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Variability of the M2 internal tides in the Luzon Strait under climate change

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Abstract

Internal tides (ITs) radiated from the Luzon Strait (LS) to the South China Sea (SCS) exhibit variability closely related to changes of stratification. Based on the CanESM5 simulation from the sixth phase of Coupled Model Intercomparison Project, the stratification within the LS will increase in the following century due to climate change resulting from human activities. Here we conduct numerical experiments to investigate changes of the M2 ITs under different shared socioeconomic pathway (SSP) scenarios. Results show that the cumulative generation of ITs within the LS weakens with strengthening stratification. The amount of ITs generated in the LS will decrease by 22.7% (2.7%) and that propagating into the SCS will decrease by 27.9% (4.4%) in a century under the SSP5-8.5 (SSP1-2.6) scenario that represents the high (low) end of future emissions. The changes are attributed to the interference of the M2 ITs within the double ridges, which weakens as the stratification strengthens and finally reduces the IT generation. Considering that ITs are one of the most important energy sources for diapycnal mixing, the decrease in ITs would have significant physical and biogeochemical implications in the LS and the SCS.

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Data availability

CanESM5 data used in this study can be downloaded from the CMIP6 database at https://esgf-node.llnl.gov/projects/cmip6/.

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Acknowledgements

This study is supported by the Bureau of Science and Technology of Zhoushan through the Zhejiang Ocean University Science and Technology Project (No. 2023C41012) and the National Natural Science Foundation of China (Grant Number: 42176002).

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Authors and Affiliations

  1. Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, China

    Zheng Guo

  2. Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan

    Shuya Wang & Xinyu Guo

  3. Ocean College, Zhejiang University, Zhoushan, China

    Anzhou Cao & Jinbao Song

  4. Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao, China

    Xu Chen

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  1. Zheng Guo
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  6. Xinyu Guo
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Contributions

A Cao and S Wang contributed to the study conception and design. Z Guo conducted numerical experiments, performed the analysis and wrote the first draft of the manuscript. All authors contributed to the discussions, commented on previous versions of the manuscript, read and approved the final manuscript.

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Correspondence to Anzhou Cao.

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Guo, Z., Wang, S., Cao, A. et al. Variability of the M2 internal tides in the Luzon Strait under climate change. Clim Dyn (2024). https://doi.org/10.1007/s00382-024-07148-8

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