Abstract The present study focuses on the dynamics of M2 internal tides on the shelf and slope off the west coast of India (WCI) using a high-resolution (1/48∘) numerical ocean circulation model configured for the eastern Arabian Sea. The WCI is characterized by the presence of large internal tides where most of the internal tides generated on shelf-slope regions propagate offshore as beams. Baroclinic energy budget estimates show that about 2.4 GW of barotropic tides gets converted to baroclinic tides over the region. The regions of shelf breaks and upper slope around 16–18.5∘ N and the northern part of the Chagos-Laccadive Ridge (8–14∘ N) are the two most important regions of internal tide generation along the WCI, which together contribute to more than 50% of total area-integrated M2 conversion over the domain. The diapycnal diffusivity for internal tide dissipation exceeds 10−3m/2s in these regions. The central and northern slope regions off the WCI are dominated by locally generated internal tides, whereas part of internal tides in the southern region is characterized by the presence of remotely-generated internal tides coming from the Chagos-Laccadive Islands. Internal tides experience significant seasonal variation on the shelf owing to the variation in stratification, while their variations are negligible on the slope, where the seasonal variation in stratification is not significant.

中文翻译：

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印度西海岸大陆架和斜坡内部潮汐的产生、传播和消散

摘要 本研究的重点是使用为阿拉伯海东部配置的高分辨率 (1/48∘) 数值海洋环流模型，研究印度西海岸 (WCI) 大陆架和斜坡上 M2 内部潮汐的动力学。WCI 的特点是存在大的内部潮汐，其中大部分在陆架斜坡区域产生的内部潮汐以梁的形式在海上传播。斜压能量预算估计表明，该地区约有 2.4 GW 的正压潮汐转化为斜压潮汐。16-18.5∘N 附近的陆架断裂和上坡区和查戈斯-拉卡迪夫海脊北部（8-14∘ N）是 WCI 沿线两个最重要的内部潮汐生成区，它们共同贡献了更多超过域上总面积积分 M2 转换的 50%。在这些地区，内部潮汐消散的渗流扩散率超过 10-3m/2s。WCI 的中部和北部斜坡地区以局部产生的内部潮汐为主，而南部地区的部分内部潮汐则以存在来自查戈斯-拉卡代夫群岛的远程内部潮汐为特征。由于分层的变化，陆架内部潮汐经历了显着的季节性变化，而它们在斜坡上的变化可以忽略不计，分层的季节性变化不显着。而南部地区部分内部潮汐的特点是存在来自查戈斯-拉卡代夫群岛的远程产生的内部潮汐。由于分层的变化，陆架内部潮汐经历了显着的季节性变化，而它们在斜坡上的变化可以忽略不计，分层的季节性变化不显着。而南部地区部分内部潮汐的特点是存在来自查戈斯-拉卡代夫群岛的远程产生的内部潮汐。由于分层的变化，陆架内部潮汐经历了显着的季节性变化，而它们在斜坡上的变化可以忽略不计，分层的季节性变化不显着。