Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination
dc.contributor.author | Fogwill, C. | |
dc.contributor.author | Turney, C. | |
dc.contributor.author | Golledge, N. | |
dc.contributor.author | Etheridge, D. | |
dc.contributor.author | Rubino, M. | |
dc.contributor.author | Thornton, D. | |
dc.contributor.author | Baker, A. | |
dc.contributor.author | Woodward, J. | |
dc.contributor.author | Winter, K. | |
dc.contributor.author | Van Ommen, T. | |
dc.contributor.author | Moy, A. | |
dc.contributor.author | Curran, M. | |
dc.contributor.author | Davies, S. | |
dc.contributor.author | Weber, M. | |
dc.contributor.author | Bird, M. | |
dc.contributor.author | Munksgaard, N. | |
dc.contributor.author | Menviel, L. | |
dc.contributor.author | Rootes, C. | |
dc.contributor.author | Ellis, B. | |
dc.contributor.author | Millman, H. | |
dc.contributor.author | et al. | |
dc.date.issued | 2017 | |
dc.description.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. | |
dc.description.statementofresponsibility | C.J. Fogwill ... & A. Cooper | |
dc.identifier.citation | Scientific Reports, 2017; 7(1):39979-1-39979-10 | |
dc.identifier.doi | 10.1038/srep39979 | |
dc.identifier.issn | 2045-2322 | |
dc.identifier.issn | 2045-2322 | |
dc.identifier.orcid | Cooper, A. [0000-0002-7738-7851] | |
dc.identifier.uri | http://hdl.handle.net/2440/103934 | |
dc.language.iso | en | |
dc.publisher | Nature Publishing Group | |
dc.relation.grant | http://purl.org/au-research/grants/arc/LP120200724 | |
dc.relation.grant | http://purl.org/au-research/grants/arc/DE150100107 | |
dc.rights | © The Author(s) 2017 | |
dc.source.uri | https://doi.org/10.1038/srep39979 | |
dc.title | Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination | |
dc.type | Journal article | |
pubs.publication-status | Published |