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

Author

Listed:
  • Chris S. M. Turney

    (University of New South Wales
    University of New South Wales
    School of Biological, Earth and Environmental Sciences, University of New South Wales)

  • Richard T. Jones

    (University of Exeter)

  • Steven J. Phipps

    (University of New South Wales
    Institute for Marine and Antarctic Studies, University of Tasmania)

  • Zoë Thomas

    (University of New South Wales
    University of New South Wales
    School of Biological, Earth and Environmental Sciences, University of New South Wales)

  • Alan Hogg

    (University of Waikato)

  • A. Peter Kershaw

    (Monash University)

  • Christopher J. Fogwill

    (University of New South Wales
    University of New South Wales)

  • Jonathan Palmer

    (University of New South Wales
    University of New South Wales
    School of Biological, Earth and Environmental Sciences, University of New South Wales)

  • Christopher Bronk Ramsey

    (University of Oxford)

  • Florian Adolphi

    (Lund University
    University of Bern)

  • Raimund Muscheler

    (Lund University)

  • Konrad A. Hughen

    (Woods Hole Oceanographic Institution)

  • Richard A. Staff

    (University of Oxford
    University of Glasgow)

  • Mark Grosvenor

    (University of Exeter)

  • Nicholas R. Golledge

    (Victoria University of Wellington
    GNS Science)

  • 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)

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.

Suggested Citation

  • 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 M, 2017. "Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00577-6
    DOI: 10.1038/s41467-017-00577-6
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