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学科主题: Oceanography
题名: Monthly variation of some parameters about internal solitary waves in the South China sea
作者: Cai, SQ ; Xie, JS ; Xu, JX ; Wang, DX ; Chen, ZW ; Deng, XD ; Long, XM
通讯作者: caisq@scsio.ac.cn
关键词: Nonlinear waves ; Internal solitary waves ; Non linearity ; Finite-depth theory ; Kortweg devries equation ; South China Sea
刊名: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
发表日期: 2014
卷: 84, 页:73-85
收录类别: sci
部门归属: [Cai, Shuqun ; Xie, Jieshuo ; Xu, Jiexin ; Wang, Dongxiao ; Chen, Zhiwu ; Deng, Xiaodong ; Long, Xiaomin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [Xie, Jieshuo ; Xu, Jiexin ; Deng, Xiaodong] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
项目归属: LTO
资助者: Special Fund of Strategic Leading Science and Technology from Chinese Academy of Sciences [XDA11020201]; National Basic Research Program [2013CB956101, 2011CB013701]; NSFC [41025019]; Knowledge Innovation Program of the Chinese Academy of Sciences [SQ201107]; Guangdong Natural Science Foundation [S2012040008082]
摘要: In this paper, by non-dimensional analysis, it is found that finite-depth theory is more appropriate to the study of internal solitary waves (ISWs) in the South China Sea (SCS) than shallow-water theory. The 1-degree grid data of monthly mean temperature and salinity data at standard levels in the SCS are used to solve the linearized vertical eigenvalue problem. The nonlinear parameter and the wave phase speed are computed, then the nonlinear phase speed and the characteristic half-width of ISWs are calculated respectively by two different theories to investigate the difference between these two parameters in the SCS. The nonlinearity is the strongest near the continental slope of the SCS or islands where the bottom topography changes sharply, it is stronger in summer than that in winter; it increases (decreases) as pycnocline depth deepens (shallows), stratification strengthens (weakens) and pycnocline thickness thins (thickens). The nonlinear wave phase speed and the characteristic half-width are the largest in deep sea area, they then reduce peripherally in shallower water. The nonlinear wave phase speed in the SCS changes slightly with time, but the characteristic half-width changes somewhat larger with time. In most of the SCS basin, the nonlinear wave phase speed derived from shallow-water theory is very close to that derived from finite-depth theory, but the characteristic half-width derived from shallow-water theory is about 0.2-0.6 times larger than that derived from finite-depth theory. The ISW induced horizontal current velocity derived from shallow-water theory is larger than that derived from finite-depth theory. Some observed and numerical modeled ISW characteristic half-widths are compared with those derived from shallow-water and finite-depth theories, respectively. It is shown that, the characteristic half-widths derived from finite-depth theory agree better with observational and numerical modeled results than those derived from shallow-water theory in most cases, finite-depth theory is more applicable to the estimation of ISW characteristic half-widths in the northern SCS. It is also suggested that, to derive the precise ISW parameters in further study, the physical non-dimensional ratios which are related with ISW characteristic half-width, amplitude, thermodine and water depths should be calculated, so that an appropriate theory can be chosen for estimation. (C) 2013 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000329960000007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10579
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Cai, SQ; Xie, JS; Xu, JX; Wang, DX; Chen, ZW; Deng, XD; Long, XM.Monthly variation of some parameters about internal solitary waves in the South China sea,DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2014,84():73-85
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