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A deep Tasman outflow of Pacific waters during the last glacial period

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  • Torben Struve

    (Imperial College London
    Imperial College London
    University of Oldenburg)

  • David J. Wilson

    (Imperial College London
    University of London)

  • Sophia K. V. Hines

    (California Institute of Technology
    Columbia University
    Woods Hole Oceanographic Institution)

  • Jess F. Adkins

    (California Institute of Technology)

  • Tina Flierdt

    (Imperial College London)

Abstract

The interoceanic exchange of water masses is modulated by flow through key oceanic choke points in the Drake Passage, the Indonesian Seas, south of Africa, and south of Tasmania. Here, we use the neodymium isotope signature (εNd) of cold-water coral skeletons from intermediate depths (1460‒1689 m) to trace circulation changes south of Tasmania during the last glacial period. The key feature of our dataset is a long-term trend towards radiogenic εNd values of ~−4.6 during the Last Glacial Maximum and Heinrich Stadial 1, which are clearly distinct from contemporaneous Southern Ocean εNd of ~−7. When combined with previously published radiocarbon data from the same corals, our results indicate that a unique radiogenic and young water mass was present during this time. This scenario can be explained by a more vigorous Pacific overturning circulation that supported a deeper outflow of Pacific waters, including North Pacific Intermediate Water, through the Tasman Sea.

Suggested Citation

  • Torben Struve & David J. Wilson & Sophia K. V. Hines & Jess F. Adkins & Tina Flierdt, 2022. "A deep Tasman outflow of Pacific waters during the last glacial period," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31116-7
    DOI: 10.1038/s41467-022-31116-7
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    References listed on IDEAS

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    1. L. C. Skinner & F. Primeau & E. Freeman & M. de la Fuente & P. A. Goodwin & J. Gottschalk & E. Huang & I. N. McCave & T. L. Noble & A. E. Scrivner, 2017. "Radiocarbon constraints on the glacial ocean circulation and its impact on atmospheric CO2," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    2. Edouard Bard & Rosalind E. M. Rickaby, 2009. "Migration of the subtropical front as a modulator of glacial climate," Nature, Nature, vol. 460(7253), pages 380-383, July.
    3. Rong Hu & Alexander M. Piotrowski, 2018. "Neodymium isotope evidence for glacial-interglacial variability of deepwater transit time in the Pacific Ocean," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
    4. Ning Zhao & Delia W. Oppo & Kuo-Fang Huang & Jacob N. W. Howe & Jerzy Blusztajn & Lloyd D. Keigwin, 2019. "Glacial–interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
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