007 http://www.scopus.com/inward/record.url?scp=84995777343&partnerID=8YFLogxK http://www.mendeley.com/research/testing-models-ice-cap-extent-south-georgia-subantarctic https://dro.dur.ac.uk/25022/1/25022.pdf#page=3 |
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ftcanberrauncris:oai:pure.atira.dk:publications/89cd37f5-5790-4d32-9601-8eb36c4ed2e3 2023-05-15T13:38:46+02:00 Testing models of ice cap extent, South Georgia, sub-Antarctic Barlow, Natasha Bentley, Michael Spada, Giorgio Evans, David Hansom, James Brader, Martin WHITE, Duanne Zander, Anja Berg, Sonja 2016 https://researchprofiles.canberra.edu.au/en/publications/89cd37f5-5790-4d32-9601-8eb36c4ed2e3 https://doi.org/10.1016/j.quascirev.2016.11.007 http://www.scopus.com/inward/record.url?scp=84995777343&partnerID=8YFLogxK http://www.mendeley.com/research/testing-models-ice-cap-extent-south-georgia-subantarctic https://dro.dur.ac.uk/25022/1/25022.pdf#page=3 eng eng info:eu-repo/semantics/openAccess Barlow , N , Bentley , M , Spada , G , Evans , D , Hansom , J , Brader , M , WHITE , D , Zander , A & Berg , S 2016 , ' Testing models of ice cap extent, South Georgia, sub-Antarctic ' , Quaternary Science Reviews , vol. 154 , pp. 157-168 . https://doi.org/10.1016/j.quascirev.2016.11.007 article 2016 ftcanberrauncris https://doi.org/10.1016/j.quascirev.2016.11.007 2022-10-31T06:45:21Z The extent of Last Glacial Maximum ice in South Georgia is contested, with two alternative hypotheses: an extensive (maximum) model of ice reaching the edge of the continental shelf, or a restricted (minimum) model with ice constrained within the inner fjords. We present a new relative sea-level dataset for South Georgia, summarising published and new geomorphological evidence for the marine limit and elevations of former sea levels on the island. Using a glacial isostatic adjustment model (ALMA) specifically suited to regional modelling and working at high spatial resolutions, combined with a series of simulated ice-load histories, we use the relative sea-level data to test between the restricted and extensive ice extent scenarios. The model results suggest that there was most likely an extensive Last Glacial Maximum glaciation of South Georgia, implying that the island was covered by thick (>1000 m) ice, probably to the edge of the continental shelf, with deglaciation occurring relatively early (ca. 15 ka BP, though independent data suggest this may have been as early as 18 ka). The presence of an extensive ice cap extending to the shelf edge would imply that if there were any biological refugia around South Georgia, they must have been relatively localised and restricted to the outermost shelf. Article in Journal/Newspaper Antarc* Antarctic Ice cap University of Canberra Research Portal Antarctic Quaternary Science Reviews 154 157 168 |
institution |
Open Polar |
collection |
University of Canberra Research Portal |
op_collection_id |
ftcanberrauncris |
language |
English |
description |
The extent of Last Glacial Maximum ice in South Georgia is contested, with two alternative hypotheses: an extensive (maximum) model of ice reaching the edge of the continental shelf, or a restricted (minimum) model with ice constrained within the inner fjords. We present a new relative sea-level dataset for South Georgia, summarising published and new geomorphological evidence for the marine limit and elevations of former sea levels on the island. Using a glacial isostatic adjustment model (ALMA) specifically suited to regional modelling and working at high spatial resolutions, combined with a series of simulated ice-load histories, we use the relative sea-level data to test between the restricted and extensive ice extent scenarios. The model results suggest that there was most likely an extensive Last Glacial Maximum glaciation of South Georgia, implying that the island was covered by thick (>1000 m) ice, probably to the edge of the continental shelf, with deglaciation occurring relatively early (ca. 15 ka BP, though independent data suggest this may have been as early as 18 ka). The presence of an extensive ice cap extending to the shelf edge would imply that if there were any biological refugia around South Georgia, they must have been relatively localised and restricted to the outermost shelf. |
format |
Article in Journal/Newspaper |
author |
Barlow, Natasha Bentley, Michael Spada, Giorgio Evans, David Hansom, James Brader, Martin WHITE, Duanne Zander, Anja Berg, Sonja |
spellingShingle |
Barlow, Natasha Bentley, Michael Spada, Giorgio Evans, David Hansom, James Brader, Martin WHITE, Duanne Zander, Anja Berg, Sonja Testing models of ice cap extent, South Georgia, sub-Antarctic |
author_facet |
Barlow, Natasha Bentley, Michael Spada, Giorgio Evans, David Hansom, James Brader, Martin WHITE, Duanne Zander, Anja Berg, Sonja |
author_sort |
Barlow, Natasha |
title |
Testing models of ice cap extent, South Georgia, sub-Antarctic |
title_short |
Testing models of ice cap extent, South Georgia, sub-Antarctic |
title_full |
Testing models of ice cap extent, South Georgia, sub-Antarctic |
title_fullStr |
Testing models of ice cap extent, South Georgia, sub-Antarctic |
title_full_unstemmed |
Testing models of ice cap extent, South Georgia, sub-Antarctic |
title_sort |
testing models of ice cap extent, south georgia, sub-antarctic |
publishDate |
2016 |
url |
https://researchprofiles.canberra.edu.au/en/publications/89cd37f5-5790-4d32-9601-8eb36c4ed2e3 https://doi.org/10.1016/j.quascirev.2016.11.007 http://www.scopus.com/inward/record.url?scp=84995777343&partnerID=8YFLogxK http://www.mendeley.com/research/testing-models-ice-cap-extent-south-georgia-subantarctic https://dro.dur.ac.uk/25022/1/25022.pdf#page=3 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice cap |
genre_facet |
Antarc* Antarctic Ice cap |
op_source |
Barlow , N , Bentley , M , Spada , G , Evans , D , Hansom , J , Brader , M , WHITE , D , Zander , A & Berg , S 2016 , ' Testing models of ice cap extent, South Georgia, sub-Antarctic ' , Quaternary Science Reviews , vol. 154 , pp. 157-168 . https://doi.org/10.1016/j.quascirev.2016.11.007 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.11.007 |
container_title |
Quaternary Science Reviews |
container_volume |
154 |
container_start_page |
157 |
op_container_end_page |
168 |
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1766110962503385088 |