Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer
	Li Guojing; Wang Dongxiao; Chen Ju; Yao Jinglong; Zeng Lili; Shu Yeqiang; Sui Dandan
刊名	ACTA OCEANOLOGICA SINICA
	2015
卷号	34 期号:5 页码:1-11
关键词	surface mixed layer Langmuir circulation shear turbulence large eddy simulation
通讯作者	yaojl@scsio.ac.cn
中文摘要	Large eddy simulation (LES) is used to investigate contrasting dynamic characteristics of shear turbulence (ST) and Langmuir circulation (LC) in the surface mixed layer (SML). ST is usually induced by wind forcing in SML. LC can be driven by wave-current interaction that includes the roles of wind, wave and vortex forcing. The LES results show that LC suppresses the horizontal velocity and greatly modifies the downwind velocity profile, but increases the vertical velocity. The strong downwelling jets of LC accelerate and increase the downward transport of energy as compared to ST. The vertical eddy viscosity K-m of LC is much larger than that of ST. Strong mixing induced by LC has two locations. They are located in the 2 delta(s)-3 delta(s) (Stokes depth scale) and the lower layer of the SML, respectively. Its value and position change periodically with time. In contrast, maximum K-m induced by ST is located in the middle depth of the SML. The turbulent kinetic energy (TKE) generated by LC is larger than that by ST. The differences in vertical distributions of TKE and K-m are evident. Therefore, the parameterization of LC cannot be solely based on TKE. For deep SML, the convection of large-scale eddies in LC plays a main role in downward transport of energy and LC can induce stronger velocity shear (S-2) near the SML base. In addition, the large-scale eddies and S-2 induced by LC is changing all the time, which needs to be fully considered in the parameterization of LC.
学科主题	Oceanography
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/14975]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Li Guojing,Wang Dongxiao,Chen Ju,et al. Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer[J]. ACTA OCEANOLOGICA SINICA,2015,34(5):1-11.
APA	Li Guojing.,Wang Dongxiao.,Chen Ju.,Yao Jinglong.,Zeng Lili.,...&Sui Dandan.(2015).Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer.ACTA OCEANOLOGICA SINICA,34(5),1-11.
MLA	Li Guojing,et al."Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer".ACTA OCEANOLOGICA SINICA 34.5(2015):1-11.