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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ftunibolognairis:oai:cris.unibo.it:11585/771739 2024-09-15T17:44:44+00:00 Testing models of ice cap extent, South Georgia, sub-Antarctic Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. 2016 STAMPA http://hdl.handle.net/11585/771739 https://doi.org/10.1016/j.quascirev.2016.11.007 http://www.sciencedirect.com/science/article/pii/S027737911630511X eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000390505700008 volume:154 issue:154 firstpage:157 lastpage:168 numberofpages:12 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11585/771739 doi:10.1016/j.quascirev.2016.11.007 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84995777343 http://www.sciencedirect.com/science/article/pii/S027737911630511X Last Glacial Maximum Glacial isostatic adjustment Sea-level change South Georgia sub-Antarctic Coastal geomorphology info:eu-repo/semantics/article 2016 ftunibolognairis https://doi.org/10.1016/j.quascirev.2016.11.007 2024-07-08T14:06:47Z 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. © 2016 Elsevier Ltd Article in Journal/Newspaper Antarc* Antarctic Ice cap IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Quaternary Science Reviews 154 157 168 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Last Glacial Maximum Glacial isostatic adjustment Sea-level change South Georgia sub-Antarctic Coastal geomorphology |
spellingShingle |
Last Glacial Maximum Glacial isostatic adjustment Sea-level change South Georgia sub-Antarctic Coastal geomorphology Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. Testing models of ice cap extent, South Georgia, sub-Antarctic |
topic_facet |
Last Glacial Maximum Glacial isostatic adjustment Sea-level change South Georgia sub-Antarctic Coastal geomorphology |
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. © 2016 Elsevier Ltd |
author2 |
Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. |
format |
Article in Journal/Newspaper |
author |
Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. |
author_facet |
Barlow, N. L. M. Bentley, M. J. SPADA, GIORGIO Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. |
author_sort |
Barlow, N. L. M. |
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 |
http://hdl.handle.net/11585/771739 https://doi.org/10.1016/j.quascirev.2016.11.007 http://www.sciencedirect.com/science/article/pii/S027737911630511X |
genre |
Antarc* Antarctic Ice cap |
genre_facet |
Antarc* Antarctic Ice cap |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000390505700008 volume:154 issue:154 firstpage:157 lastpage:168 numberofpages:12 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11585/771739 doi:10.1016/j.quascirev.2016.11.007 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84995777343 http://www.sciencedirect.com/science/article/pii/S027737911630511X |
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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1810492394741694464 |