Effect of the vertical stratification on the characteristics and energy of internal solitary waves from a numerical model
A continuously stratified nonlinear numerical model is set up to study the impact of changes in the vertical stratification on the properties of internal solitary waves (ISWs) generated by tidal flow over a ridge.Based on modifications of the observed stratification with a secondary thermocline over a main one in the South China Sea,the generated ISW characteristics and energy conversion are studied.In general,the isopycnal undergoing maximum displacement in the ISWs is from slightly below the main thermocline.When the stratification below the ridge crest is reduced,the wave amplitude and the number of ISWs in a wave packet increase,while the wave half-width,the sum of the ISW kinetic energy (KE) and available potential energy (APE),and the ratio of ISW KE to APE decrease.When the stratification above the ridge crest is reduced,the ISW amplitude,the number of ISWs and the sum of KE and APE decrease,while the wave half-width and the ratio of KE to APE increase.If the main thermocline is over the secondary one,the ISW amplitude,the wave half-width,the sum of KE and APE and the ratio of KE to APE increase.If the thermocline is lowered,the wave amplitude,the wave half-width and the sum of the KE and APE increase,while the ratio of KE to APE decreases.In addition,the ratio of baroclinic to barotropic energy was found to be between 10% and 40%,and the ratio of ISW KE to APE is between about 1.30–1.65.It is also shown that the ratio of KE to APE for the stratifications with two thermoclines is about 2%–6% larger than that for the stratifications with only one thermocline.
internal solitary waves stratification numerical model baroclinic energy
Jieshuo Xie Jiexin Xu Zhiwu Chen Shuqun Cai
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
国际会议
The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)
杭州
英文
550-557
2013-04-23（万方平台首次上网日期，不代表论文的发表时间）