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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
基于自动探测方法的南海北部涡致海表温度锋面的特征研究
Received:June 15, 2020  
DOI:10.1007/s13131-020-1669-y
Key words:detection method  mesoscale eddy SST front  northern South China Sea
中文关键词:  探测方法  中尺度涡致海表温度锋  南海北部
基金项目: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:
      南海北部具有丰富的温度锋面和中尺度涡,它们调节着局地的热量和能量平衡。本文利用卫星海洋高度异常和海表温度数据,并基于自动探测方法,探究了2007年至2017年南海北部中尺度涡边缘的海表温度锋面(涡致锋面)特征。反气旋/气旋边缘出现锋面的概率可达20%。气旋涡在各个方向上出现锋面的概率比较均匀,反气旋涡的东北部和西南部出现锋面的概率大于西北部和东南部。中尺度涡致锋面的数量有明显的季节变化,而涡动能未表现出明显的季节变化。中尺度涡致锋区的总涡动能是中尺度涡内动能的3倍,并且反气旋涡致锋面的总涡动能明显强于气旋涡致锋面的总涡动能。中尺度涡致锋面的数量和涡动能的年际变化与厄尔尼诺南方涛动指数没有明显的相关性。本研究也讨论了中尺度涡致锋面的可能机制,但是中尺度涡对海表温度锋的贡献需要进一步定量研究。
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