The main results show as following: (1) There is obvious inter-annual and inter-decadal variation for polar vortex, including the variation of area, intensity and location.
主要结论如下：(1)北半球及各分区极涡的面积、强度及位置有着很明显的年际及年代际变化。
There are distinct differences of the trends of extreme temperature variation between different regions, but the periodic variation analysis show that the inter-decadal variations are consistent.
各区域的极端温度值时间变化存在较大差异，但是周期分析显示，各区域极端温度值的年代际周期振荡具有全省一致性。
There are distinct differences of the trends of extreme temperature variation between different regions, but the periodic variation analysis show that the inter-decadal variations are consistent.
各区域的极端温度值时间变化存在较大差异，但是周期分析显示，各区域极端温度值的年代际周期振荡具有全省一致性。
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