Coherent and incoherent internal tides in the southern South China Sea

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• 作者：Qian Liu 刘倩 ; Xiaohui Xie 谢晓辉…
• 关键词：internal tides ; coherent ; incoherent ; kinetic energy ; South China Sea
• 刊名：Chinese Journal of Oceanology and Limnology
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：6
• 页码：1374-1382
• 全文大小：1,997 KB
• 刊物主题：Oceanography;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5005
• 卷排序：34

文摘

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 Q₁, O₁, P₁ and K₁ and semidiurnal M₂. 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.