Interannual modulation of eddy kinetic energy in the northeastern South China Sea as revealed by an eddy‐resolving OGCM

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• 作者：Zhongbin Sun ; Zhiwei Zhang ; Wei Zhao ; Jiwei Tian
• 刊名：Journal of Geophysical Research: Oceans
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：121
• 期：5
• 页码：3190-3201
• 全文大小：1.8MB
• ISSN：2169-9291

文摘

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.