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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/1095

Title: Exposure ages from mountain dipsticks in Mac. Robertson Land, East Antarctica, indicate little change in ice-sheet thickness since the Last Glacial Maximum.
Authors: Mackintosh, A
White, DA
Fink, D
Gore, DB
Pickard, J
Fanning, PC
Keywords: Antarctica
Mountains
Ice
Climatic Change
Glaciers
Sea Level
Issue Date: Jun-2007
Publisher: Geological Society of America
Citation: Mackintosh, A., White, D. A., Fink, D., Gore, D. B., Pickard, J., & Fanning, P. C. (2007). Exposure ages from mountain dipsticks in Mac. Robertson Land, East Antarctica, indicate little change in ice-sheet thickness since the Last Glacial Maximum. Geology, 35(6), 551-554.
Abstract: 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 Be-10 and Al-26 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 similar to 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 EAIS volume changes are controlled by growth and decay of Northern Hemisphere ice sheets and associated global sea-level changes. © 2007, Geological Society of America
URI: http://dx.doi.org/10.1130/G23503A.1
http://apo.ansto.gov.au/dspace/handle/10238/1095
ISSN: 0091-7613
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