Spatial variation and parameterization model of upper turbulent mixing in the central South China Sea

Zhou Yu; Chen Guiying; Shang Xiaodong; Liang Changrong

doi:10.3969/j.issn.0253-4193.2015.05.003

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Zhou Yu, Chen Guiying, Shang Xiaodong, Liang Changrong. Spatial variation and parameterization model of upper turbulent mixing in the central South China Sea[J]. Haiyang Xuebao, 2015, 37(5): 24-33. doi: 10.3969/j.issn.0253-4193.2015.05.003

Citation:

Zhou Yu, Chen Guiying, Shang Xiaodong, Liang Changrong. Spatial variation and parameterization model of upper turbulent mixing in the central South China Sea[J]. Haiyang Xuebao, 2015, 37(5): 24-33. doi: 10.3969/j.issn.0253-4193.2015.05.003

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Spatial variation and parameterization model of upper turbulent mixing in the central South China Sea

doi: 10.3969/j.issn.0253-4193.2015.05.003

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2014-07-08
Rev Recd Date: 2015-01-20

Abstract

Abstract

Turbulent microstructure data in sections of 16°N and 14.5°N in May 2010 has been analyzed. The spatial variation of upper turbulent mixing in central South China Sea is investigated. The results show that,in the upper 10 to 400 m layer of 16°N section,the averaged vertical dissipation rate of turbulent kinetic energy <ερ> in the eastern sites is slightly stronger than that in the western sites. On the contrary,in 14.5°N section,it is found that <ε_ρ> in western sites is 4 times of eastern sites; <ερ> declines from a averaged value of 2.6×10^-6 W/m³ in the western sites (110.5°E to 111°E) to 5.89×10^-7 W/m³ in the eastern sites (118.5°E). It is found that strong fine structure current shear and <ερ> are well correlated,which suggests that the strong current shear may be the main driving force for the strong turbulent mixing. Further study has revealed that the internal wave breaking of higher mode may be the main mechanism of turbulent mixing. In addition,three kinds of parameterization models are examined. MacKinnon-Gregg (MG) model for coastal sea is preferable because that the model could estimate turbulence dissipation rate of the upper layer of the central South China Sea with buoyancy frequency and shear.
- turbulent dissipation rate,
- South China Sea,
- spatial variation,
- parameterization model

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