海洋行星波动对南印度洋中层条带状流的作用

旋转星体的流体运动中普遍存在条带状流动结构，这是地转湍动不稳定下存在的一种特殊流场结构，扰动能量通过各项异性的反向串级传递到平均流上，条带状结构对于海洋中能量及物质的传递起到了重要的作用。表层海流在大尺度风场作用下通常表现为大尺度环流圈结构，而条带状流动往往在中深层更明显。南热带印度洋具有独特的季风以及海陆分布，探究其条带状结构的特征有助于提升我们对海洋中深层环流的认识。海洋行星波动对于中深层流场条带状结构的生成和变异起到了关键作用，讨论其生成机制及不同源区的波动过程对其的调制，能够完善条带状流生成及变异的理论。本项目将通过实测数据分析南印度洋的中层条带状流结构特征，利用高分辨率模式数据诊断其可能的生成及变异机制，通过约化重力模式敏感性实验，探讨南印度洋中层流场条带状结构的变异与动力机制。本项目的开展有助于提升对中深层环流结构的理解，也能够加深中深层海洋动力及能量平衡的认识。

Striation-like jets are found in the rotating planet, which are forced by the geostrophic turbulence. The mid-scale energy is transferred to the mean flow through the anisotropic inverse cascade. The striation-like jet plays an important role in exploring the transfer of energy and water mass in the ocean. The large-scale surface circulation is driven by the large scale wind stress, while the striation-like structure is more obvious in the midddepth. The southern tropical Indian Ocean has a unique monsoon and topography. Exploring the characteristics of striation-like structure is helpful to improve the understanding of the circulation in deep ocean. The ocean wave plays a key role in the generation and variation of the middepth striations. The generation mechanism of the striations may interact with ocean waves from different source regions. This project aim to show the characteristics and dynamic mechanism of the middepth striation in the South Indian Ocean based on the observation, the high-resolution model data, and explore the variation and dynamic mechanism of the striations through sensitivity experiments based on the reduced gravity model. The implementation of this project can be supportive to enrich our understandings regarding the middepth circulation structure, and also deepen the understanding of the energy balance in the middepth.