海洋上层湍动能耗散率观测及参数化研究

项目名称： 海洋上层湍动能耗散率观测及参数化研究

项目编号： No.41276035

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 黄传江

作者单位： 国家海洋局第一海洋研究所

项目金额： 78万元

中文摘要： 在海洋中，小尺度的湍流影响局地的混合和温盐分布，进而影响全球海洋和整个气候系统。研究和发展湍流参数化，对完善目前的混合参数化方案，提高数值模式对全球海洋和气候系统的模拟和预报能力有重要意义。目前的海洋上层湍动能耗散率方案或基于相似性理论，或基于波-湍相互作用，仅对单一的过程进行参数化，它们只能对部分观测进行模拟，与其它观测存在较大的偏差。 本项目以现场观测为主，包括湖泊实验和大洋实验，对水体中的湍动能耗散率、波浪、流场和温盐分布以及相关气象要素进行系统的测量。通过这些观测，本项目主要研究剪切流、风浪、涌浪和对流等过程对海洋上层湍流的影响，了解波浪成长和消衰阶段湍动能耗散率的分布和演化规律；分析造成耗散率不同分布的原因，确定所涉及的主要物理机制；综合各种机制的影响，发展更完善的海洋上层湍动能耗散率参数化方案，提高数值模式对全球海洋和气候系统的模拟能力。

中文关键词： 现场观测；湍流耗散率；ADV；EMD；Langmuir环流

英文摘要： The small scale turbulence plays an important role in the global ocean and climate system throughout regulating the local mixing and distributions of the temperature and salinity. Research and development of the turbulence parameterization can improve the parameterization of the vertical mixing, thereby improving the simulation and forecast of numerical models to the global ocean and climate. The parameterization schemes of the turbulence dissipation rate are usually based on the similarity theory or wave-turbulence interaction at present. These schemes can only make a good prediction to a part of the observation, while deviate greatly from the others. The field observations, both in the lake and in the open ocean, will be conducted in this project, in which some factors, including the turbulence dissipation rate, surface waves, currents, temperature, salinity, as well as the related meteorogical factors, are accurately measured. Based on these observations, we will analyze the influences of some processes, such as the current shear, wind waves, swells, and cooling convection, to the turbulence of the upper ocean, and study the evolution and distribution of the turbulence dissipation rate during the stages of the developing wave and decaying wave. The processes influenced the distribution of the dissipation rat

英文关键词： Field observation；TKE dissipation rate；ADV；EMD；Langmuir circulation