Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum

Type Article
Date 2014-09-15
Language English
Author(s) Mackintosh Andrew N.1, Verleyen Elie2, O'Brien Philip E.3, White Duanne A.4, Jones R. Selwyn1, McKay Robert1, Dunbar Robert5, Gore Damian B.3, Fink David6, Post Alexandra L.7, Miura Hideki8, Leventer Amy9, Goodwin Ian3, Hodgson Dominic A.10, Lilly Katherine11, Crosta Xavier12, Golledge Nicholas R.1, 13, Wagner Bernd14, Berg Sonja14, Van Ommen Tas15, 16, Zwartz Dan1, Roberts Stephen J.10, Vyverman Wim2, Masse Guillaume17
Affiliation(s) 1 : Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand.
2 : Univ Ghent, B-9000 Ghent, Belgium.
3 : Macquarie Univ, Dept Geog & Environm, N Ryde, NSW 2109, Australia.
4 : Univ Canberra, Inst Appl Ecol, Canberra, ACT 2601, Australia.
5 : Stanford Univ, Stanford, CA 94305 USA.
6 : ANSTO, Inst Environm Res, Menai, NSW 2234, Australia.
7 : Geosci Australia, Canberra, ACT 2601, Australia.
8 : Natl Inst Polar Res, Tachikawa, Tokyo 1908518, Japan.
9 : Colgate Univ, Dept Geol, Hamilton, NY 13346 USA.
10 : British Antarctic Survey, Nat Environm Res Council, Cambridge CB3 0ET, England.
11 : Univ Otago, Dept Geol, Dunedin, New Zealand.
12 : Univ Bordeaux 1, UMR 5805, F-33405 Talence, France.
13 : GNS Sci, Lower Hutt 5040, New Zealand.
14 : Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany.
15 : Australian Antarctic Div, Hobart, Tas 7001, Australia.
16 : Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas 7001, Australia.
17 : Univ Paris 06, LOCEAN, CNRS UPMC IRD MNHN UMR7159, F-75252 Paris, France.
Source Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2014-09-15 , Vol. 100 , P. 10-30
DOI 10.1016/j.quascirev.2013.07.024
WOS© Times Cited 111
Note Special issue Reconstruction of Antarctic Ice Sheet Deglaciation (RAISED)
Keyword(s) Antarctica, Last Glacial Maximum, Ice sheet, Sea level rise
Abstract 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 (similar to 30,000 years ago to present). This includes terrestrial cosmogenic nuclide dates from previously glaciated regions, C-14 chronologies from glacial and post-glacial deposits onshore and on the continental shelf, and ice sheet thickness changes inferred from ice cores and continental-scale ice sheet models. We also include new C-14 dates from the George V Land Terre Adelie 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 300-400 m 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 >1 km below sea level on the inner continental shelf. The Lambert/Amery system thickened by a greater amount (800 m) 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 similar to 100 m lower than present at this time. Ice sheet recession may have started similar to 18,000 years ago in the Lambert/Amery glacial system, and by similar to 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 la, destabilising the margins of the ice sheet. It is unlikely, however, that East Antarctica contributed more than similar to 1 m of eustatic sea-level equivalent to post-glacial meltwater pulses. The majority of ice sheet recession occurred after Meltwater Pulse la, between similar to 12,000 and similar to 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.
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Mackintosh Andrew N., Verleyen Elie, O'Brien Philip E., White Duanne A., Jones R. Selwyn, McKay Robert, Dunbar Robert, Gore Damian B., Fink David, Post Alexandra L., Miura Hideki, Leventer Amy, Goodwin Ian, Hodgson Dominic A., Lilly Katherine, Crosta Xavier, Golledge Nicholas R., Wagner Bernd, Berg Sonja, Van Ommen Tas, Zwartz Dan, Roberts Stephen J., Vyverman Wim, Masse Guillaume (2014). Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum. Quaternary Science Reviews, 100, 10-30. Publisher's official version : , Open Access version :