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Doubling of surface oceanic meridional heat transport by non-symmetry of mesoscale eddies

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  • Hailin Wang

    (Ocean University of China)

  • Bo Qiu

    (University of Hawaii at Manoa)

  • Hanrui Liu

    (Ocean University of China)

  • Zhengguang Zhang

    (Ocean University of China
    Laoshan Laboratory)

Abstract

Oceanic transport of heat by ubiquitous mesoscale eddies plays a critical role in regulating climate variability and redistributing excess heat absorbed by ocean under global warming. Eddies have long been simplified as axisymmetric vortices and their influence on heat transport remains unclear. Here, we combine satellite and drifter data and show that oceanic mesoscale eddies are asymmetric and directionally-dependent, and are controlled by their self-sustaining nature and their dynamical environment. Both the direction and amplitude of eddy-induced heat fluxes are significantly influenced by eddy’s asymmetry and directional dependence. When the eddy velocity field is decomposed into asymmetric and symmetric components, the eddy kinetic energy exhibits a nearly equal partition between these two components. The total eddy-induced meridional heat flux similarly doubles the heat flux induced by the symmetric components, highlighting the crucial contribution of eddy asymmetry on the magnitude of eddy-induced oceanic heat transport.

Suggested Citation

  • Hailin Wang & Bo Qiu & Hanrui Liu & Zhengguang Zhang, 2023. "Doubling of surface oceanic meridional heat transport by non-symmetry of mesoscale eddies," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41294-7
    DOI: 10.1038/s41467-023-41294-7
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