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Coherent and incoherent internal tides in the southern South China Sea

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Abstract

Coherent and incoherent internal tides (CITs and ICITs) in the southern South China Sea were investigated from two sets of 18-month mooring current records. The CITs were mainly composed of diurnal Q 1, O 1, P 1 and K 1 and semidiurnal M 2. The observed diurnal internal tides (ITs) were more coherent than the semidiurnal constituents. Coherent diurnal variance accounted for approximately 58% of the diurnal motion, whereas semidiurnal tides contained a much smaller fraction (35%) of coherent motion. The ICITs mainly consisted of motion at non-tidal harmonic frequencies around the tidal frequency, and showed clear intermittency. The modal decomposition of CITs and ICITs showed that CITs were dominated by mode- 1, whereas mode-1 and higher modes in ICITs signals showed comparable amplitudes. CITs and ICITs accounted for approximately 64% and 36% of the total kinetic energy of internal tides, respectively.

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Authors and Affiliations

  1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China

    Qian Liu  (刘倩), Xiaohui Xie  (谢晓辉), Xiaodong Shang  (尚晓东) & Guiying Chen  (陈桂英)

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Qian Liu  (刘倩)

Authors
  1. Qian Liu  (刘倩)
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  2. Xiaohui Xie  (谢晓辉)
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  3. Xiaodong Shang  (尚晓东)
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  4. Guiying Chen  (陈桂英)
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Corresponding author

Correspondence to Xiaodong Shang  (尚晓东).

Additional information

Supported by the Special Fund of the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA11010202), the National Basic Research Program of China (973 Program) (No. 2013CB430303), the National Natural Science Foundation of China (NSFC) (Nos. 41376022, 41276021), and the CAS/SAFEA International Partnership Program for Creative Research Teams

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Liu, Q., Xie, X., Shang, X. et al. Coherent and incoherent internal tides in the southern South China Sea. Chin. J. Ocean. Limnol. 34, 1374–1382 (2016). https://doi.org/10.1007/s00343-016-5171-5

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  • DOI: https://doi.org/10.1007/s00343-016-5171-5

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