Numerical simulation of internal tides seasonal variations in the deep northern South China Sea

Zhang Xiaojiang; Sun Hui; Ji Chengzhen

doi:10.3969/j.issn.0253-4193.2018.01.002

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Zhang Xiaojiang, Sun Hui, Ji Chengzhen. Numerical simulation of internal tides seasonal variations in the deep northern South China Sea[J]. Haiyang Xuebao, 2018, 40(1): 10-16. doi: 10.3969/j.issn.0253-4193.2018.01.002

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Zhang Xiaojiang, Sun Hui, Ji Chengzhen. Numerical simulation of internal tides seasonal variations in the deep northern South China Sea[J]. Haiyang Xuebao, 2018, 40(1): 10-16. doi: 10.3969/j.issn.0253-4193.2018.01.002

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Numerical simulation of internal tides seasonal variations in the deep northern South China Sea

doi: 10.3969/j.issn.0253-4193.2018.01.002

1.
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
2.
North China Sea Marine Forecasting Center of Oceanic Administration, Qingdao 266061, China

Received Date: 2017-03-10

Abstract

Abstract

Based on the Massachusetts Institute of Technology General Circulation Model, the numerical simulation of the internal tide in the northern South China Sea (SCS) is carried out by using the actual bathymetry, stratification and tidal current force. The differences of the internal tide in the northern South China Sea during the two seasons are analyzed. The results show that the velocity in the K₁ and M₂ is 10.1% and 44.7% stronger than that in the summer. The results of the vertical modal analysis show that although the tidal kinetic energy density in the first modal is 15.5% lower in winter than that in summer, the second and third modal tides are about 25.1% and 33.2% higher. These high-mode tides may lead to intense vertical shear in the deep basin of SCS in winter, indicating that the stronger high-mode tide may be one of the reasons for the intense mixing of the deep SCS in winter.
- mode simulation,
- internal tide,
- seasonal variation,
- modal analysis

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References(19)

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