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https://hdl.handle.net/2440/103934
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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 2045-2322 |
Statement of Responsibility: | 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 |
DOI: | 10.1038/srep39979 |
Grant ID: | http://purl.org/au-research/grants/arc/DE150100107 |
Published version: | http://dx.doi.org/10.1038/srep39979 |
Appears in Collections: | Aurora harvest 3 Australian Centre for Ancient DNA publications |
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