南海陆架锋面混合及其控制机制研究

Of the many physical dynamics processes, the frontogenesis and its turbulence mixing may play important role in maintaining the high biological pump working in continental shelf seas. So, an extensive survey on the frontal turbulent mixing and its dominant forcing mechanism are believed to be most important for further understanding the oceanic mixing theory. In this project, we will present observations of the wind speeds, as well as the profiles of sea water temperature, salinity, velocity, energy dissipation rate, nutrient and chlorophyll along the frontal region of South China Sea. The vertical and horizontal distribution features of the Richardson number, energy dissipation rate, and turbulent eddy diffusivity on both sides along the front will be also investigated. Furthermore, the main objective of this project is to examine the turbulent mixing mechanism in the frontal region under the wind forcing condition in northwest region of South China Sea. This study is thought to be an important basis for further investigations of oceanic energy, heat and mass budgets, as well as the biological environmental effects in the seasonal frontal region.

在维持陆架海生物泵高效运转的诸多物理过程中，海洋锋面过程及其混合在其中发挥着重要作用。因此，开展锋面混合观测及其控制机制的研究，对于深入发展海洋混合理论具有十分重要的意义和作用。 本项目拟在南海陆架锋面海区，通过综合海面风场、海水温度、盐度、流场、湍流动能耗散率、营养盐和叶绿素沿锋面的分布，确定沿锋面两侧垂直和水平方向上Richardson数、湍流动能耗散率和混合率的分布特征，揭示南海西北部陆架锋面在风应力作用下的混合机制及其跨锋面物质和能量交换机制，为深入开展海洋能量、热量和物质收支平衡，以及季节性锋面海区生态环境效应研究奠定基础。

在维持陆架海生物泵高效运转的诸多物理过程中，海洋锋面过程及其混合在其中发挥着重要作用。因此，开展锋面混合观测及其控制机制的研究，对于深入发展海洋混合理论具有十分重要的意义和作用。 本项目在南海琼东锋面海区，通过综合海面风场、海水温度、盐度、流场、湍流动能耗散率沿锋面的分布，确定沿锋面两侧垂直和水平方向上Richardson数、次级环流、湍流混合特征及其参数化，为深入开展海洋能量、热量和物质收支平衡，以及季节性锋面海区生态环境效应研究奠定基础。