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    Qiu Chunhua,Ouyang Juan,Yu Jiancheng,Mao Huabin,Qi Yongfeng,Wu Jiaxue,Su Danyi. 2020. Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea. Acta Oceanologica Sinica, 39(11):82-90
    Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea
    基于自動探測方法的南海北部渦致海表溫度鋒面的特征研究
    Received:June 15, 2020  
    DOI:10.1007/s13131-020-1669-y
    Key words:detection method  mesoscale eddy SST front  northern South China Sea
    中文關鍵詞:  探測方法  中尺度渦致海表溫度鋒  南海北部
    基金項目:The National Natural Science Foundation of China under contract No. 41976002.
    Author NameAffiliationE-mail
    Qiu Chunhua School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China
    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519020, China 
    qiuchh3@mail.sysu.edu.cn 
    Ouyang Juan School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China  
    Yu Jiancheng State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China  
    Mao Huabin State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
    Qi Yongfeng State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
    Wu Jiaxue School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China
    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519020, China 
    wujiaxue@mail.sysu.edu.cn 
    Su Danyi School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China  
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    Abstract:
          SST fronts at the mesoscale eddy edge (ME fronts) were investigated from 2007–2017 in the northern South China Sea (NSCS) based on an automatic method using satellite sea level anomaly (SLA) and SST data. The relative probabilities between the number of anticyclonic/cyclonic ME fronts (AEF/CEF) and the number of anticyclones/cyclones reached 20%. The northeastern and southwestern parts of these anticyclones had more fronts than the northwestern and southeastern parts, although CEFs were nearly equally distributed in all directions. The number of ME fronts had remarkable seasonal variations, while the eddy kinetic energy (EKE) showed no seasonal variations. The total EKE at the ME fronts was three times of that within the MEs, and it was much stronger in AEFs than in CEFs. The interannual variability in the number of ME fronts and EKE had no significant correlation with the El Niño-Southern Oscillation (ENSO) index. Possible mechanisms of ME fronts were discussed, but the contributions of mesoscale eddies to SST fronts need to be quantified in future studies.
    中文摘要:
          南海北部具有豐富的溫度鋒面和中尺度渦,它們調節著局地的熱量和能量平衡。本文利用衛星海洋高度異常和海表溫度數據,并基于自動探測方法,探究了2007年至2017年南海北部中尺度渦邊緣的海表溫度鋒面(渦致鋒面)特征。反氣旋/氣旋邊緣出現鋒面的概率可達20%。氣旋渦在各個方向上出現鋒面的概率比較均勻,反氣旋渦的東北部和西南部出現鋒面的概率大于西北部和東南部。中尺度渦致鋒面的數量有明顯的季節變化,而渦動能未表現出明顯的季節變化。中尺度渦致鋒區的總渦動能是中尺度渦內動能的3倍,并且反氣旋渦致鋒面的總渦動能明顯強于氣旋渦致鋒面的總渦動能。中尺度渦致鋒面的數量和渦動能的年際變化與厄爾尼諾南方濤動指數沒有明顯的相關性。本研究也討論了中尺度渦致鋒面的可能機制,但是中尺度渦對海表溫度鋒的貢獻需要進一步定量研究。
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