DOI: 10.1016/j.quascirev.2016.11.007
Scopus记录号: 2-s2.0-84995777343
论文题名: Testing models of ice cap extent, South Georgia, sub-Antarctic
作者: 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.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 154 起始页码: 157
结束页码: 168
语种: 英语
英文关键词: Coastal geomorphology
; Glacial isostatic adjustment
; Last Glacial Maximum
; Sea-level change
; South Georgia
; sub-Antarctic
Scopus关键词: Glacial geology
; Sea level
; Snow
; Glacial Isostatic Adjustments
; Last Glacial Maximum
; Sealevel change
; South Georgia
; sub-Antarctic
; Ice
; coastal morphology
; continental shelf
; deglaciation
; fjord
; glaciation
; glacioisostasy
; ice cap
; Last Glacial Maximum
; sea level change
; shelf break
; spatial resolution
; testing method
; Antarctica
; South Georgia
英文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59378
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Durham University, South Road, Durham, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Dipartimento di Scienze Pure e Applicate (DiSPeA), Urbino University “Carlo Bo”, Urbino, Italy; School of Geographical and Earth Sciences, University of Glasgow, Glasgow, United Kingdom; Institute for Applied Ecology, University of Canberra, Canberra, ACT, Australia; Institute of Geography, University of Cologne, Albertus-Magnus-Platz, Cologne, Germany; Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, Cologne, Germany
Recommended Citation:
Barlow N.L.M.,Bentley M.J.,Spada G.,et al. Testing models of ice cap extent, South Georgia, sub-Antarctic[J]. Quaternary Science Reviews,2016-01-01,154