Effects of typhoon and the mesoscale warm eddy on the near-inertial oscillations in the northern of the South China Sea

Yu Lusha; Zhai Rongwei; Lu Yuanzheng; Guo Shuangxi; Qu ling; Cen Xianrong; Zhang Kang; Huang Pengqi; Shang Xiaodong; Zhou Shengqi

doi:10.3969/j.issn.0253-4193.2020.01.001

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Yu Lusha，Zhai Rongwei，Lu Yuanzheng, et al. Effects of typhoon and the mesoscale warm eddy on the near-inertial oscillations in the northern of the South China Sea[J]. Haiyang Xuebao，2020, 42(1)：1–11，doi:10.3969/j.issn.0253−4193.2020.01.001

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Effects of typhoon and the mesoscale warm eddy on the near-inertial oscillations in the northern of the South China Sea

doi: 10.3969/j.issn.0253-4193.2020.01.001

Yu Lusha^{1, 2
,},
Zhai Rongwei^{1, 2},
Lu Yuanzheng^{1, 3},
Guo Shuangxi^{1, 3},
Qu ling^{1, 3},
Cen Xianrong^{1, 3},
Zhang Kang^{1, 2},
Huang Pengqi^{1, 2},
Shang Xiaodong^{1, 3},
Zhou Shengqi^{1, 3
,
,}

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2018-11-05
Rev Recd Date: 2019-03-14

Available Online: 2021-04-21

Publish Date: 2020-01-25

Abstract

Abstract

Two moorings (Station A, 20.736°N, 117.745°E, 1 249 m; Station B, 20.835°N, 117.56°E, 848 m) were located near the Dongsha Islands in the northern of the South China Sea from August to September 2014. Based on the measured data, we have studied the characteristics of near-inertial oscillations (NIOs) induced by typhoons, and analyzed the modulation of mesoscale warm eddy on the near-inertial frequency and its influence on the distribution and propagation of near-inertial kinetic energy (NIKE).The frequency of the NIOs at Station A (B) is 0.659 2 circle per day< at depths shallower than 142 (175) m with a redshift of 7.2% (7.6%) from the local initial frequency of 0.710 1 (0.713 3) circle per day, which is consistent with their background vorticities. The mesoscale warm eddy changes the stratification, which causes the NIKE of the two stations modified by 0.5−3 times in different stratifications. The refraction effect of stratification on energy makes the NIKE relatively concentrate with small decay between 158 and 223 m at Station B but rapidly decrease at Station A. The vertical group velocities of near-inertial internal waves at Station A and Station B are approximately 15.2 m/d and 14.1 m/d. Ignore the loss of NIKE in horizontal direction, their vertical propagation causes approximately 47% and 38% of NIKE decay in vertical direction, respectively.spectively.
- northern South China Sea,
- typhoon,
- near-inertial oscillations,
- mesoscale warm eddy,
- stratification

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References(24)

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