Kinematic parameters of internal waves of the second mode in the South China Sea

Kurkina, Oxana; Talipova, Tatiana; Soomere, Tarmo; Giniyatullin, Ayrat; Kurkin, Andrey

doi:10.5194/npg-24-645-2017

Cited by 10 publications

(2 citation statements)

References 43 publications

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“…The phase speed for mode-2 ISWs is about half of that of mode-1 ISWs. This result agrees with that by Kurkina et al (2017). The nonlinear effect on the propagation speed is about 6% for mode-1 ISWs and 9% for mode-2 ISWs on average.…”

Section: Propagation Speedmentioning

confidence: 99%

Dynamic and Statistical Features of Internal Solitary Waves on the Continental Slope in the Northern South China Sea Derived From Mooring Observations

et al. 2019

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For investigation of internal solitary waves (ISWs) in the South China Sea (SCS), most cruise observations are concentrated from Luzon Strait to Dongsha Atoll in the northeastern SCS but few on the continental slope far away from the west of Dongsha Atoll. In this study, we use 1‐year long mooring data to determine dynamic and statistical features of the ISWs on the shelf slope of the northwestern SCS. The analysis results of the mooring data reveal that the ocean internal waves on the shelf slope of the northwestern SCS have physical properties of highly nonlinear waves, which are well described by the solutions of the Korteweg‐de Vries equation. The mean nonlinear phase speeds of mode‐1 and mode‐2 ISWs are 1.38 ± 0.14 and 0.66 ± 0.12 m/s, respectively. The major direction of mode‐1 ISWs is northwestward 305° ± 21°. Strong ISW currents force the major direction of total current velocities to turn 67.5° in the upper layer and 135° in the lower layer. The monthly occurrence frequency distribution of ISWs shows a peak in July with a maximum frequency of 16.2% and a trough in March with a minimum frequency of 3.3%. Mode‐2 ISWs appear most in December, accounting for 50% of total mode‐2 ISWs. The largest mode‐2 ISW on record up today with the depressed amplitude as large as 91 m, and the elevated amplitude of 73 m was observed at mooring station. These new findings and new data are of significance to local internal wave prediction model development.

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Section: Propagation Speedmentioning

confidence: 99%

Dynamic and Statistical Features of Internal Solitary Waves on the Continental Slope in the Northern South China Sea Derived From Mooring Observations

et al. 2019

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“…Moreover, the closer the mode-2 ISW is to the step in the vertical direction at the time of incidence, the smaller the propagation speed and amplitude of the mode-2 ISW are after passing the step. Kurkina et al (2017) used the Generalized Digital Environmental Model (GDEM) to find that seawater depth in the South China Sea is the main controlling factor of the mode-2 ISW propagation speed, and that the propagation speed increases exponentially with increasing seawater depth. Deepwell et al (2019) found by simulation that the relationship between the mode-2 ISW propagation speed and amplitude has a strong quadratic trend.…”

Section: Introductionmentioning

confidence: 99%

Regional study of mode-2 internal solitary waves at the Pacific coast of Central America using marine seismic survey data

Fan

Song

Gong

et al. 2022

Nonlin. Processes Geophys.

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Abstract. In this paper, a regional study of mode-2 internal solitary waves (ISWs) at the Pacific coast of Central America is carried out using the seismic reflection method. The observed relationship between the dimensionless propagation speed and the dimensionless amplitude (DA) of the mode-2 ISW is analyzed. When DA < 1.18, the dimensionless propagation speed seems to increase with increasing DA, divided into two parts with different growth rates. When DA > 1.18, the dimensionless propagation speed increases with increasing DA at a relatively small growth rate. We suggest that the influences of seawater depth (submarine topography), pycnocline depth, and pycnocline thickness on the propagation speed of the mode-2 ISW in the study area cause the relationship between dimensionless propagation speed and DA to diversify. The observed relationship between the dimensionless wavelength and the DA of the mode-2 ISW is also analyzed. When DA < 1, the nondimensional wavelengths seem to change from 2.5 to 7 for a fixed nondimensional amplitude. When DA > 1.87, the dimensionless wavelength increases with increasing DA. Additionally, the seawater depth has a great influence on the wavelength of the mode-2 ISW in the study area. Overall, the wavelength increases with increasing seawater depth. As for the vertical structure of the amplitude of the mode-2 ISW in the study area, we find that it is affected by the nonlinearity of the ISW and the pycnocline deviation (especially the downward pycnocline deviation).

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Internal Wave Breathers in the Slightly Stratified Fluid

Talipova

Kurkina

Kurkin

et al. 2019

Microgravity Sci. Technol.

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Kinematic parameters of internal waves of the second mode in the South China Sea

Cited by 10 publications

References 43 publications

Dynamic and Statistical Features of Internal Solitary Waves on the Continental Slope in the Northern South China Sea Derived From Mooring Observations

Dynamic and Statistical Features of Internal Solitary Waves on the Continental Slope in the Northern South China Sea Derived From Mooring Observations

Regional study of mode-2 internal solitary waves at the Pacific coast of Central America using marine seismic survey data

Internal Wave Breathers in the Slightly Stratified Fluid

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