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Type: Journal article
Title: Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination
Author: Fogwill, C.
Turney, C.
Golledge, N.
Etheridge, D.
Rubino, M.
Thornton, D.
Baker, A.
Woodward, J.
Winter, K.
Van Ommen, T.
Moy, A.
Curran, M.
Davies, S.
Weber, M.
Bird, M.
Munksgaard, N.
Menviel, L.
Rootes, C.
Ellis, B.
Millman, H.
et al.
Citation: Scientific Reports, 2017; 7(1):39979-1-39979-10
Publisher: Nature Publishing Group
Issue Date: 2017
ISSN: 2045-2322
Statement of
C.J. Fogwill ... & A. Cooper
Abstract: Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved 'horizontal ice core' from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,600-12,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise.
Rights: © The Author(s) 2017
RMID: 0030062394
DOI: 10.1038/srep39979
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Appears in Collections:Australian Centre for Ancient DNA publications

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