Testing the sensitivity of the East Antarctic Ice Sheet to S
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TitleTesting the sensitivity of the East Antarctic Ice Sheet to Southern Ocean dynamics: Past changes and future implicationsAbstractThe stability of Antarctic ice sheets and their potential contribution to sea level under projected future warming remains highly uncertain. The Last Interglacial (135 000-116 000 years ago) provides a potential analogue, with global temperatures 2Â^circC higher and rates of sea-level rise >5.6m ka-1, leading to sea levels 6.6-9.4m higher than present. The source(s) of this sea-level rise remain fiercely debated. Here we report a series of independent model simulations exploring the effects of migrating Southern Hemisphere Westerlies (SHWs) on Southern Ocean circulation and Antarctic ice-sheet dynamics. We suggest that southerly shifts in winds may have significantly impacted the sub-polar gyres, inducing pervasive warming (0.2-0.8Â^circC in the upper 1200m) adjacent to sectors of the East Antarctic Ice Sheet (EAIS), which due to their geometries and connectivity to the Southern Ocean are highly sensitive to ocean forcing. We conclude that the EAIS potentially made a substantial, hitherto unsuspected, contribution to interglacial sea levels, and given 21st-century projections in the Southern Annular Mode and associated SHW migration, we highlight how pervasive circum-Antarctic warming may threaten EAIS stability. ÂCopyright 2013 John Wiley & Sons, Ltd.AcknowledgementsThis work was supported by the Australian Research Council (FT120100004, FL100100195 and FT100100443), and by the Australian Governmentś Cooperative Research Centres Programme through the Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC). K.J.M. is grateful for an award under the Merit Allocation Scheme on the NCI National Facility at the ANU. N.R.G. acknowledges financial support from VUW Foundation grant ARCCIM, GNS Science, and the ANDRILL project. We thank R. Gerdes, R. Warner and T. Naish for their helpful comments on an earlier version of this manuscript.Funding DetailsFT120100004, ARC, Australian Research Council; FL100100195, ARC, Australian Research Council; FT100100443, ARC, Australian Research Council
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1st AuthorFogwill, C.AuthorFogwill, C.Turney, C.Meissner, K.Golledge, N.Spence, P.Roberts, J.England, M.Jones, R.Carter, L.Year2014JournalJournal of Quaternary ScienceVolume29Number1Pages91-98DOI10.1002/jqs.2683URLhttps://www.scopus.com/inward/recor.....34f8d8cabf6ae727125cc8c6eKeywordsice sheetLast Interglacialsea levelsensitivity analysisSouthern Hemispherewarmingwesterly, Southern Ocean, rank3Author KeywordsEast Antarctic Ice SheetLast InterglacialSouthern Annual ModeSouthern Hemisphere WesterliesSouthern Ocean
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TypeArticleCitationFogwill, C., Turney, C., Meissner, K., Golledge, N., Spence, P., Roberts, J., England, M., Jones, R. and Carter, L. (2014). Testing the sensitivity of the East Antarctic Ice Sheet to Southern Ocean dynamics: Past changes and future implications. Journal of Quaternary Science, 29(1): 91-98 IdentifierFogwill2014Relevancerank3
Carter, L., Testing the sensitivity of the East Antarctic Ice Sheet to S , [Fogwill2014]. Antarctica NZ, accessed 11/09/2024, https://adam.antarcticanz.govt.nz/nodes/view/63496, 10.1002/jqs.2683