南海西部有着强烈的中尺度涡旋运动，尤其是南海西边界流地区是中尺度涡旋活动活跃区域之一。中尺度涡旋能够通过自身的水体和热盐输送等过程，对海表面高度和温跃层的变化产生直接影响。涡旋是如何通过改变海表面高度变化和跃层动力特征，从而影响南海西部环流动力学的机理尚不清楚。本项目将通过分析不同季节南海西部涡旋的中尺度变化特征和规律，深入认识涡旋热动量输运在南海西部环流调整过程中的作用。通过能量和动量收支，探讨不同涡旋强度下环流变化的时空特征，从而进一步揭示中尺度涡旋发展对南海西部环流的可能动力影响机理。

There are strong meso-scale eddies activity in the western South China Sea, and the western boundary current region in the South China Sea (SCS) is one of the most activity area of meso-scale eddies. The meso-scale can influence the sea surface height and the thermocline variability, by transferring the water, heat and salt fluxes et al. But the details of the dynamics mechanism, how about the eddy influence the western circulation in the SCS, by changing the sea surface height and thermocline are unclear. In this project, the meso-scale eddy variability in the western SCS will be further analyzed in different seasons, and the role of the heat and momentum flux transfer on western circulation in the SCS will be further recognized. From the heat and momentum budgets, we will focus on discussing the space-time variability of the western circulation with different eddy activity, and further reveal the possible dynamic influence mechanism of the meso-scale eddies development on the western circulation in the SCS.