Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial

Chris S. M. Turney (), Richard T. Jones, Steven J. Phipps, Zoë Thomas, Alan Hogg, A. Peter Kershaw, Christopher J. Fogwill, Jonathan Palmer, Christopher Bronk Ramsey, Florian Adolphi, Raimund Muscheler, Konrad A. Hughen, Richard A. Staff, Mark Grosvenor, Nicholas R. Golledge, Sune Olander Rasmussen, David K. Hutchinson, Simon Haberle, Andrew Lorrey, Gretel Boswijk and Alan Cooper
Additional contact information
Chris S. M. Turney: University of New South Wales
Richard T. Jones: University of Exeter
Steven J. Phipps: University of New South Wales
Zoë Thomas: University of New South Wales
Alan Hogg: University of Waikato
A. Peter Kershaw: Monash University
Christopher J. Fogwill: University of New South Wales
Jonathan Palmer: University of New South Wales
Christopher Bronk Ramsey: University of Oxford
Florian Adolphi: Lund University
Raimund Muscheler: Lund University
Konrad A. Hughen: Woods Hole Oceanographic Institution
Richard A. Staff: University of Oxford
Mark Grosvenor: University of Exeter
Nicholas R. Golledge: Victoria University of Wellington
Sune Olander Rasmussen: Niels Bohr Institute, University of Copenhagen
David K. Hutchinson: Stockholm University
Simon Haberle: Australian National University
Andrew Lorrey: National Institute of Water and Atmospheric Research Ltd
Gretel Boswijk: School of Environment, The University of Auckland
Alan Cooper: The University of Adelaide

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Contrasting Greenland and Antarctic temperatures during the last glacial period (115,000 to 11,650 years ago) are thought to have been driven by imbalances in the rates of formation of North Atlantic and Antarctic Deep Water (the ‘bipolar seesaw’). Here we exploit a bidecadally resolved 14C data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, implying limited changes in deep water formation. However, a Southern Ocean (Atlantic-sector) iceberg rafted debris event appears to have occurred synchronously with GI-5.1 warming and decreased precipitation over the western equatorial Pacific and Atlantic. An ensemble of transient meltwater simulations shows that Antarctic-sourced salinity anomalies can generate climate changes that are propagated globally via an atmospheric Rossby wave train.

Date: 2017
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DOI: 10.1038/s41467-017-00577-6

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