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    Qi Yongfeng,Shang Chenjing,Mao Huabin,Qiu Chunhua,Liang Changrong,Yu Linghui,Yu Jiancheng,Shang Xiaodong. 2020. Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea. Acta Oceanologica Sinica, 39(11):69-81
    Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea
    南海北部中尺度反氣旋渦的湍流混合空間分布特征
    Received:June 23, 2020  
    DOI:10.1007/s13131-020-1676-z
    Key words:mesoscale eddy  turbulent mixing  South China Sea  GHP parameterization  Thorpe-scale method
    中文關鍵詞:  中尺度渦  混合率  南海  GHP參數化方案  Thorpe-scale方法
    基金項目:The National Key R&D Plan of China under contract Nos 2017YFC0305904, 2017YFC0305804 and 2016YFC1401404; the National Natural Science Foundation of China under contract Nos 41876023, 41630970, 41806037, 41706137 and 41806033; the Guangdong Science and Technology Project under contract Nos 2019A1515111044, 2018A0303130047 and 2017A030310332; the Guangzhou Science and Technology Project under contract No. 201707020037; the Natural Science Foundation of Shenzhen University under contract No. 2019078; the Dedicated Fund for Promoting High-quality Economic Development in Guangdong Province (Marine Economic Development Project) under contract No. GDOE[2019]A03; the Independent Research Project Program of State Key Laboratory of Tropical Oceanography under contract Nos LTOZZ1902 and LTO1909.
    Author NameAffiliationE-mail
    Qi Yongfeng State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
    Shang Chenjing Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, China  
    Mao Huabin State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
    Ocean College, Zhejiang University, Zhoushan 316021, China 
    maohuabin@scsio.ac.cn 
    Qiu Chunhua The Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China  
    Liang Changrong State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
    Yu Linghui State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
    Yu Jiancheng State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China  
    Shang Xiaodong State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
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    Abstract:
          Upper turbulent mixing in the interior and surrounding areas of an anticyclonic eddy in the northern South China Sea (SCS) was estimated from underwater glider data (May 2015) in the present study, using the Gregg-Henyey-Polzin parameterization and the Thorpe-scale method. The observations revealed a clear asymmetrical spatial pattern of turbulent mixing in the anticyclonic eddy area. Enhanced diffusivity (in the order of 10–3 m2/s) was found at the posterior edge of the anticyclonic mesoscale eddy; on the anterior side, diffusivity was one order of magnitude lower on average. This asymmetrical pattern was highly correlated with the eddy kinetic energy. Higher shear variance on the posterior side, which is conducive to the triggering of shear instability, may be the main mechanism for the elevated diffusivity. In addition, the generation and growth of sub-mesoscale motions that are fed by mesoscale eddies on their posterior side may also promote the occurrence of strong mixing in the studied region. The results of this study help improve our knowledge regarding turbulent mixing in the northern SCS.
    中文摘要:
          文章利用GHP細結構參數化方法和Thorpe-scale方法,分析水下滑翔機于2015年5月在南海北部采集的數據,估算了南海北部中尺度反氣旋渦的湍流混合空間分布特征。結果顯示該反氣旋渦的混合具有明顯的空間非對稱性,混合率在其運動方向的后側邊緣明顯增強達到O(10-3 m2/s)量級;而在其運動方向的前側邊緣,平均混合率要小一個量級。這一混合非對稱特征與中尺度的渦動能密切相關性。中尺度渦后側邊緣處存在高流速剪切,容易引起垂向剪切不穩定,可能是引起該處混合增強的主要因素。另外,中尺度渦后側邊緣發展的次中尺度過程同樣導致了該處強混合。本研究結果有助于人們進一步認識南海北部的混合過程。
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