Nonlinear internal wave spirals in the northern East China Sea

Scientific Reports
SungHyun NamYang-Ki Cho

Abstract

Oceanic internal waves are known to be important to the understanding of underwater acoustics, marine biogeochemistry, submarine navigation and engineering, and the Earth's climate. In spite of the importance and increased knowledge of their ubiquity, the wave generation is still poorly understood in most parts of the world's oceans. Here, we use satellite synthetic aperture radar images, in-situ observations, and numerical models to (1) show that wave energy (having relatively high amplitude) radiates from a shallow sill in the East China Sea in all directions, but with a significant time lag dependent on background conditions, (2) reveal that wave fronts are locally formed with often favorable conditions for re-initiation, and (3) demonstrate the resulting variety of wave patterns. These findings would be the case for any broad shelf having shallow sills with time-varying conditions, and therefore have significant implications on the redistribution of energy and materials in the global as well as regional ocean.

References

Jan 17, 2013·Marine Pollution Bulletin·Chang-Sin KimSung Hyup You
May 8, 2015·Nature·Matthew H AlfordTswen-Yung David Tang

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Citations

Nov 15, 2018·The Journal of the Acoustical Society of America·Zhuqing YuanShefeng Yan
Apr 2, 2018·The Journal of the Acoustical Society of America·Gihoon ByunSung-Hoon Byun

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