南海海山地下深层亚中尺度过程的动力机制与能量串级

亚中尺度动力过程是海洋中尺度向小尺度能量正向串级的一个关键动力过程，海山等突变地形下近底层是除上混合层外，亚中尺度动力过程活跃的另一个关键区域。前人的研究表明南海复杂地形下深层强混合是内潮内波能量耗散所致，对于突变地形（尤其是海山地形）下深层亚中尺度在其中的作用尚不清楚。本研究拟利用观测资料、数值模拟与敏感性实验、诊断分析等方法，聚焦南海海山地形，研究突变地形下南海深层亚中尺度动力过程的时空特征与产生机制，并探讨其能量串级，从而揭示在海山地形下深层亚中尺度动力过程对局地混合以及对深海环流变异的作用。

The submesoscale process in the ocean is a key dynamic process in which the mesoscale energy is cascaded to the small scale. Except for the upper mixing layer, the well developed bottom mixing layer around the abrupt topography (such as seamounts) is another key area where the submesoscale processes are active. Previous studies have shown that the intensified mixing in the complex topography of the South China Sea (SCS) is caused by the energy dissipation of internal tide and/or internal waves. The role submesoscale in deep layer in the abrupt topography (especially Seamount Topography) is not clear. Based on in-situ data, numerical simulation and dynamical diagnostic analysis, this study is to study the spatial-temporal characteristics, generation mechanisms and the energy cascade of the deep submesoscale processes around the seamount area in the SCS. And then we are to reveal the role of the deep submesoscale processes in the local mixing and in the variability of the deep sea circulation around the seamount area in the SCS.