Observations of the turbulent kinetic energy dissipation rate in the upper central South China Sea
Liang, CR; Chen, GY; Shang, XD; xdshang@scsio.ac.cn
2017
发表期刊OCEAN DYNAMICS
卷号67期号:5页码:597-609
摘要Measurements of the turbulent kinetic energy dissipation rate (epsilon), velocity, temperature, and salinity were obtained for the upper ocean of the central South China Sea (14.5A degrees N, 117.0A degrees E) during an experimental campaign from May 11 to 13, 2010. Dissipation in the diurnal mixed layer showed a diurnal variability that was strongly affected by the surface buoyancy flux. Dissipation was enhanced (epsilon similar to 10(-7) W kg(-1)) at night due to the convective mixing and was weakened (epsilon similar to 10(-9) W kg(-1)) in daytime due to the stratification. Dissipation in the thermocline varied with time under the influence of internal waves. Shear from high-frequency internal waves (period similar to 8 h) played an important role in enhancing the turbulent mixing in the thermocline. In the period of strong high-frequency internal waves, the shear from high-frequency internal waves became strong and the depth-averaged epsilon in the thermocline was elevated by almost one order of magnitude. Compared with the dissipation in the thermocline, dissipation below was weaker (the time-averaged epsilon similar to 10(-10) W kg(-1)). The observation indicates that the dissipation rates during the measurements can be parameterized by the MacKinnon-Gregg model that is widely used in the continental shelf but are not in agreement with the Gregg-Henyey model used for the open ocean.
部门归属[Liang, Chang-Rong; Chen, Gui-Ying; Shang, Xiao-Dong] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Liang, Chang-Rong] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词Dissipation Rate Surface Buoyancy Flux Internal Wave Parameterization
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16447
专题热带海洋环境国家重点实验室(LTO)
通讯作者xdshang@scsio.ac.cn
推荐引用方式
GB/T 7714
Liang, CR,Chen, GY,Shang, XD,et al. Observations of the turbulent kinetic energy dissipation rate in the upper central South China Sea[J]. OCEAN DYNAMICS,2017,67(5):597-609.
APA Liang, CR,Chen, GY,Shang, XD,&xdshang@scsio.ac.cn.(2017).Observations of the turbulent kinetic energy dissipation rate in the upper central South China Sea.OCEAN DYNAMICS,67(5),597-609.
MLA Liang, CR,et al."Observations of the turbulent kinetic energy dissipation rate in the upper central South China Sea".OCEAN DYNAMICS 67.5(2017):597-609.
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