太平洋不同海水层结条件下的内波波致声场起伏研究

基于Argo资料对太平洋海域海水层结进行分类区划,利用内波动力学方法对内波致声起伏进行数值求解,对不同层结状况下的内波致声起伏进行模拟试验。结果表明:垂直方向海水层结的不均匀和跃层的存在,使海洋内波斜压模态受到了歪曲变形。层结峰的个数和深度与声速起伏存在很好的对应关系。有内波的声传播特征总体上与没有内波时的相似。不同层结情况下,声场对内波扰动的响应不一致。

Sound fluctuation caused by the internal wave under different stratified conditions in the Pacific

The stratified conditions of seawater in the Pacific were analyzed and classified based on Argo data. Using internal wave dynamics method, the numerical value of the sound fluctuation caused by the internal wave was solved,and the sound fluctuations in different stratified conditions of seawater were simulated and analyzed. The results show that the vertical mode shape is distorted because of the nonhomogeneous density of seawater and the existence of the pycnocline,and the distortion corresponds to the intensity of pycnocline. And the number and the depths of stratification apexes have good corresponding relationships with the sound fluctuations. In general, sound transmission characteristics with internal wave are similar to the transmission characteristics without internal wave. However, acoustic field responses to the disturbance of internal wave under different stratified conditions are diverse.