Interannual modulation of eddy kinetic energy in the northeastern South China Sea as revealed by an eddy‐resolving OGCM
Interannual modulation of eddy kinetic energy in the northeastern South China Sea as revealed by an eddy‐resolving OGCM
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DOI：
10.1002/2015jc011497
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发表时间：
2016-05
影响因子：
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通讯作者：
Zhongbin Sun;Zhiwei Zhang;Wei Zhao;Jiwei Tian
中科院分区：
文献类型：
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作者：
Zhongbin Sun;Zhiwei Zhang;Wei Zhao;Jiwei Tian
基于1980 - 2014年南海涡旋解析海洋环流模式输出，研究了南海东北部涡旋动能（EKE）的年际调制。EKE表现出明显的年际变化，周期在1.5年至7年之间。年际调制的最大峰谷幅度出现在2004-2005年，约为时间平均EKE水平的1.5倍。进一步分析表明，东北-南海EKE的年际变化主要受吕宋海峡运输（LST）的调节。在高eke年，地表温度升高与黑潮入侵增强相对应。黑潮侵入的增强增强了东南-南海洋流的斜压不稳定性，从而导致强东中国海。在低eke年，当LST较小时，情况正好相反。本文还讨论了ENSO和太平洋中尺度涡旋对地表温度年际调制的影响。
Interannual modulation of eddy kinetic energy (EKE) in the northeastern South China Sea (NE-SCS) is investigated based on outputs of an eddy-resolving oceanic general circulation model between 1980 and 2014. The EKE displays distinct interannual modulations with periods between 1.5 and 7 years. The maximum peak-to-trough amplitude of the interannual modulation occurred during period 2004–2005, which was about 1.5-fold the time-mean EKE level. Further analysis suggested that interannual variability of EKE in the NE-SCS is primarily modulated by the Luzon Strait transport (LST). During high-EKE years, the LST increases corresponding to a strengthened Kuroshio intrusion. The strengthened Kuroshio intrusion enhances the baroclinic instability of current in the NE-SCS and thus leads to a strong EKE. The reverse is true during low-EKE years when LST is smaller. Influences of ENSO and Pacific mesoscale eddies on the interannual modulation of LST are also discussed in this study.