| Wave breaking on turbulent energy budget in the ocean surface mixed layer |
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| 作者姓名： | 孙群 管长龙 宋金宝 |
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| 作者单位： | Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071，China，Physical Oceanography Laboratory，Ocean University of China，Qingdao 266003，China |
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| 基金项目： | the NSFC，Knowledge Innovation Programs of the Chinese Academy of Sciences，the NSFDYS |
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| 摘 要： | As an important physical process at the air-sea interface, wave movement and breaking have a significant effect on the ocean surface mixed layer （OSML）. When breaking waves occur at the ocean surface, turbulent kinetic energy （TKE） is input downwards, and a sublayer is formed near the surface and turbulence vertical mixing is intensively enhanced. A one-dimensional ocean model including the Mellor-Yamada level 2.5 turbulence closure equations was employed in our research on variations in turbulent energy budget within OSML. The influence of wave breaking could be introduced into the model by modifying an existing surface boundary condition of the TKE equation and specifying its input. The vertical diffusion and dissipation of TKE were effectively enhanced in the sublayer when wave breaking was considered. Turbulent energy dissipated in the sublayer was about 92.0% of the total depth-integrated dissipated TKE, which is twice higher than that of non-wave breaking. The shear production of TKE decreased by 3.5% because the mean flow fields tended to be uniform due to wave-enhanced turbulent mixing. As a result, a new local equilibrium between diffusion and dissipation of TKE was reached in the wave-enhanced layer. Below the sublayer, the local equilibrium between shear production and dissipation of TKE agreed with the conclusion drawn from the classical law-of-the-wall （Craig and Banner, 1994）.
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| 关 键 词： | 海洋表面混合层 波浪 湍动能预算 海洋动力 |
| 文章编号： | 10.1007/s00343-008-0009-4 |
| 收稿时间： | 2006-11-21 |
| 修稿时间： | 2007-04-15 |
Wave breaking on turbulent energy budget in the ocean surface mixed layer |
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| Sun?Qun,Guan?Changlong,Song?Jinbao.Wave breaking on turbulent energy budget in the ocean surface mixed layer[J].Chinese Journal of Oceanology and Limnology,2008,26(1):9-13. |
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| Authors: | Sun Qun Guan Changlong Song Jinbao |
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| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;(2) Physical Oceanography Laboratory, Ocean University of China, Qingdao, 266003, China |
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| Abstract: | As an important physical process at the air-sea interface.wave movement and breaking have a significant effect on the ocean surface mixed layer (OSML).When breaking waves occur at the ocean surface,turbulent kinetic energy (TKE) is input downwards,and a sublayer is formed near the surface and turbulence vertical mixing is intensively enhanced.A one-dimensional ocean model including the Mellor-Yamada level 2.5 turbulence closure equations was employed in our research on variations in turbulent energy budget wimin OSML.The influence of wave breaking could be introduced into the model by modifying an existing surface boundary condition of the TKE equation and specifying its input.The vertical diffusion and dissipation of TKE were effectively enhanced in the sublayer when wave breaking was considered.Turbulent energy dissipated in the sublayer was about 92.0% of the total depth-integrated dissipated TKE,which is twice higher than that of non-wave breaking.The shear production of TKE decreased bv 3.5% because the mean flow fields tended to be uniform due to wave-enhanced turbulent mixing.As a result.a new local equilibrium between diffusion and dissipation of TKE was reached in the wave-enhanced layer.Below the sublayer,the local equilibrium between shear production and dissipation of TKE agreed with the conclusion drawn from the classical law-of-the-wall (Craig and Banner,1994). |
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| Keywords: | wave breaking ocean surface mixed layer turbulent energy budget |
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