DOI: 10.1016/j.quascirev.2013.07.020
Scopus记录号: 2-s2.0-84907596739
论文题名: Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum
作者: Hillenbrand C.-D. ; Bentley M.J. ; Stolldorf T.D. ; Hein A.S. ; Kuhn G. ; Graham A.G.C. ; Fogwill C.J. ; Kristoffersen Y. ; Smith J.A. ; Anderson J.B. ; Larter R.D. ; Melles M. ; Hodgson D.A. ; Mulvaney R. ; Sugden D.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 100 起始页码: 111
结束页码: 136
语种: 英语
英文关键词: Antarctica
; Cosmogenic nuclide surface exposure age dating
; Deglaciation
; Geomorphology
; Glacial history
; Ice sheet
; Ice Shelf
; Last Glacial Maximum
; Radiocarbon dating
; Sea level
; Weddell Sea
Scopus关键词: Geochronology
; Geomorphology
; Glacial geology
; Glaciers
; Repair
; Sea level
; Sediments
; Submarine geology
; Antarctica
; Deglaciations
; Glacial history
; Ice sheet
; Ice shelves
; Last Glacial Maximum
; Radiocarbon dating
; Surface exposure age
; Weddell Sea
; Ice
; Antarctic Bottom Water
; geochronology
; geomorphology
; glacial history
; grounding line
; ice sheet
; ice shelf
; Last Glacial Maximum
; paleoceanography
; radiocarbon dating
; reconstruction
; sea level
; subglacial deposit
; Antarctic Ice Sheet
; Antarctica
; Southern Ocean
; Weddell Sea
英文摘要: The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica's continental ice volume. Over the last few decades, studies on glacial-geological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23-19 calibrated kiloyears before present, calkaBP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on the Weddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different ice-sheet models have reconstructed conflicting LGM ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the LGM sea-level low-stand of ~130m vary considerably. In this paper, we summarise and review the geological records of past ice-sheet margins and past ice-sheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the LGM ice-sheet configuration, including time-slice reconstructions for post-LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative interpretations of glacial-geological datasets on Antarctic Ice-Sheet History for the Weddell Sea sector, which can be utilised to test and improve numerical ice-sheet models. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60178
Appears in Collections: 过去全球变化的重建
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作者单位: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Department of Geography, Durham University, South Road, Durham DH1 3LE, United Kingdom; Department of Earth Sciences, Rice University, 6100 Main Street, Houston, TX 77005, United States; School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, United Kingdom; Alfred-Wegener-Institut Hemholtz-Zentrum für Polar- und Meeresforschung, Am Alten Hafen 26, D-27568 Bremerhaven, Germany; College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, United Kingdom; Climate Change Research Centre, University of New South Wales, Sydney, Australia; Department of Earth Science, University of Bergen, Allegate 41, Bergen N-5014, Norway; Institute of Geology and Mineralogy, University of Cologne, Zülpicher Strasse 49a, D-50674 Cologne, Germany
Recommended Citation:
Hillenbrand C.-D.,Bentley M.J.,Stolldorf T.D.,et al. Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum[J]. Quaternary Science Reviews,2014-01-01,100