Universität zu Köln

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

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Barlow, N. L. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bentley, M. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spada, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Evans, D. J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hansom, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brader, M. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED White, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zander, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berg, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252513
DOI:	10.1016/j.quascirev.2016.11.007
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	154
Page Range:	S. 157 - 169
Date:	2016
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GLACIAL HISTORY; ENVIRONMENTAL-CHANGE; SEA; DEGLACIATION; GEOMORPHOLOGY; FLUCTUATIONS; SPITSBERGEN; PROGRAM; MAXIMUM Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25251