Temporal variations in internal tide multimodal structure on the continental shelf, South China Sea

Dalu Gao; Guangzhen Jin; Xianqing Lü

doi:10.1007/s00343-016-5168-0

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Temporal variations in internal tide multimodal structure on the continental shelf, South China Sea

Updated：2023-05-16

- Temporal variations in internal tide multimodal structure on the continental shelf, South China Sea
- Journal of Oceanology and Limnology Vol. 35, Issue 1, Pages: 70-78(2017)
- Affiliations：
  
  1. Key Laboratory of Physical Oceanography (Ocean University of China) Ministry of Education
  2. Key Lab of Marine Science and Numerical Modeling First Institute of Oceanography SOA
- Author bio：
- Funds：
- DOI：10.1007/s00343-016-5168-0
  CLC：
- Online First：21 April 2016，
  
  Published：2017
- Accepted：
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Gao, D., Jin, G. & Lü, X. Temporal variations in internal tide multimodal structure on the continental shelf, South China Sea., Chin. J. Ocean. Limnol. 35, 70–78 (2017). https://doi.org/10.1007/s00343-016-5168-0
DOI：

Gao, D., Jin, G. & Lü, X. Temporal variations in internal tide multimodal structure on the continental shelf, South China Sea., Chin. J. Ocean. Limnol. 35, 70–78 (2017). https://doi.org/10.1007/s00343-016-5168-0 DOI：

摘要

Abstract

Temporal variations in multimodal structures of diurnal (D 1) and semidiurnal (D 2) internal tides were investigated on the continental slope of the Dongsha Plateau

based on 2-month moored acoustic Doppler current profiler observations. Harmonic analysis indicated that the D 1 components (K 1 and O 1) dominated the internal tide field. The vertical structure of the K 1 constituent presented a first-mode structure while the M 2 constituent seemed to exhibit a high-mode structure. Amplitude spectra analysis of the current data revealed differences in baroclinic current amplitudes between different water depths. Temporal variations in modal structures ware analyzed

based on the D 1 and D 2 baroclinic tides extracted from the baroclinic velocity field with band-pass filters. Analysis showed that the magnitude of the D 1 internal tide current was much larger than the D 2 current

and temporal variations in the modal structure of the D 1 internal tide occurred on an approximately fortnightly cycle. The EOF analyses revealed temporal transformation of multimodal structures for D 1 and D 2 internal tides. The enhancement of the D 1 internal tide was mainly due to the superposition of K 1 and O 1

according to the temporal variation of coherent kinetic energy.

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references

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