南海西北陆坡区内潮与近惯性内波观测研究

发布时间：2018-05-19 15:27

本文选题：南海 + 内潮　；参考：《海洋学报》2016年11期

【摘要】：通过对2006年南海西北部海域近3个月的全水深流速观测资料的分析,研究了该海区正压潮、内潮及近惯性内波的时空分布特征。结果表明,全日内潮明显强于半日内潮,且最大潮流均出现在海洋上层;内潮的主轴方向基本沿东南-西北方向,近似与局地等深线垂直;内潮能量显示出明显的时间长度约为半月的大小潮调制周期;全日内潮的coherent部分占全日内潮能量的70%,而半日内潮的coherent部分占半日内潮能量的53%;进一步研究发现半日内潮主要由第一模态主导,而全日内潮第三模态能量占总能量的比例仅次于第一模态且量值上与之相当;强风过程可激发出强的近惯性运动,暖涡使得近惯性内波能量更有效地向海洋深层传播,冷涡则不利于近惯性内波能量向下传播。
[Abstract]:The temporal and spatial distribution characteristics of barotropic tide, internal tide and near-inertial internal wave in the northwestern South China Sea during the past three months were studied by analyzing the observation data of total depth velocities in the northwestern South China Sea in 2006. The results show that the whole diurnal tide is obviously stronger than the half-diurnal tide, and the maximum tidal current appears in the upper ocean layer, and the principal axis of the inner tide is approximately perpendicular to the local isobath along the direction of southeast to northwest. The internal tide energy shows that the apparent time length is about half a month's large or small tidal modulation period. The coherent part of the whole day tide accounts for 70% of the whole day tide energy, while the coherent part of the half-day tide accounts for 53% of the half-day tide energy. Further study shows that the semidiurnal tide is dominated by the first mode. The ratio of the third mode energy to the total energy in the whole day is second only to that of the first mode and is equivalent to that of the first mode. The strong wind process can stimulate strong near-inertial motion, and the warm vortex causes the near-inertial wave energy to propagate more effectively to the deep ocean. The cold vortex is not conducive to the downward propagation of internal wave energy near inertia.
【作者单位】：中国海洋大学物理海洋教育部重点实验室;
【基金】：南海关键岛屿周边多尺度海洋动力过程研究(2014CB745003) 南海海洋环流形成变异机理及其气候效应(GASI-03-01-01-03) 内波与混合精细化观测系统集成与示范(2013AA09A502) 国家自然科学基金—吕宋海峡深层环流的调控机制及影响因素(41176010)
【分类号】：P731.2

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