东亚夏季波列经验正交函数分析
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摘要: 利用经验正交函数作为分析工具,利用500 hPa高度场资料针对东亚地区波列出现情况进行研究,得出结论如下:(1) 从东西伯利亚上游经鄂霍茨克海到日本东部海面的波列(OKJ波列)在初、仲夏(6—7月)的信号很强,为欧亚范围内最主要的分布类型。(2) 从菲律宾经日本到北美的波列(P-J波列)可在整个夏季(6—8月)具有相当强的信号,虽然均表现为第二特征向量分布,贡献率与6—7月欧亚范围内第一特征向量表现OKJ波列的相当。(3) 合成分析表明OKJ和P-J类波列在某种程度上可以共存。
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