title: Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination.
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.
authors.affiliation: PANGEA Research Centre, University of New South Wales, 2052, Australia.|Climate Change Research Centre, School of Biological Earth and Environmental Sciences, University of New South Wales, 2052, Australia.
authors.forename: C J
authors.initials: CJ
authors.lastname: Fogwill
authors.affiliation: PANGEA Research Centre, University of New South Wales, 2052, Australia.|Climate Change Research Centre, School of Biological Earth and Environmental Sciences, University of New South Wales, 2052, Australia.
authors.forename: C S M
authors.initials: CS
authors.lastname: Turney
authors.affiliation: Antarctic Research Centre, Victoria University of Wellington, Wellington 6140, New Zealand.|GNS Science, Avalon, Lower Hutt, New Zealand.
authors.forename: N R
authors.initials: NR
authors.lastname: Golledge
authors.affiliation: CSIRO Climate Science Centre, Oceans and Atmosphere, Aspendale, Victoria, 3195 Australia.
authors.forename: D M
authors.initials: DM
authors.lastname: Etheridge
authors.affiliation: CSIRO Climate Science Centre, Oceans and Atmosphere, Aspendale, Victoria, 3195 Australia.|Dipartimento di Matematica e Fisica, Università della Campania - Luigi Vanvitelli, viale Lincoln, 5-81100 Caserta, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Rubino
authors.affiliation: CSIRO Climate Science Centre, Oceans and Atmosphere, Aspendale, Victoria, 3195 Australia.
authors.forename: D P
authors.initials: DP
authors.lastname: Thornton
authors.affiliation: PANGEA Research Centre, University of New South Wales, 2052, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Baker
authors.affiliation: Department of Geography, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Woodward
authors.affiliation: Department of Geography, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Winter
authors.affiliation: Australian Antarctic Division, 203 Channel Highway, Kingston, Tasmania 7050, Australia.|Antarctic Climate &Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia.
authors.forename: T D
authors.initials: TD
authors.lastname: van Ommen
authors.affiliation: Australian Antarctic Division, 203 Channel Highway, Kingston, Tasmania 7050, Australia.|Antarctic Climate &Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia.
authors.forename: A D
authors.initials: AD
authors.lastname: Moy
authors.affiliation: Australian Antarctic Division, 203 Channel Highway, Kingston, Tasmania 7050, Australia.|Antarctic Climate &Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia.
authors.forename: M A J
authors.initials: MA
authors.lastname: Curran
authors.affiliation: Department of Geography, College of Science, Swansea University, Swansea, United Kingdom.
authors.forename: S M
authors.initials: SM
authors.lastname: Davies
authors.affiliation: Department of Earth Sciences, University of Cambridge, Drummond Street, Cambridge, United Kingdom.|Steinmann Institute, University of Bonn, Poppelsdorfer Schloss, Bonn, Germany.
authors.forename: M E
authors.initials: ME
authors.lastname: Weber
authors.affiliation: Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia.
authors.forename: M I
authors.initials: MI
authors.lastname: Bird
authors.affiliation: Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia.|Research Institute for the Environment and Livelihoods, Charles Darwin University, Australia.
authors.forename: N C
authors.initials: NC
authors.lastname: Munksgaard
authors.affiliation: PANGEA Research Centre, University of New South Wales, 2052, Australia.|Climate Change Research Centre, School of Biological Earth and Environmental Sciences, University of New South Wales, 2052, Australia.
authors.forename: L
authors.initials: L
authors.lastname: Menviel
authors.affiliation: Department of Geography, University of Sheffield, United Kingdom.
authors.forename: C M
authors.initials: CM
authors.lastname: Rootes
authors.affiliation: Research School of Earth Sciences, Australian National University, Canberra, Australia.
authors.forename: B
authors.initials: B
authors.lastname: Ellis
authors.affiliation: Climate Change Research Centre, School of Biological Earth and Environmental Sciences, University of New South Wales, 2052, Australia.
authors.forename: H
authors.initials: H
authors.lastname: Millman
authors.affiliation: PANGEA Research Centre, University of New South Wales, 2052, Australia.|Climate Change Research Centre, School of Biological Earth and Environmental Sciences, University of New South Wales, 2052, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Vohra
authors.affiliation: Glaciology and Climate Change Laboratory, Centro de Estudios Cientficos, Valdivia, Arturo Prat 514, Chile.|Department of Geography, University of Chile, Santiago, Chile.
authors.forename: A
authors.initials: A
authors.lastname: Rivera
authors.affiliation: Australian Centre for Ancient DNA, University of Adelaide, 5005, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Cooper