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

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dc.contributor.authorMackintosh, ANen_AU
dc.contributor.authorWhite, DAen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorGore, DBen_AU
dc.contributor.authorPickard, Jen_AU
dc.contributor.authorFanning, PCen_AU
dc.date.accessioned2008-04-22T04:47:47Zen_AU
dc.date.accessioned2010-04-30T05:03:28Zen_AU
dc.date.available2008-04-22T04:47:47Zen_AU
dc.date.available2010-04-30T05:03:28Zen_AU
dc.date.issued2007-06en_AU
dc.date.statistics2007-06en_AU
dc.description.abstractPast 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 Americaen_AU
dc.identifier.citationMackintosh, 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. doi:10.1130/G23503A.1en_AU
dc.identifier.govdoc1225en_AU
dc.identifier.issn0091-7613en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleGeologyen_AU
dc.identifier.pagination551-554en_AU
dc.identifier.urihttp://dx.doi.org/10.1130/G23503A.1en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1095en_AU
dc.identifier.volume35en_AU
dc.language.isoenen_AU
dc.publisherGeological Society of Americaen_AU
dc.subjectAntarcticaen_AU
dc.subjectMountainsen_AU
dc.subjectIceen_AU
dc.subjectClimatic changeen_AU
dc.subjectGlaciersen_AU
dc.subjectSea levelen_AU
dc.titleExposure ages from mountain dipsticks in Mac. Robertson Land, East Antarctica, indicate little change in ice-sheet thickness since the Last Glacial Maximumen_AU
dc.typeJournal Articleen_AU
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