热带印度洋海面温度与高度的相关性分析

基于海面温度与海面高度异常的月均数据，采用EOF、SVD和功率谱分析等方法，对热带印度洋海面温度与海面高度进行特征分析，研究两者在时空结构上的相关性。利用EOF方法分析出海面温度第二模态与海面高度第一模态的空间结构类似，呈现偶极型。相关分析与功率谱表明，两模态的时间序列存在滞后相关和类似的周期结构。SVD结果显示，第一耦合模态的相关系数达0.7左右，且左右场的空间形态呈现东西反相。这表明，海面高度偶极型与海面温度的单极型和偶极型存在着相关。同时，海面高度指数也表现与偶极子指数类似的结构特征。针对上述诊断分析事实特征，对海面温度和海面高度偶极子形成的物理机制进行了初步分析，总结了前人所做的一些工作，指出其中可能的影响因素。

Analysis of related characteristics of sea surface temperature and sea surface height in tropical Indian Ocean

Based on the monthly SST and sea level anomaly (SLA) data,the objective of this study is to investigate the correlation between sea surface temperature (SST) and sea surface height in Tropical Indian Ocean in spatial temporal structure, with the application of empirical orthogonal function(EOF), singular value decompusition(SVD) and power spectrum method. The EOF results show that the 2nd mode of SST and the 1st mode of SLA share a dipole distribution in spatial structure. Moreover, the two modes demonstrate a lag correlation and a similar temporal structure by the use of correlation analysis and power spectrum method. The correlation coefficient of the first coupled mode of SST and SLA based on SVD analysis reaches 0.7, and the spatial structures exhibit a reverse distribution on west and east sides of Indian Ocean. The results indicate that the dipole mode of SLA correlates with the monopole mode and dipole mode of SST. Meanwhile, the SLA index and the Indian Ocean dipole(IOD) index (DMI) both share a similar structure. In addition, a preliminary analysis of the physical mechanism explaining the correlations between the above diagnostic facts was conducted. Possible elements that contribute to the above facts were pointed out by making a summary of the other authors’ work.