利用合成分析、交叉谱和Morlet小波分析,讨论了夏季100 hPa极涡面积指数与南亚高压东西振荡间的关系。结果表明:极涡与南亚高压东伸指数之间存在显著的反相关关系,当极涡面积扩张时,南亚高压易偏西;当极涡面积收缩时,南亚高压则易东伸。交叉谱的结果也表明:二者在不同波数上,也具有显著关系,在7.5年及3年周期振动上,二者位相相差较小。同时,在南亚高压异常偏东及偏西年份,高度场、流场、温度场均有不同的配置形式,这在一定程度上反映了南亚高压偏东及偏西年不同的环流特征。

The relationships between Polar Vortex and the Oscillation of South Asia High(SAH) in east-and west-directions at 100 hPa levels are mainly studied by using composition analyses cross spectrum analysis,Morlet wavelet transform etc.The results showed that the indexes of Polar Vortex are positively correlated with the Oscillation of South Asia High in east-and west-directions.While the area of Polar Vortex became weak,the South Asia High displayed East deviation anomaly,and vice versa.On the other hand,both the polar vortex and SAH had similar interannual period characters.The results of spectrum analyses showed that they have the significant periods at 7.5 and 3-years.Meanwhile,the composed fields of geopotional height,stream line and temperature had dramatic variations in far east-and west-years of the SAH,It shows the different characters of atmospheric circulation in far east-and west-years of SAH.