Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea
Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea
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DOI：
10.1007/s13131-020-1669-y
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发表时间：
2020-11
影响因子：
1.4
通讯作者：
C. Qiu;Juan Ouyang;Jiancheng Yu;H. Mao;Yongfeng Qi;Jiaxue Wu;Danyi Su
中科院分区：
文献类型：
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作者：
C. Qiu;Juan Ouyang;Jiancheng Yu;H. Mao;Yongfeng Qi;Jiaxue Wu;Danyi Su
利用2007-2017年南海北方中尺度涡旋边缘SST锋（ME锋）资料，利用卫星海平面距平（SLA）和SST资料，采用自动化方法对南海中尺度涡旋边缘SST锋进行了研究。反气旋/气旋性ME锋数与反气旋/气旋数的相对概率达20%。这些反气旋的东北部和西南部比西北部和东南部有更多的锋面，尽管CEF几乎均匀地分布在各个方向。ME锋数有明显的季节变化，而涡动动能（EKE）没有明显的季节变化。在ME前线的总EKE是ME内的三倍，它是在AEFs比CEFs强得多。赤道锋数和EKE的年际变化与厄尔尼诺-南方涛动（ENSO）指数的相关性不显著。本文还讨论了中尺度涡旋对SST锋的影响机制，但中尺度涡旋对SST锋的贡献有待于进一步研究。
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.