A dipole mode at thermocline layer in the tropical Indian Ocean
A dipole mode at thermocline layer in the tropical Indian Ocean
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DOI：
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发表时间：
2003
影响因子：
1.4
通讯作者：
Tian Ji-wei;Liu Huiqing;Q. Wei-hong
中科院分区：
文献类型：
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作者：
Tian Ji-wei;Liu Huiqing;Q. Wei-hong
通过对近45年来各层温度资料的分析，发现在温跃层（DMT）中存在一种偶极模态：苏门答腊外海海温异常寒冷，西印度洋海温异常温暖。首先分析了赤道印度洋沿着各层的温度和温度距平。这表明，在热带印度洋的冷，温暖的TA信号出现在次表层比在表面。这一结果表明，在热带印度洋次表层可能存在一个强的偶极子模态。其次，利用经验正交函数法对温跃层TA进行了分析。第一种模式是偶极模式。最后分析了DMT与地面热带偶极子模（SDM）、DMT与Nino 3海温异常等的相关性，这些相关性都很强。
Temperature data at different layers of the past 45 years were studied and we found a diploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian Ocean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.