Observation of internal tides and near-inertial internal waves on the continental slope in the northwestern South China Sea

Liang Hui; Zheng Jie; Tian Jiwei

doi:10.3969/j.issn.0253-4193.2016.11.003

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Liang Hui, Zheng Jie, Tian Jiwei. Observation of internal tides and near-inertial internal waves on the continental slope in the northwestern South China Sea[J]. Haiyang Xuebao, 2016, 38(11): 32-42. doi: 10.3969/j.issn.0253-4193.2016.11.003

Citation:

Liang Hui, Zheng Jie, Tian Jiwei. Observation of internal tides and near-inertial internal waves on the continental slope in the northwestern South China Sea[J]. Haiyang Xuebao, 2016, 38(11): 32-42. doi: 10.3969/j.issn.0253-4193.2016.11.003

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Observation of internal tides and near-inertial internal waves on the continental slope in the northwestern South China Sea

doi: 10.3969/j.issn.0253-4193.2016.11.003

1. Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China

Received Date: 2015-04-15
Rev Recd Date: 2015-11-12

Abstract

Abstract

The temporal variability and vertical distribution of barotropic tides, internal tides and near-inertial internal waves (NIW) were investigated on the basis of 3-month moored acoustic Doppler current profiler observations on the continental slope in the northwestern South China Sea in 2006. The diurnal baroclinic constituents are found to be more prominent than the semidiurnal baroclinic ones at mooring site, which are same with the barotropic tides, and amplitudes of the internal tides are stronger in the thermocline, and then decreases with depth. Almost all the major axes of the internal tidal ellipses are perpendicular to the local isobaths, that is, along the southeast-northwest direction approximately. Spring-neap oscillations of about 14 days can be seen at mooring site during observational periods. The coherent diurnal (semidiurnal) internal tidal motions could explain 70% (53%) of the total energy in the diurnal (semidiurnal) tidal band. Further analysis demonstrates that the semidiurnal internal tides are dominated by the first mode, whereas the diurnal internal tides show a variable multimodal structure:the third mode plays a secondary role and is comparable to the first mode. During the passage of Typhoon, the NIW became more energetic. Mesoscale warm eddies are the chimneys through which the near-inertial wind work penetrates rapidly into the deep ocean, and then cold eddies could probably inhibit the downward propagation of the near-inertial wind work.
- South China Sea,
- internal tides,
- near-inertial internal waves

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