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SHANG Xiaodong,QI Yongfeng,CHEN Guiying,LIANG Changrong. 2015. Observations of upper layer turbulent mixing in the southern South China Sea. Acta Oceanologica Sinica, 34(11):6-13
Observations of upper layer turbulent mixing in the southern South China Sea
南海南部上层的湍流混合特征
Received:March 19, 2015  Revised:June 02, 2015
DOI:10.1007/s13131-015-0743-3
Key words:southern South China Sea  turbulent mixing  dissipation rate  topography
中文关键词:  南海南部  湍流混合  湍动能耗散率  地形
基金项目:The “CAS/SAFEA International Partnership Program for Creative Research Teams” of Chinese Academy of Seiences under contract Nos XDA11010202, 2013CB430303 and 41376022, 41276021 and 41276023.
Author NameAffiliationE-mail
SHANG Xiaodong State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China xdshang@scsio.ac.cn 
QI Yongfeng State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
CHEN Guiying State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
LIANG Changrong State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
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Abstract:
      A turbulent microstructure experiment was undertaken at a low latitude of 10°N in the South China Sea in late August 2012. The characteristics of the eddy diffusivity above 650 m were analyzed, which is one order of magnitude larger than that in the open ocean at that low latitude. Enhanced eddy diffusivities by strong shears and sharp changes in topography were observed. The strongest eddy diffusivity occurred in the mixed layer, and it reached O(10-2 m2/s). Strong stratification in the thermocline inhibited the penetration of surface eddy diffusivities through the thermocline, where the mixing was weakest. Below the thermocline, where the background eddy diffusivity was approximately O(10-6 m2/s), the eddy diffusivity increased with depth, and its largest value was O(10-3 m2/s).
中文摘要:
      基于2012年8月在中国南海10oN海域进行的微尺度湍流观察资料,分析了650米以浅的湍流混合特征.结果表明在该纬度南海的涡扩散系数要比相同纬度的开阔大洋大一个量级,而强流速剪切及粗糙地形是造成南海南部海域混合增强的主要机制.上混合层最大涡扩散系数可达10-2m2/s量级;温跃层阻隔了上混合层强混合向下传递,涡扩散系数最弱;温跃层以下,背景涡扩散系数约为10-6m2/s量级,其随着深度的增大而增加,最大可达10-3m2/s量级.
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