globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2013.07.024
Scopus记录号: 2-s2.0-84903763295
论文题名:
Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum
作者: Mackintosh A.N.; Verleyen E.; O'Brien P.E.; White D.A.; Jones R.S.; McKay R.; Dunbar R.; Gore D.B.; Fink D.; Post A.L.; Miura H.; Leventer A.; Goodwin I.; Hodgson D.A.; Lilly K.; Crosta X.; Golledge N.R.; Wagner B.; Berg S.; van Ommen T.; Zwartz D.; Roberts S.J.; Vyverman W.; Masse G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 100
起始页码: 10
结束页码: 30
语种: 英语
英文关键词: Antarctica ; Ice sheet ; Last Glacial Maximum ; Sea level rise
Scopus关键词: Glacial geology ; Glaciers ; Sea level ; Antarctica ; Continental shelves ; East antarctic ice sheets ; Ice sheet ; Last Glacial Maximum ; Meltwater pulse 1a ; Sea level rise ; Terrestrial cosmogenic nuclides ; Ice ; continental shelf ; cosmogenic radionuclide ; geochronology ; geological record ; glacial deposit ; grounding line ; ice retreat ; ice sheet ; ice stream ; Last Glacial Maximum ; meltwater ; nunatak ; sea level change ; Adelie Coast ; Antarctic Ice Sheet ; Antarctica ; Bunger Hills ; East Antarctic Ice Sheet ; East Antarctica ; George V Coast ; Larsemann Hills
英文摘要: The East Antarctic Ice Sheet (EAIS) is the largest continental ice mass on Earth, and documenting its evolution since the Last Glacial Maximum (LGM) is important for understanding its present-day and future behaviour. As part of a community effort, we review geological evidence from East Antarctica that constrains the ice sheet history throughout this period (~30,000 years ago to present). This includes terrestrial cosmogenic nuclide dates from previously glaciated regions, 14C chronologies from glacial and post-glacial deposits onshore and on the continental shelf, and ice sheet thickness changes inferred fromice cores and continental-scale ice sheet models. We also include new 14C dates from the George V Land- Terre Adélie Coast shelf. We show that the EAIS advanced to the continental shelf margin in some parts of East Antarctica, and that the ice sheet characteristically thickened by 300-400m near the present-day coastline at these sites. This advance was associated with the formation of low-gradient ice streams that grounded at depths of >1km below sea level on the inner continental shelf. The Lambert/Amery system thickened by a greater amount (800m) near its present-day grounding zone, but did not advance beyond the inner continental shelf. At other sites in coastal East Antarctica (e.g. Bunger Hills, Larsemann Hills), very little change in the ice sheet margin occurred at the LGM, perhaps because ice streams accommodated any excess ice build up, leaving adjacent, ice-free areas relatively unaffected. Evidence from nunataks indicates that the amount of ice sheet thickening diminished inland at the LGM, an observation supported by ice cores, which suggest that interior ice sheet domes were ~100m lower than present at this time. Ice sheet recession may have started ~18,000 years ago in the Lambert/Amery glacial system, and by ~14,000 years ago in Mac.Robertson Land. These early pulses of deglaciation may have been responses to abrupt sea-level rise events such as Meltwater Pulse 1a, destabilising the margins of the ice sheet. It is unlikely, however, that East Antarctica contributed more than ~1m of eustatic sea-level equivalent to post-glacial meltwater pulses. The majority of ice sheet recession occurred after Meltwater Pulse 1a, between ~12,000 and ~6000 years ago, during a period when the adjacent ocean warmed significantly. Large tracts of East Antarctica remain poorly studied, and further work is required to develop a robust understanding of the LGM ice sheet expansion, and its subsequent contraction. Further work will also allow the contribution of the EAIS to post-glacial sea-level rise, and present-day estimates of glacio-isostatic adjustment to be refined. © 2014 The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60176
Appears in Collections:过去全球变化的重建

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作者单位: Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington, New Zealand; Ghent University, Protistology and Aquatic Ecology, Krijgslaan 281 S8, 9000 Gent, Belgium; Department of Environment and Geography, Macquarie University, NSW 2109, Australia; Institute for Applied Ecology, University of Canberra, ACT 2601, Australia; Environmental Earth System Science, Stanford University, Stanford, CA 94305, United States; Institute for Environmental Research, ANSTO, Menai, NSW 2234, Australia; Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia; National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan; Department of Geology, Colgate University, Hamilton, NY 13346, United States; British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand; Environnement et Paléoenvironnement Océaniques et Continentaux UMR 5805, Université Bordeaux 1, Avenue des Facultés, 33405 Talence Cedex, France; GNS Science, PO Box 30-368, Lower Hutt 5040, New Zealand; Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Strasse 49a, 50674 Cologne, Germany; Australian Antarctic Division and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart 7001, Tasmania, Australia; LOCEAN, UMR7159 CNRS/UPMC/IRD/MNHN, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France

Recommended Citation:
Mackintosh A.N.,Verleyen E.,O'Brien P.E.,et al. Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum[J]. Quaternary Science Reviews,2014-01-01,100
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