热带气旋引起的南海次表层温度异常变化规律与机制研究

The impact of tropical cyclones (TCs) on the ocean is not confined to the ocean surface. The subsurface temperature anomalies induced by TCs can exist for months, which will inevitably influence the background oceanic state. However its mechanism has not been fully studied. On the other hand, South China Sea (SCS) is also a region with complicated oceanic current system and strongly affected by TCs. But the semi-closed geographical feature is favourable to tracking the subsurface signals. This proposal aims to study the subsurface temperature anomalies induced by TCs in SCS with sensitivity experiments using a high-resolution numerical model, and investigate the forms of motions of the subsurface temperature anomalies at the bottom of the mixed layer and thermocline, as well as the interactions with ambient water masses , meso-scale eddies, oceanic currents while moving. By answering these questions, we hope to gain more understandings of the detailed impact of TCs on SCS and their contributions to the entire tropical oceans and climate system.

热带气旋对海洋的影响不仅限于海表，它在海洋次表层形成的温度异常能维持几个月的时间，并对海洋环流产生重要影响，但是其运动学和动力学规律目前还了解不够深入。南海是热带气旋活跃的海区，具有复杂的海洋环流场，但是它半封闭的地形有利于次表层信号的追踪。本研究计划主要通过设计高分辨率区域海洋模式的敏感实验，研究南海次表层温度结构对于热带气旋的响应。着重探究热带气旋所造成的混合层底和温跃层的温度异常在海洋内部的运动形式，并研究这些信号在传播过程中与周围水体，中尺度涡与大尺度环流的相互作用及其机制。通过这些分析，以期更进一步了解热带气旋对南海影响的细节。最终帮助理解热带气旋对整个热带海区以及气候的贡献。