Fogwill, CJ and Turney, CSM and Golledge, NR and Etheridge, DM and Rubino, M and Thornton, DP and Baker, A and Woodward, J and Winter, K and van Ommen, TD and Moy, AD and Curran, MAJ and Davies, SM and Weber, ME and Bird, MI and Munksgaard, NC and Menviel, L and Rootes, CM and Ellis, B and Millman, H and Vohra, J and Rivera, A and Cooper, A (2017) Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination. Scientific Reports, 7. 39979 - ?. ISSN 2045-2322

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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.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via Nature Publishing Group at http://www.nature.com/articles/srep39979 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: Cryospheric Science, Palaeoceanography, Palaeoclimate
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Related URLs:
Depositing User: Symplectic
Date Deposited: 24 Aug 2017 09:52
Last Modified: 25 Sep 2017 10:25
URI: http://eprints.keele.ac.uk/id/eprint/3935

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