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Evolution of Staircase Structures in Diffusive Convection
Guo, Shuang-Xi; Zhou, Sheng-Qi; Cen, Xian-Rong; Lu, Yuan-Zheng
2018
Source PublicationJOVE-JOURNAL OF VISUALIZED EXPERIMENTS
ISSN1940-087X
Issue139Pages:e58316
AbstractDiffusive 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.
DepartmentLTO
KeywordEnvironmental Sciences Issue 139 Stratified Fluid Diffusive Convection Staircase Structure Shadowgraph Technique Convecting Layer Interface
DOI10.3791/58316
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17795
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.[Guo, Shuang-Xi
2.Zhou, Sheng-Qi
3.Cen, Xian-Rong
4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Guo, Shuang-Xi,Zhou, Sheng-Qi,Cen, Xian-Rong,et al. Evolution of Staircase Structures in Diffusive Convection[J]. JOVE-JOURNAL OF VISUALIZED EXPERIMENTS,2018(139):e58316.
APA Guo, Shuang-Xi,Zhou, Sheng-Qi,Cen, Xian-Rong,&Lu, Yuan-Zheng.(2018).Evolution of Staircase Structures in Diffusive Convection.JOVE-JOURNAL OF VISUALIZED EXPERIMENTS(139),e58316.
MLA Guo, Shuang-Xi,et al."Evolution of Staircase Structures in Diffusive Convection".JOVE-JOURNAL OF VISUALIZED EXPERIMENTS .139(2018):e58316.
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