粤东上升流是南海北部一个非常重要的物理过程。以往研究多关注夏季风盛行条件下的粤东上升流的特征及动力过程，对于秋初夏季风撤退期不利于上升流的风场持续较长时间后上升流依然存在的现象较少关注，其动力机制尚不清楚。本研究拟利用粤东外海观测资料、理论分析以及数值模拟与诊断等方法，以秋初夏季风撤退期粤东地形与变化的背景流场相互作用过程为切入点，研究背景流场变化下的底Ekman层浮力捕获动力过程，分析不同背景流场下的粤东地形诱导上升流的空间分布及主要动力控制因子，从而系统揭示背景流连续变化下的粤东上升流时空演变规律。

Yuedong upwelling is a very important physical process in the northern South China Sea. Previous studies on Yuedong upwelling mainly focused on the summer period when the southwestly wind prevails. So far, there are very few studies dealing with the upwelling during the summer monsoon retreat when prevailing wind is upwelling unfavorable, and the corresponding dynamic mechanism remains unclear. This study aims to investigate the interaction between Yuedong topography and variable background current during the summer monsson retreat using in-situ data, theoretical analysis and numerical simulation. By this study, we can understand the response of the bottom Ekman dynamic processes and Yuedong topographically-induced upwelling to the time-variable back current, and find out the dynamic controlling factors. Moreover, we hope to reveal the spatial-temporal evolution of topographically-induced upwelling with the time-variable background current during summer moonson retreat in the Yuedong area.