The analysis and application of estimation methods for air-sea interface momentum flux

Zou Zhongshui; Zhao Dongliang; Huang Jian; Li Shuiqing; Ma Xin; Sheng Lifang

doi:10.3969.issn.0253-4193.2014.09.009

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Zou Zhongshui, Zhao Dongliang, Huang Jian, Li Shuiqing, Ma Xin, Sheng Lifang. The analysis and application of estimation methods for air-sea interface momentum flux[J]. Haiyang Xuebao, 2014, 36(9): 75-83. doi: 10.3969.issn.0253-4193.2014.09.009

Citation:

Zou Zhongshui, Zhao Dongliang, Huang Jian, Li Shuiqing, Ma Xin, Sheng Lifang. The analysis and application of estimation methods for air-sea interface momentum flux[J]. Haiyang Xuebao, 2014, 36(9): 75-83. doi: 10.3969.issn.0253-4193.2014.09.009

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The analysis and application of estimation methods for air-sea interface momentum flux

doi: 10.3969.issn.0253-4193.2014.09.009

1.
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
2.
Guangdong Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510080,China
3.
Key Laboratory of Physical Oceanography,Ocean University of China,Ministry of Education,Qingdao 266003,China
4.
College of Physical and Environmental Oceanography,Ocean University of China,Qingdao 266003,China

Received Date: 2013-10-15
Rev Recd Date: 2014-01-15

Abstract

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.
- drag coefficients,
- bulk parameterization formula,
- filtering method,
- friction velocity

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