Antarctic contribution to meltwater pulse 1A from reduced Southern Ocean
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TitleAntarctic contribution to meltwater pulse 1A from reduced Southern Ocean overturningAbstractDuring the last glacial termination, the upwelling strength of the southern polar limb of the Atlantic Meridional Overturning Circulation varied, changing the ventilation and stratification of the high-latitude Southern Ocean. During the same period, at least two phases of abrupt global sea-level rise - meltwater pulses - took place. Although the timing and magnitude of these events have become better constrained, a causal link between ocean stratification, the meltwater pulses and accelerated ice loss from Antarctica has not been proven. Here we simulate Antarctic ice sheet evolution over the last 25-kyr using a data-constrained ice-sheet model forced by changes in Southern Ocean temperature from an Earth system model. Results reveal several episodes of accelerated ice-sheet recession, the largest being coincident with meltwater pulse 1A. This resulted from reduced Southern Ocean overturning following Heinrich Event 1, when warmer subsurface water thermally eroded grounded marine-based ice and instigated a positive feedback that further accelerated ice-sheet retreat. Copyright 2014 Macmillan Publishers Limited. All rights reserved.AcknowledgementsN.R.G. gratefully acknowledges ongoing support from Kevin Buckley and the Victoria University high-performance compute cluster, and the PISM group at the University of Alaska, Fairbanks. George Denton is thanked for useful discussions. This work was supported by the Antarctic Research Centre, Victoria University of Wellington, ANDRILL, GNS Science, the Australian Research Council (ARC) including the ARC Centre of Excellence in Climate System Science, and an award under the Merit Allocation Scheme on the NCI National Facility at the Australian National University, Canberra.Funding DetailsARC, ARC, Australian Research Council
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1st AuthorGolledge, N.AuthorGolledge, N.Menviel, L.Carter, L.Fogwill, C.England, M.Cortese, G.Levy, R.Year2014JournalNature CommunicationsVolume5DOI10.1038/ncomms6107URLhttps://www.scopus.com/inward/recor.....711b3409b792a2f5d15af3b2bKeywordssurface water, Heinrich eventice retreatice sheetLast Glaciallatitudemeltwateroverturnsea level changeupwelling, AntarcticaArticleclimate changeflow rateglacierglobal positioning systemice sheeticebergpositive feedbackseasea levelsea level risesedimentSouthern Hemispheretemperaturewarming, Southern Ocean, rank3
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TypeArticleCitationGolledge, N., Menviel, L., Carter, L., Fogwill, C., England, M., Cortese, G. and Levy, R. (2014). Antarctic contribution to meltwater pulse 1A from reduced Southern Ocean overturning. Nature Communications, 5 IdentifierGolledge2014Relevancerank3
Levy, R., Antarctic contribution to meltwater pulse 1A from reduced Southern Ocean , [Golledge2014]. Antarctica NZ, accessed 03/10/2023, https://adam.antarcticanz.govt.nz/nodes/view/63519, 10.1038/ncomms6107