Enhanced generation of internal tides under global warming

Zhibin Yang, Zhao Jing (), Xiaoming Zhai, Clément Vic, Hui Sun, Casimir Lavergne and Man Yuan
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Zhibin Yang: Laoshan Laboratory
Zhao Jing: Laoshan Laboratory
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

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-52073-3

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