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Southern Ocean evidence for recurring West Antarctic Ice Sheet destabilization during Marine Isotope Stage 11

Author

Listed:
  • L. Jebasinski

    (Kiel University)

  • D. A. Frick

    (Kiel University)

  • A. K. I. U. Kapuge

    (University of Delaware)

  • C. Basak

    (University of Delaware)

  • M. Saavedra-Pellitero

    (University of Portsmouth)

  • G. Winckler

    (Columbia University)

  • F. Lamy

    (Alfred Wegener Institute (AWI) Helmholtz Centre for Polar and Marine Research)

  • J. Gottschalk

    (Kiel University)

Abstract

Millennial-scale deoxygenation of Antarctic Bottom Water (AABW) in the Atlantic Southern Ocean during past interglacials was linked to West Antarctic Ice Sheet (WAIS) melt-driven suppression of dense water formation along the Antarctic margin. However, the circum-Antarctic extent of these ‘AABW stagnation events’ and drivers of WAIS retreat remain unclear. Here, we identify recurring bottom water O2 minima in the central Pacific Southern Ocean during Marine Isotope Stage (MIS) 11 (424–374 ka ago) that are synchronous with their Atlantic Southern Ocean counterparts. As they (partially) align with Circumpolar Deep Water (CDW) warming above present-day levels and/or a reorganization of deep-ocean circulation, we postulate recurring and synchronized Pacific-Atlantic AABW perturbation events during MIS11 through WAIS retreat and enhanced exposure to ocean heat (i.e., CDW) from below. This indicates a significant contribution of WAIS meltwater to sea-level high-stands during MIS11 and, by analogy, to sea-level rise due to ocean warming in the future.

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  • L. Jebasinski & D. A. Frick & A. K. I. U. Kapuge & C. Basak & M. Saavedra-Pellitero & G. Winckler & F. Lamy & J. Gottschalk, 2025. "Southern Ocean evidence for recurring West Antarctic Ice Sheet destabilization during Marine Isotope Stage 11," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-65002-9
    DOI: 10.1038/s41467-025-65002-9
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