太平洋次表层海温年代际变率及其突变特征

被引:13
作者
钟姗姗
何金海
刘宣飞
机构
[1] 南京气象学院大气科学系,南京气象学院大气科学系,南京气象学院大气科学系江苏南京,江苏南京,江苏南京
关键词
次表层海洋; 年代际变率; 传播; 突变;
D O I
10.13878/j.cnki.dqkxxb.2002.05.003
中图分类号
P732.5 [海洋气候];
学科分类号
0706 ; 070601 ;
摘要
利用经验正交函数展开和滑动 t检验等方法研究了太平洋次表层海温的年代际变率特征。研究表明 ,太平洋次表层海温在 1 980年前后从上至下 ,先后经历了一次显著的年代际突变 ,而且随深度不同存在着四种不同的空间突变模态 ,这四种模态的形成与北太平洋海温异常的西南潜沉路径有着密切的联系。从北太平洋窗口区潜沉的年代际信号沿西南路径传播到副热带地区 ,在温跃层 1 60 m上下与西太平洋向东北传播的异常信号汇合。因此 ,北太平洋沿西南潜沉路径传播的年代际信号对 EN-SO的影响可能是间接的 ,而热带西南太平洋则可能扮演更为重要的角色。
引用
收藏
页码:595 / 602
页数:8
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