Enhancement of near-inertial waves by cyclonic eddy in the northwestern South China Sea during spring 2022

Abstract. By analyzing datasets derived from four moorings during spring 2022, this study provides direct evidence that near-inertial waves (NIWs) can be largely enhanced by a passing cyclonic eddy (CE) in the northwestern South China Sea. Results show that the enhancement of NIWs mainly occurred at north side of the CE due to asymmetry of eddy structure. In vertical, the enhancement concentrated at above 200 m and reached peaks at around 100 m. Significant energy transfer rates between the CE and NIWs appeared at the same depth of the enhancement can reach a magnitude of 10−8 m2 s−3 at the CE's edge. Under the impact of the CE, power of the first five NIWs modes was promoted significantly and dominated by the second and third modes. Overall, the CE transferred energy to NIWs before near-inertial kinetic energy reaching its peaks, while NIWs gave energy back to the CE after the peaks.

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Publication Details

Journal
Ocean science
Published
2025-10-28
DOI
https://doi.org/10.5194/os-21-2631-2025
Primary Topic
Oceanographic and Atmospheric Processes
Type
article
Field-Weighted Citation Impact
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article

Enhancement of near-inertial waves by cyclonic eddy in the northwestern South China Sea during spring 2022

Huichang Jiang, Hongzhou Xu, Ling Wang, Rongjie Chen et al.
Ocean science
Oceanographic and Atmospheric Processes
article

Enhancement of near-inertial waves by cyclonic eddy in the northwestern South China Sea during spring 2022

Huichang Jiang, Hongzhou Xu, Ling Wang, Rongjie Chen, Bo Hong, Sumin Liu, Zhiming Zhang, Qian Chen, Tong Long, Dongxiao Wang, Chunlei Liu, Wei Song
article en

Abstract

Abstract. By analyzing datasets derived from four moorings during spring 2022, this study provides direct evidence that near-inertial waves (NIWs) can be largely enhanced by a passing cyclonic eddy (CE) in the northwestern South China Sea. Results show that the enhancement of NIWs mainly occurred at north side of the CE due to asymmetry of eddy structure. In vertical, the enhancement concentrated at above 200 m and reached peaks at around 100 m. Significant energy transfer rates between the CE and NIWs appeared at the same depth of the enhancement can reach a magnitude of 10−8 m2 s−3 at the CE's edge. Under the impact of the CE, power of the first five NIWs modes was promoted significantly and dominated by the second and third modes. Overall, the CE transferred energy to NIWs before near-inertial kinetic energy reaching its peaks, while NIWs gave energy back to the CE after the peaks.

Ocean scienceVol. 21(5)
Sun Yat-sen University (CN), Chinese Academy of Sciences (CN), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (CN), Institute of Deep-Sea Science and Engineering (CN), University of Chinese Academy of Sciences (CN), Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (CN), Guangdong Ocean University (CN), South China University of Technology (CN)
Openalex Percentile: Top 69%
Oceanographic and Atmospheric Processes
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