南海北部海水垂向层化结构的季节性变化对内孤立波的影响

卫星图象和观测资料显示南海北部内孤立波存在着明显的季节性变化。基于对实测资料和卫星遥感资料的分析，本项目拟通过建立一个连续分层非静力内孤立波数值模式研究海水垂向层化结构的季节变化对南海北部内孤立波的影响。首先，从观测和卫星资料中提取海水垂向层化结构以及内孤立波的特征信息并对它们的季节相关性进行分析；其次，建立连续分层非静力的内孤立波数值模式，以不同季节海水层结为背景在南海北部多个剖面驱动模式，并以实测内孤立波资料为参考调试并验证模式，进一步研究海水层化垂向结构季节变化对内孤立波生成、传播和演变特征的影响；最后，分析海水垂向层化结构的季节变化如何影响正压能向内孤立波斜压能的转化，揭示南海北部内孤立波斜压能的转化率以及内孤立波斜压能量分配的变化特征。. 通过本项研究可加深对南海北部内孤立波时空变化规律及生成、传播和演变规律的认识。

Satellite images and observations show that the internal solitary waves in the northern South China Sea have an obvious seasonal variation. Through the establishment of a continuously stratified nonhydrostatic internal solitary wave numerical model based on the analysis of the measured data and satellite remote sensing data, we wish to study the effect of the seasonal variation of seawater vertical stratification structure on internal solitary waves in the northern South China Sea. First of all, we will extract the characteristic information of the seawater vertical stratification structure and the internal solitary waves from the observations and satellite data and study the seasonal correlation between them. Secondly, we will establish the continuously stratified nonhydrostatic internal solitary wave numerical model. The numerical model will be run with different seasonal seawater stratification in several sections in northern South China Sea and it will be debuggeg and verified by the observed internal solitary wave data. Based on the numerical model,we further study the effect of the seasonal variation of seawater vertical stratification structure on the generation, propagation and evolution of the internal solitary waves in the northern South China Sea. Finally, we study how does the seasonal variation of seawater vertical stratification structure affect the energy conversion from barotropic tide to internal solitary waves and reveal the baroclinic energy conversion rate and partition of the baroclinic energy of internal solitary waves.. The study can deepen the understanding of the law of the spatial and temporal variation of the internal solitary waves in the northern South China Sea and the law of its generation, propagation and evolution.