| 海-气界面动量通量的估计方法分析与应用 |
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| 引用本文： | 邹仲水,赵栋梁,黄健,李水清,马昕,盛立芳.海-气界面动量通量的估计方法分析与应用[J].海洋学报,2014,36(9):75-83. |
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| 作者姓名： | 邹仲水 赵栋梁 黄健 李水清 马昕 盛立芳 |
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| 作者单位： | 1.中国海洋大学 物理海洋教育部重点实验室,山东 青岛 266003;中国海洋大学 海洋环境学院,山东 青岛 266100 |
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| 基金项目： | 国家重点基础研究发展计划973项目(2009CB421201);国家自然科学基金项目(41076007,41276015,41276009);公益性行业(气象)科研专项(GYHY200906008);教育部博士点基金专项项目(20120132110004)。 |
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| 摘 要： | 首次将经验模态分解方法引入湍流稳定性分析,与传统的线性和滑动平均去势方法进行了比较,发现经验模态分解方法的去势效果最好。基于"南海平台通量观测计划"(FOPSCS)近两年的连续通量观测数据,得到了22 476个摩擦速度的估算值,结果表明,当风速小于5m/s时,拖曳系数随风速增大而减小,而风速大于5m/s时,拖曳系数随风速增大而增大,两种情形分别反映了黏性表皮摩擦和波浪引起的形状阻力对海面风应力的贡献。同时发现短风区情形的拖曳系数大于长风区情形,说明波浪成长状态会对海-气界面动量交换产生影响。
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| 关 键 词： | 拖曳系数 块体公式 去势方法 摩擦速度 |
| 收稿时间： | 2013/10/15 0:00:00 |
| 修稿时间： | 2014/1/15 0:00:00 |
The analysis and application of estimation methods for air-sea interface momentum flux |
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| Zou Zhongshui,Zhao Dongliang,Huang Jian,Li Shuiqing,Ma Xin and Sheng Lifang.The analysis and application of estimation methods for air-sea interface momentum flux[J].Acta Oceanologica Sinica (in Chinese),2014,36(9):75-83. |
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| Authors: | Zou Zhongshui Zhao Dongliang Huang Jian Li Shuiqing Ma Xin and Sheng Lifang |
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| Institution: | Key Laboratory of Physical Oceanography,Ocean University of China,Ministry of Education,Qingdao 266003,China;College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266003,China;Key Laboratory of Physical Oceanography,Ocean University of China,Ministry of Education,Qingdao 266003,China;College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266003,China;Guangdong Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510080,China;Key Laboratory of Physical Oceanography,Ocean University of China,Ministry of Education,Qingdao 266003,China;College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266003,China;Key Laboratory of Physical Oceanography,Ocean University of China,Ministry of Education,Qingdao 266003,China;College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266003,China |
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| Abstract: | The empirical mode decomposition (EMD) method is introduced to analyze the stability of turbulence for the first time and is compared with the traditional detrending methods,like linear detrending(LDT) and running mean filtering (RMF). The results show that EMD is the most reliable method to obtain momentum flux at the air-sea surface. Based on about two years of data from Flux Observation on Platform in South China Sea (FOPSCS) project,22 476 friction velocities were obtained. It was found that when the wind speed is less than 5 m/s,the drag coefficient decreases with the increase of wind speed; whereas,the trend is opposite when wind speed is greater than 5 m/s. These two different cases reflect the contribution to the wind stress from the roughness generated by viscous boundary-layer and wave-induced form drag,respectively. Further analysis shows that the drag coefficient with limited fetch condition is larger than that with unlimited fetch,which revealed the wave age can also influence the momentum exchange at the air-sea surface. |
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| Keywords: | drag coefficients bulk parameterization formula filtering method friction velocity |
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