琼东陆架陆坡区内潮混合及与上升流的相互作用

The continental shelf and slop east of Hainan Island is an area typically characterized by the dramatically topographic variation, with a depth transition from tens of meters to thousands of meters, shifting between subcritical-, critical- and supercritical slopes. It is complexly influential to internal tide’s propagation. The propagation, break and dissipation of internal tides are regarded as one significant type of mechanism for turbulent mixing on the shelf and slope. The existence of Qiongdong upwelling and its interaction with internal tides make the dynamic process more complicated here. Therefore, analyzing the character of internal tides and its impact to turbulent mixing and investigating the interaction between internal tides and Qiongdong upwelling are essential for understanding internal tide induced mixing, local circulation and their mutual effects systematically..This program will focus on the issues of the internal tide, induced mixing and their relationship with Qiongdong upwelling based on field observation and preliminary laboratory experiments, aiming to: i) depict the structure, variation, propagation and dissipation of internal tides; ii) elucidate the mechanism of internal tide induced mixing; iii) clarify the interaction between internal tide induced mixing and Qiongdong upwelling in this region.

琼东陆架陆坡区是典型的底地形变化较剧烈的区域，水深在几十公里范围内从几十米的陆架浅海区过渡到上千米的深水区，并在亚临界、临界和超临界地形之间变换，可能导致内潮呈现复杂的传播特征。内潮波的传播、破碎和耗散被认为是陆架陆坡区湍流混合的重要机制之一，而琼东上升流和内潮之间的相互作用使得该海区的动力过程变得更为复杂。因此，开展琼东陆架陆坡区内潮特征及对混合的影响研究，探究内潮和上升流之间的相互作用，对于深入系统地了解该海区内潮混合过程及与环流的关系至关重要。.本课题将针对琼东陆架陆坡区内潮混合及其与琼东上升流关系，拟利用现场观测，并结合初步的实验室实验，刻画该海区内潮基本特征及传播与耗散过程，揭示琼东陆架陆坡区内潮混合机制，阐明该海区内潮混合和琼东上升流之间的相互作用。

琼东陆架陆坡区是典型的底地形变化较为剧烈的区域。受底地形的影响，该海区的内潮呈现复杂的变化特征。内潮波的传播和破碎被认为是陆架陆坡区湍流混合过程的重要机制之一，夏季琼东上升流的存在使得内潮特征及对混合的影响变的更为复杂。.本课题针对上述现象，利用多源数据（航次观测连续站数据、海床基数据、以及潜标数据）给出了琼东海域潮流尤其内潮的特征及变化；利用微结构观测数据给出了琼东海域混合过程变化特征，并分析了其他动力过程如内潮和上升流的可能影响；利用多年卫星资料分析了琼东上升流的长期变化及影响因素，并利用潜标阵列数据对比分析了楚科奇海陆架陆坡区的上升流特征及大气强迫的可能影响，对于陆架陆坡区内潮、混合、及其与上升流的相互影响等过程的研究有重要意义 。