| WANG Zhifeng,WU Kejian,XIA Changshui,ZHANG Xiaoshuang. 2014. The impact of surface waves on the mixing of the upper ocean. Acta Oceanologica Sinica, 33(9):32－39 |
| The impact of surface waves on the mixing of the upper ocean |
| 表面波浪对海洋上层混合的作用 |
| Received:March 28, 2013 Revised:June 09, 2013 |
| DOI：10.1007/s13131-014-0514-6 |
| Key words:surface waves Stokes drift Langmuir turbulence mixing |
| 中文关键词: 表面波浪 Stokes漂流 Langmuir湍效应 混合 |
| 基金项目:The Open Fund of the Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China (Fundamental Research Funds for the Central Universities) under contract No. 201362045; the Open Fund of the Key Laboratory of Digital Ocean, State Oceanic Administration of China under contract No. KLDO201406. |
| Author Name | Affiliation | E-mail | | WANG Zhifeng | College of Engineering, Ocean University of China, Qingdao 266100, China | | | WU Kejian | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China | kejianwu@ouc.edu.cn | | XIA Changshui | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | ZHANG Xiaoshuang | Key Laboratory of Marine Environmental Information Technology, National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | |
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| Abstract: |
| A new three-dimensional numerical model is derived through a wave average on the primitive N-S equations, in which both the "Coriolis-Stokes forcing" and the "Stokes-Vortex force" are considered. Three ideal experiments are run using the new model applied to the Princeton ocean model (POM). Numerical results show that surface waves play an important role on the mixing of the upper ocean. The mixed layer is enhanced when wave effect is considered in conjunction with small Langmuir numbers. Both surface wave breaking and Stokes production can strengthen the turbulent mixing near the surface. However, the influence of wave breaking is limited to a thin layer, but Stokes drift can affect the whole mixed layer. Furthermore, the vertical mixing coefficients clearly rise in the mixed layer, and the upper ocean mixed layer is deepened especially in the Antarctic Circumpolar Current when the model is applied to global simulations. It indicates that the surface gravity waves are indispensable in enhancing the mixing in the upper ocean, and should be accounted for in ocean general circulation models. |
| 中文摘要: |
| 本文对N-S方程进行波浪平均，得到一个新的三维数值模型。该模型同时考虑大尺度力“Coriolis-Stokes力”和小尺度力“Stokes-Vortex力”。将三维数值模型应用到海洋模式POM中，选取不同的参数进行理想数值实验。结果表明随着Langmuir数逐渐减小，垂向混合逐渐增强。波浪破碎和Stokes湍效应都能加强垂向混合，但波浪破碎的影响仅仅局限在表层很薄的一层，而Stokes湍效应可以影响到整个混合层。将模型应用于全球大洋，结果发现海洋上层垂向混合加强，垂向混合系数变大，以南极绕极流海域最为明显。研究表明表面波浪对海洋上层混合具有重要作用，进行海洋数值模拟时，需要考虑波浪诱导的混合效应。 |
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