Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (3): 270-280. doi: 10.11867/j.issn.1001-8166.2018.03.0270

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Characteristics of Near-inertial Oscillation Influenced by Western Boundary Current of South China Sea

Senhui Jiang 1( ), Zewen Wu 2, Xiejun Shu 3   

  1. 1.School of Harbor Engineering, Guangzhou Maritime University, Guangzhou 510725, China
    2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
    3.South China Sea Institute of Planning and Environmental Research, State Oceanic Administration, People’s Republic of China, Guangzhou 510310, China;
  • Received:2017-11-09 Revised:2018-02-02 Online:2018-03-20 Published:2018-05-02
  • About author:

    First author:Jiang Senhui(1983- ), male, Taizhou City, Zhejiang Province, Lecturer. Research areas include ocean wave motion and

  • Supported by:
    Project supported by the Guangdong Higher Education Innovation Strong School Project “The characteristics of the turbulent stress and its influence mechanism based on the ADCP observation data”(No.E410709).

Senhui Jiang, Zewen Wu, Xiejun Shu. Characteristics of Near-inertial Oscillation Influenced by Western Boundary Current of South China Sea[J]. Advances in Earth Science, 2018, 33(3): 270-280.

Based on observed velocity data of ADCP for near-inertial wave evolution characteristics of generation and propagation, the difference of shifting effect was found in winter and summer. The background circulation in winter and summer is northeast and southwest, respectively. The diversity of the background flow directions may take an important part in shifting effect of the near-inertial wave motion. According to the different directions of the background circulation, the signals of near-inertial oscillation were screened out and analyzed by synthesis for discussing how the directions of background circulation affected the characteristics of near-inertial oscillation. The mechanism of this effect was explained from the perspective of background vorticity: As the direction of background circulation is the northeast, the background vorticity becomes negative and the effective frequency decreases, the near-inertial oscillation frequency shifts to low frequency band (red shift); contrarily, the background vorticity becomes positive and the effective frequency increases with the southwest background circulation, the near-inertial oscillation frequency shifts to high frequency band (blue shift).

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