南海上混合层作为联系大气底边界层和南海深层水域的中间层,调节着南海海-气通量。本研究采用资料分析、观测与大涡模拟模式相结合，对于南海典型区域与上层层结情况下，研究朗缪尔环流诱导的湍流混合物理过程及其非线性动力机制。系统探究朗缪尔环流诱导的挟卷速度、挟卷通量、冷热水升降物理过程与垂向涡粘系数的演变特征，并量化分析相应的湍动能收支、动量通量、压强、速度场和速度剪切及其变化特征，揭示相应湍流混合物理过程与非线性动力机制的异同性。构建朗缪尔环流诱导南海上混合层湍流混合物理过程与非线性动力机制特征的时空变化分布图。

The surface mixed layer (SML) of the South China Sea (SML) is the connection of the atmospheric bottom boundary layer and the deep water of SCS and modulates the air-sea fluxes. In this reach, for typical areas and upper layer stratification of SCS, data analysis and observation combined with large eddy simulation is employed to explore that turbulent mixing process induced by Langmuir circulation (LC) and its nonlinear dynamic mechanism. We systematically investigate the evolution of entrainment velocity, entrainment flux, rise and fall of cool and hot water and vertical eddy viscosity, and quantitatively analyze corresponding turbulent kinetic energy (TKE) budget, momentum fluxes, press fields, velocity fields and velocity shear and their evolution characteristic. This will reveal the similarities and differences of turbulent mixing process and nonline dynamic mechanism. We build the distribution diagram of the time and space evolution of turbulent mixing process and its nonline dynamic mechnism induced by LC in SCS.