The oscillation of polar vortex area over Eurasia propagates separately eastward and westward.
在欧亚大陆的极涡面积大小的振荡分别向东—西两方向传播。
For the polar vortex area on the Northern Hemisphere, in summer the polar vortex boundary withdraw about 30 latitudes than winter.
冬夏季北半球极涡面积的比较发现夏季和冬季相比极涡边界收缩了近30个纬度。
It is evident positive relative between the Arctic sea ice and the polar vortex area, yet the relation between the polar vortex area and intensity is so complex.
北极海冰面积和北半球极涡面积为明显的正相关，而北半球极涡面积和极涡强度之间的关系就较为复杂。
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