Evolution of Staircase Structures in Diffusive Convection

doi:10.3791/58316

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)

	Evolution of Staircase Structures in Diffusive Convection
	Cen, Xian-Rong ; Guo, Shuang-Xi ; Zhou, Sheng-Qi ; Lu, Yuan-Zheng
刊名	JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
	2018
期号	139 页码:e58316
关键词	Environmental Sciences Issue 139 Stratified Fluid Diffusive Convection Staircase Structure Shadowgraph Technique Convecting Layer Interface
ISSN号	1940-087X
DOI	10.3791/58316
英文摘要	Diffusive convection (DC) occurs when the vertical stratified density is controlled by two opposing scalar gradients that have distinctly different molecular diffusivities, and the larger- and smaller-diffusivity scalar gradients have negative and positive contributions for the density distribution, respectively. The DC occurs in many natural processes and engineering applications, for example, oceanography, astrophysics and metallurgy. In oceans, one of the most remarkable features of DC is that the vertical temperature and salinity profiles are staircase-like structure, composed of consecutive steps with thick homogeneous convecting layers and relatively thin and high-gradient interfaces. The DC staircases have been observed in many oceans, especially in the Arctic and Antarctic Oceans, and play an important role on the ocean circulation and climatic change. In the Arctic Ocean, there exist basin-wide and persistent DC staircases in the upper and deep oceans. The DC process has an important effect on diapycnal mixing in the upper ocean and may significantly influence the surface ice-melting. Compared to the limitations of field observations, laboratory experiment shows its unique advantage to effectively examine the dynamic and thermodynamic processes in DC, because the boundary conditions and the controlled parameters can be strictly adjusted. Here, a detailed protocol is described to simulate the evolution process of DC staircase structure, including its generation, development and disappearance, in a rectangular tank filled with stratified saline water. The experimental setup, evolution process, data analysis, and discussion of results are described in detail.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17795]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Beijing, Peoples R China 2.Cen, Xian-Rong 3.Zhou, Sheng-Qi 4.[Guo, Shuang-Xi
推荐引用方式 GB/T 7714	Cen, Xian-Rong,Guo, Shuang-Xi,Zhou, Sheng-Qi,et al. Evolution of Staircase Structures in Diffusive Convection[J]. JOVE-JOURNAL OF VISUALIZED EXPERIMENTS,2018(139):e58316.
APA	Cen, Xian-Rong,Guo, Shuang-Xi,Zhou, Sheng-Qi,&Lu, Yuan-Zheng.(2018).Evolution of Staircase Structures in Diffusive Convection.JOVE-JOURNAL OF VISUALIZED EXPERIMENTS(139),e58316.
MLA	Cen, Xian-Rong,et al."Evolution of Staircase Structures in Diffusive Convection".JOVE-JOURNAL OF VISUALIZED EXPERIMENTS .139(2018):e58316.