Energetics of Semidiurnal Internal Tides near Madagascar in the Southwest Indian Ocean
Energetics of Semidiurnal Internal Tides near Madagascar in the Southwest Indian Ocean
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DOI：
10.1016/j.pocean.2023.102972
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发表时间：
2023-01
影响因子：
4.1
通讯作者：
Hua Zhang;Yu‐Kun Qian;Xixi Wen;S. Peng
中科院分区：
文献类型：
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作者：
Hua Zhang;Yu‐Kun Qian;Xixi Wen;S. Peng
通过数值模拟，分析了西南印度洋马达加斯加岛附近半日内潮的能量特征。斜压能量收支表明，马达加斯加岛北部（NMI）和南部（SMI）辐射的内潮，特别是来自大陆坡的内潮，是周边深海斜压能量耗散的主要能量来源。在NMI和SMI，最强的斜压能量耗散和内潮诱导的底辟混合发生在脊和海山附近，深度积分能量耗散为0（10-1-100）W·m−2，O的耗散率（10-7-10-6）W·kg-1和O的径向扩散系数（10-3-10-2）m2·s−1，比莫桑比克海峡200米等深线附近大部分区域的大一个数量级。这些估计的基础上的数值模拟与以前的结果的基础上的微结构测量或细尺度参数化，并建议远程生成的内潮在深海斜压能量耗散中发挥了重要作用。
The semi-diurnal internal tidal energetics near Madagascar Island in the Southwest Indian Ocean were analyzed based on a numerical simulation. The baroclinic energy budget revealed that internal tides radiating from the north of Madagascar Island (NMI) and the south of Madagascar Island (SMI), especially those from the continental slope, were the dominant energy sources of the baroclinic energy dissipation in the deep ocean of surrounding areas. In NMI and SMI, the most intense baroclinic energy dissipation and internal tide-induced diapycnal mixing occurred near ridges and seamounts, with depth-integrated energy dissipation ofO(10-1-100) W·m−2, dissipation rates ofO(10-7-10-6) W·kg−1and diapycnal diffusivity ofO(10-3-10-2) m2·s−1, about one order of magnitude larger than those in most areas of the Mozambique Channel near the 200-m isobath. These estimates based on the numerical simulation were comparable with previous results based on microstructure measurements or fine-scale parameterizations, and suggested that the remotely generated internal tides played an important role in the baroclinic energy dissipation in the deep ocean.