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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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:25251 2023-05-15T13:57:43+02:00 Testing models of ice cap extent, South Georgia, sub-Antarctic Barlow, N. L. M. Bentley, M. J. Spada, G. Evans, D. J. A. Hansom, J. D. Brader, M. D. White, D. A. Zander, A. Berg, S. 2016 https://kups.ub.uni-koeln.de/25251/ eng eng PERGAMON-ELSEVIER SCIENCE LTD Barlow, N. L. M., Bentley, M. J., Spada, G., Evans, D. J. A., Hansom, J. D., Brader, M. D., White, D. A., Zander, A. and Berg, S. (2016). Testing models of ice cap extent, South Georgia, sub-Antarctic. Quat. Sci. Rev., 154. S. 157 - 169. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791 ddc:no doc-type:article publishedVersion 2016 ftubkoeln 2022-11-09T07:20:06Z 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. (C) 2016 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Ice cap Cologne University: KUPS Antarctic |
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Cologne University: KUPS |
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language |
English |
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ddc:no Barlow, N. L. M. Bentley, M. J. Spada, G. 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 |
ddc:no |
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. (C) 2016 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Barlow, N. L. M. Bentley, M. J. Spada, G. 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, G. 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 |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2016 |
url |
https://kups.ub.uni-koeln.de/25251/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice cap |
genre_facet |
Antarc* Antarctic Ice cap |
op_relation |
Barlow, N. L. M., Bentley, M. J., Spada, G., Evans, D. J. A., Hansom, J. D., Brader, M. D., White, D. A., Zander, A. and Berg, S. (2016). Testing models of ice cap extent, South Georgia, sub-Antarctic. Quat. Sci. Rev., 154. S. 157 - 169. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791 |
_version_ |
1766265531958034432 |