摘要
本文应用统计方法讨论6～11月的准PNA型,得到如下结论: 秋季,低纬中太平洋热源异常,能发出位置与PNA型相类似的遥相关型——准PNA型。这种遥相关型呈二维Rossby波列,具有相当正压结构,在西风带中沿固定波导向极向东传播,从而影响中太平洋和北美天气。 夏季,由于热源位置的差异,则不存在与PNA型相类似的遥相关型。从而认为热源的扰动在遥相关型的成因上起着举足轻重的作用。
The One - point correlation maps of 500hpa and 1000-500hpa thickness from June to November and the SST distributions in the tropical middle Pacific are analyzed statistically in this paper.
The primary r.esults may be noted:
In autumn, the SST Anamaly in the tropical middle pacific may form the teleconnection pattern, very similar to PNA pattern, and may be called Quasi -PNA Pattern. It has twodimesion-al Rossby wave train and equivalent barotropic structure, it effects the weather of the middle Pacific and North America because it travels along in constaut ways toward Pojar and east in westerly belt. In summer, because of the heating source position shift, there is no quasi -PNA pattern existing.
The position of the heating source plays an important role in causing the formation of the teleconnection- pattern - the quasi - PNA pattern.
出处
《成都信息工程学院学报》
1991年第Z1期46-53,共8页
Journal of Chengdu University of Information Technology
关键词
大气环流
遥相关型
PNA型
低纬热源
Rossby波列
正压结构
Atmospheric circulation
Teleconnection pattern
PNA pattern
Tropical middle Pacific
Rossby wave train
Equivalent barotropic structure.
