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

Gao, Dongdong; Jin, Guangzhen; Lü, Xianqing

doi:10.1007/s00343-016-5168-0

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…7. Similar to the barotropic tides, the amplitudes of the two baroclinic tidal constituents are comparable (2-4 cm/s), which is diff erent from that in the northeastern continental shelf of the SCS, where the baroclinic K 1 tide is stronger than the M 2 tide (Gao et al, 2017). The K 1 tide shows a fi rst-mode structure at the three stations, as does the M 2 tide at H03, as there is only one current reversal in the vertical.…”

Section: Primary Propertymentioning

confidence: 86%

Tidal currents in the coastal waters east of Hainan Island in winter

Xie

Zong

et al. 2021

J. Ocean. Limnol.

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Using the 25-h continuing hydrographic observations at three successive stations in February 2012 and the mooring time series of current observations from January to March 2015, the tidal currents and tidal energy fl uxes in the coastal waters east of Hainan Island in the northwestern South China Sea were analyzed. The diurnal and semidiurnal (using K 1 and M 2 as proxies, respectively) tidal currents and associated isopycnal undulations were derived with harmonic analysis. Results show that the velocities of the diurnal and semidiurnal tides derived from the 25-h observations are comparable to those from the mooring series. The semi-major axes of the tidal ellipses were O (4-7 cm/s) for barotropic tides and O (2-4 cm/s) for baroclinic tides. The directions were in NE-SW at deeper stations to N-S at the shallowest station for the diurnal tide and from NW-SE to NE-SW for the semidiurnal tide. Both the diurnal and semidiurnal isopycnal fl uctuations reached O (5 m), O (8 m), and O (10 m) at the cross-shelf stations (H03, H04, and H05) from 35 m, 45 m, to 55 m, respectively, showing insignifi cant vertical variation, and the barotropic signals were predominate. The baroclinic diurnal tide showed fi rst-mode structures at H03-05, as does the semidiurnal tide at H03. The semidiurnal tide at H04 and H05 exhibited higher-mode structures. The time series of both the alongshore and cross-shore components reveal the vertically propagation features of the baroclinic tidal phase and energy. The calculated horizontal energy fl uxes of the diurnal and semidiurnal internal tides decreased from O (0.1 W/m) at H05 to O (0.01 W/m) at H03, implying a propagation and dissipation of energy from off shore to inshore.

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Section: Primary Propertymentioning

confidence: 86%

Tidal currents in the coastal waters east of Hainan Island in winter

Xie

Zong

et al. 2021

J. Ocean. Limnol.

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Effects of internal waves on bottom thermal structures and turbulent mixing in the Xisha Islands

Zhu,

Cen,

Zhou

et al. 2024

Deep Sea Research Part I: Oceanographic Research Papers

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Determination of Harmonic Parameters with Temporal Variations: An Enhanced Harmonic Analysis Algorithm and Application to Internal Tidal Currents in the South China Sea

Jin

Pan

Zhang

et al. 2018

Journal of Atmospheric and Oceanic Technology

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As an effective tool to distinguish different tidal components, classical tidal current harmonic analysis has been widely used to obtain harmonic parameters of internal tidal currents. However, harmonic parameters cannot exactly reveal the motion of internal tides, as the irregular temporal variations for internal tides are significant in many regions of the world’s oceans. An enhanced harmonic analysis (EHA) algorithm based on the independent point scheme and cubic spline interpolation is presented in this paper to obtain harmonic parameters with temporal variations for different tidal constituents of internal tides. Moreover, this algorithm is applied to analyze 14 months of current data obtained from a mooring located on the continental shelf in the northeastern region of the South China Sea. The obvious irregular temporal variations for the four principal constituents—M2, K1, S2, and O1—of internal tides in this region are indicated. It is hoped that this algorithm might present a brand-new view for researchers to investigate the irregular temporal motions of internal tides.

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

Cited by 3 publications

References 28 publications

Tidal currents in the coastal waters east of Hainan Island in winter

Tidal currents in the coastal waters east of Hainan Island in winter

Effects of internal waves on bottom thermal structures and turbulent mixing in the Xisha Islands

Determination of Harmonic Parameters with Temporal Variations: An Enhanced Harmonic Analysis Algorithm and Application to Internal Tidal Currents in the South China Sea

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