西沙群岛西北深水海域的内潮特征分析

发布时间：2018-04-16 07:31

本文选题：南海西北部 + 西沙　；参考：《地球物理学报》2016年07期

【摘要】：基于海南岛至西沙群岛之间深水海域一长达5年的锚定潜标测流资料,采用谱分析、调和分析和动力模态分解等方法主要分析了局部海域内潮的基本特征.结果表明:研究海域的正压和斜压潮均以全日振荡为主,500~900m的海洋中层全日等密度线垂向振幅可达40m;全日内潮主要沿垂直于陆坡方向传播,与天文潮锁相的全日内潮可占全日内潮总能量的41%;海洋上层,O1内潮垂向平均振幅与局地海面高度呈显著正相关关系,K1内潮则表现为夏、冬季增强的半年循环特征;超过70%的O1分潮能量集中于第一、二斜压模态上,K1分潮在第三斜压模态上亦有相当能量.
[Abstract]:Based on the current measurement data of a 5-year anchored submarine survey in the deep water area between Hainan Island and Xisha Islands, the basic characteristics of the internal tide in the local sea area are mainly analyzed by means of spectral analysis, harmonic analysis and dynamic mode decomposition.The results show that the vertical amplitude of isodyne isodyne line in the middle of the sea is 40 m, and the whole day tide propagates mainly perpendicular to the continental slope, and the vertical amplitude of the isodyne isodyne line in the middle layer of the sea is up to 40 m, which is dominated by the oscillation of the whole day and baroclinic tide.The whole diurnal tide with astronomical tide locked phase can account for 41% of the total energy of the whole day tide, and the vertical mean amplitude of O1 tide in the upper ocean has a significant positive correlation with the local sea surface height. The K1 internal tide shows the characteristics of summer and half a year cycle enhanced in winter.More than 70% of the O1 tidal energy is concentrated in the first one, and the K1 component has considerable energy in the third baroclinic mode.
【作者单位】：中国科学院南海海洋研究所热带海洋环境国家重点实验室;中国科学院大学;
【基金】：中国科学院知识创新项目(KZCX2-EW-204) 国家自然科学基金(U1033003,41276022) 热带海洋环境国家重点实验室自主研究项目(LTOZZ1502)联合资助
【分类号】：P731.23

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