| The variation of turbulent diapycnal mixing at 18°N in the South China Sea stirred by wind stress |
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| 引用本文： | 刘永正,荆钊,吴立新.The variation of turbulent diapycnal mixing at 18°N in the South China Sea stirred by wind stress[J].海洋学报(英文版),2017,36(5):26-30. |
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| 作者姓名： | 刘永正 荆钊 吴立新 |
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| 作者单位： | 中国海洋大学, 物理海洋重点实验室, 青岛国家海洋科学与技术实验室, 青岛, 266100;美国德州农工大学, 海洋学系, 卡城, 77843-3146,中国海洋大学, 物理海洋重点实验室, 青岛国家海洋科学与技术实验室, 青岛, 266100;美国德州农工大学, 海洋学系, 卡城, 77843-3146,中国海洋大学, 物理海洋重点实验室, 青岛国家海洋科学与技术实验室, 青岛, 266100;美国德州农工大学, 海洋学系, 卡城, 77843-3146 |
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| 基金项目： | The National Basic Research Program (973 Program) of China under contract No. 2013CB956201; the National Natural Science Foundation of China under contract Nos 41521091, U1406401 and 41622602; the Global Change Project under contract No. GASI-03-01-01-05. |
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| 摘 要： | The spatial and temporal variations of turbulent diapycnal mixing along 18°N in the South China Sea(SCS) are estimated by a fine-scale parameterization method based on strain, which is obtained from CTD measurements in yearly September from 2004 to 2010. The section mean diffusivity can reach ~10~(–4)m~2/s, which is an order of magnitude larger than the value in the open ocean. Both internal tides and wind-generated near-inertial internal waves play an important role in furnishing the diapycnal mixing here. The former dominates the diapycnal mixing in the deep ocean and makes nonnegligible contribution in the upper ocean, leading to enhanced diapycnal mixing throughout the water column over rough topography. In contrast, the influence of the wind-induced nearinertial internal wave is mainly confined to the upper ocean. Over both flat and rough bathymetries, the diapycnal diffusivity has a growth trend from 2005 to 2010 in the upper 700 m, which results from the increase of wind work on the near-inertial motions.
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| 关 键 词： | 跃密混合 扩散率 风生近惯性内波 海底地形 |
| 收稿时间： | 2016/3/19 0:00:00 |
The variation of turbulent diapycnal mixing at 18°N in the South China Sea stirred by wind stress |
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| LIU Yongzheng,JING Zhao and WU Lixin.The variation of turbulent diapycnal mixing at 18°N in the South China Sea stirred by wind stress[J].Acta Oceanologica Sinica,2017,36(5):26-30. |
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| Authors: | LIU Yongzheng JING Zhao and WU Lixin |
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| Institution: | Physical Oceanography Laboratory, Ocean University of China/CIMST, Qingdao 266100, China;Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China |
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| Abstract: | The spatial and temporal variations of turbulent diapycnal mixing along 18°N in the South China Sea (SCS) are estimated by a fine-scale parameterization method based on strain, which is obtained from CTD measurements in yearly September from 2004 to 2010. The section mean diffusivity can reach~10-4 m2/s, which is an order of magnitude larger than the value in the open ocean. Both internal tides and wind-generated near-inertial internal waves play an important role in furnishing the diapycnal mixing here. The former dominates the diapycnal mixing in the deep ocean and makes nonnegligible contribution in the upper ocean, leading to enhanced diapycnal mixing throughout the water column over rough topography. In contrast, the influence of the wind-induced near-inertial internal wave is mainly confined to the upper ocean. Over both flat and rough bathymetries, the diapycnal diffusivity has a growth trend from 2005 to 2010 in the upper 700 m, which results from the increase of wind work on the near-inertial motions. |
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| Keywords: | diapycnal mixing diffusivity wind-induced near-inertial internal wave topography |
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