热带太平洋-南海-印度洋海面风与海面温度年际变化整体耦合的主模态

The Main Coupled Mode of SSW and SST in the Tropical Pacific-South China Sea-Tropical Indian Ocean on Interannual Time Scale

利用COADS资料和相关分析、经验正交函数分解、奇异值分解和小波分析等方法对热带太平洋 南海 印度洋的海表面温度(SST)及海面风场(SSW )进行了研究,确定了热带太平洋、南海以及印度洋作为1个整体时海面风场及海面温度场相互作用的主模态。在把热带太平洋、南海和印度洋作为整体的情况下,研究了该模态的时空分布特征。各种方法研究均表明,该模态在热带太平洋上为ENSO模态;在热带印度洋上为对应于ENSO态的印度洋“单极型”模态;在南海则表现为整个海盆尺度上的一致型。

Based on the COADS data, the coupled mode of SSWA (sea surface wind anomaly) and SSTA for the whole tropical Pacific-the South China Sea-the tropical Indian Ocean is studied, using various methods such as correlation analysis, Empirical Orthogonal Function (EOF) analysis, Singular Value Decomposition (SVD) and wavelet analysis. It is shown that there exists a dominant mode of SSWA and SSTA when considering the tropical Pacific, the Indian Ocean and the South China Sea as a whole. Through conducting Singular Value Decomposition (SVD), the main coupled mode for such a big area is found and discussed. In the Pacific the main mode is the ENSO cycle, a unanimous variance is found to be the dominant mode in the Tropical Indian Ocean, and the South China Sea has a basin-scale homogeneity.