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Enhanced generation of internal tides under global warming

Author

Listed:
  • Zhibin Yang

    (Laoshan Laboratory)

  • Zhao Jing

    (Laoshan Laboratory
    Ocean University of China)

  • Xiaoming Zhai

    (University of East Anglia)

  • Clément Vic

    (IUEM)

  • Hui Sun

    (Ocean University of China)

  • Casimir Lavergne

    (Sorbonne Université/IRD/CNRS/MNHN)

  • Man Yuan

    (Ocean University of China)

Abstract

A primary driver of deep-ocean mixing is breaking of internal tides generated via interactions of barotropic tides with topography. It is important to understand how the energy conversion from barotropic to internal tides responds to global warming. Here we address this question by applying a linear model of internal tide generation to coupled global climate model simulations under a high carbon emission scenario. The energy conversion to high-mode internal tides is projected to rise by about 8% by the end of the 21st century, whereas the energy conversion to low-mode internal tides remains nearly unchanged. The intensified near-bottom stratification under global warming increases energy conversion into both low and high-mode internal tides. In contrast, the intensified depth-averaged stratification reduces the modal horizontal wavenumber of internal tides, leading to increased (decreased) energy conversion into high (low)- mode internal tides. Our findings imply stronger mixing over rough topography under global warming, which should be properly parameterized in climate models for more accurate projections of future climate changes.

Suggested Citation

  • Zhibin Yang & Zhao Jing & Xiaoming Zhai & Clément Vic & Hui Sun & Casimir Lavergne & Man Yuan, 2024. "Enhanced generation of internal tides under global warming," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52073-3
    DOI: 10.1038/s41467-024-52073-3
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    References listed on IDEAS

    as
    1. G. D. Egbert & R. D. Ray, 2000. "Significant dissipation of tidal energy in the deep ocean inferred from satellite altimeter data," Nature, Nature, vol. 405(6788), pages 775-778, June.
    2. Guancheng Li & Lijing Cheng & Jiang Zhu & Kevin E. Trenberth & Michael E. Mann & John P. Abraham, 2020. "Increasing ocean stratification over the past half-century," Nature Climate Change, Nature, vol. 10(12), pages 1116-1123, December.
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