春季赤道外北太平洋上层流场异常的统计动力诊断

作者：路凯程1 3  卢姁2 3  张铭3

单位：1. 中国人民解放军39506部队82分队 北京 100076;; 2. 中国人民解放军61741部队 北京 100081;; 3. 中国人民解放军理工大学气象学院大气环流与短期气候预测实验室 江苏 南京 211101

关键词：复EOF分析 流场异常 北太平洋 回流漩涡

分类号：论文

出版年·卷·期（页码）：2010·2010·第六期（57-64）

摘要：

采用复EOF分析方法,对春季赤道外的北太平洋海域的上层流场异常做了统计动力诊断,得到以下主要结论:赤道外北太平洋海域上层流场的明显异常主要发生在日本本州岛以东、以南范围不大的关键区内;异常的第一、二模态分别表现为东东北至西西南走向的涡旋偶和涡旋列。该两模态时间系数的辐角均分别有两个状态,相应的偏差流场则分别与其空间场相同或相反;其模的大小决定了其偏差流场偏离以上两个状态的程度;该两模态的时间系数均有非常明显的20年左右的年代际变化。该两模态均反映了黑潮延伸体以南回流漩涡的异常;其性质是海洋Rossby波的异常。

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