Variations of eddy kinetic energy in the South China Sea
Variations of eddy kinetic energy in the South China Sea
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DOI：
10.1007/s10872-010-0007-y
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发表时间：
2010-01
影响因子：
2.3
通讯作者：
Xuhua Cheng;Y. Qi
中科院分区：
文献类型：
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作者：
Xuhua Cheng;Y. Qi
利用15年的融合测高资料，研究了南海涡动动能（EKE）的季节和年际变化。结果表明，南海地区EKE的气候平均值在50 ~ 1400 cm ~ 2/s ~ 2之间，其中越南东南部和台湾岛西南部的EKE值较高。年谐波的EKE的振幅的特点是高值的越南东南部的最大值超过800 cm 2/s 2。南海北方的EKE在8 - 2月达到最大值，而南海南部的EKE在9 - 12月达到最大值。除季节变化外，EKE还表现出较强的年际变化，在厄尔尼诺（La Niña）事件期间，EKE在北半球冬季表现为负（正）距平。与厄尔尼诺-南方涛动事件相关的局地风应力旋度的年际变化可能是南海EKE年际变化的原因。
Fifteen years of merged altimetric data were used to acquire the seasonal to interanual variations of eddy kinetic energy (EKE) in the South China Sea (SCS). The results show that climatological mean EKE in the SCS ranges from 50 cm2/s2to 1,400 cm2/s2, with high values in the regions southeast of Vietnam and southwest of Taiwan Island. The amplitude of the annual harmonic of the EKE is characterized by high values to the southeast of Vietnam where the maximum exceeds 800 cm2/s2. The EKE in the northern SCS reaches its maximum in August-February, while it peaks in September–December in the southern SCS. Besides the seasonal variation, the EKE also shows strong interannual variation, which has a negative (positive) anomaly in boreal winter during El Niño (La Niña) events. The interannual variation of local wind stress curl associated with El Niño-Southern Oscillation events may be the cause of the interannual variation of the EKE in the SCS.