Exposure ages from mountain dipsticsk in Mac. Robertson Land, East Antarctica, indicate little change in ice-sheet thickness since the Last Glacial Maximum

Andrew Mackintosh, Duanne White, David Fink, Damian B. Gore, John Pickard, Patricia C. Fanning

Research output: Contribution to journalArticleResearchpeer-review

89 Citations (Scopus)


Past changes in East Antarctic Ice Sheet (EAIS) volume are poorly known and difficult to measure, yet are critical for predicting the response of the ice sheet to modern climate change. In particular, it is important to identify the sources of sea-level rise since the Last Glacial Maximum (LGM), and ascertain the present-day stability of the world's largest ice sheet. We present altitudinal transects of 10Be and 26Al exposure ages across the Framnes Mountains in Mac. Robertson Land that allow the magnitude and timing of EAIS retreat to be quantified. Our data show that the coastal EAIS thinned by at most 350 m in this region during the past 13 k.y. This reduction in ice-sheet volume occurred over a -5 k.y. period, and the present ice-sheet profile was attained ca. 7 ka, in contrast to the West Antarctic Ice Sheet, which continues to retreat today. Combined with regional offshore and terrestrial geologic evidence, our data suggest that the reduction in EAIS volume since the LGM was smaller than that indicated by contemporary ice-sheet models and added little meltwater to the global oceans. Stability of the ice margin since the middle Holocene provides support for the hypothesis that EALS volume changes are controlled by growth and decay of Northern Hemisphere ice sheets and associated global sea-level changes.

Original languageEnglish
Pages (from-to)551-554
Number of pages4
Issue number6
Publication statusPublished - 1 Jun 2007
Externally publishedYes


  • East Antarctic Ice Sheet
  • Exposure dating
  • Ice-sheet model
  • Last Glacial Maximum
  • Meltwater Pulse 1A
  • Sea level

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