Temporal variations in internal tide multimodal structure on the continental shelf,South China Sea |
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| Authors: | Dalu?Gao Email author" target="_blank">Guangzhen?JinEmail author Xianqing?Lü |
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| Institution: | 1.Key Laboratory of Physical Oceanography (Ocean University of China),Ministry of Education,Qingdao,China;2.Key Lab of Marine Science and Numerical Modeling, First Institute of Oceanography,SOA,Qingdao,China |
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| 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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