Large eddy simulation of turbulence in ocean surface boundary layer at Zhangzi Island offshore
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Large eddy simulation of turbulence in ocean surface boundary layer at Zhangzi Island offshore LI Shuang1,2 , SONG Jinbao1∗ , HE Hailun3,4 , HUANG Yansong5 1
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2 Ocean College, Zhejiang University, Hangzhou 310058, China 3 State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 4 College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China 5 South China Sea Marine Engineering Surveying Center, South China Sea Branch, State Oceanic Administration, Guangzhou 510300, China Received 20 March 2012; accepted 18 October 2012 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2013
Abstract This study uses a large eddy simulation (LES) model to investigate the turbulence processes in the ocean surface boundary layer at Zhangzi Island offshore. Field measurements at Zhangzi Island (39◦ N, 122◦ E) during July 2009 are used to drive the LES model. The LES results capture a clear diurnal cycle in the oceanic turbulence boundary layer. The process of the heat penetration and heat distribution characteristics are analyzed through the heat flux results from the LES and their differences between two diurnal cycles are discussed as well. Energy balance and other dynamics are investigated which show that the tide-induced shear production is the main source of the turbulence energy that balanced dissipation. Momentum flux near the surface shows better agreement with atmospheric data computed by the eddy correlation method than those computed by bulk formula. Key words: ocean surface boundary layer, large eddy simulation, turbulence, momentum flux, heat flux Citation: Li Shuang, Song Jinbao, He Hailun, Huang Yansong. 2013. Large eddy simulation of turbulence in ocean surface boundary layer at Zhangzi Island offshore. Acta Oceanologica Sinica, 32(7): 8–13, doi: 10.1007/s13131-013-0326-0
1 Introduction Turbulence in ocean surface boundary layer is so crucial of affecting the way that momentum and heat transporting from the top to the bottom. Therefore, it dramatically affects the air-sea interaction process, which time-scale covers from the weather to the climate. Determining the momentum flux and the heat flux are essential for establishing the hurricane developing process (Andreas and Emanuel, 2001; Bao, 2000), basinscale interannual variation (Curchitser et al., 2005), and the potential trend of global warming (Danabasoglu et al., 2006). However, it is not surprising that the present capability of measuring the turbulence activity in the atmospheric and oceanic boundary layer is still a major impediment in air-sea interaction. Solving this problem involves the high-resolution turbulence statistic which requires not only the physical equipment but also the post-processing techniques. Based on the Monin-Obukhov similarity theory, the airsea flux can be estimated by pro
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