From 1961 to 2006, polar vortex area in the northern hemisphere decreased, and the polar vortex area index was positively correlated with the number of stong wind days.
1961年到2006年,北半球极涡面积呈减少趋势,极涡面积指数与东北地区大风日数呈正相关。
参考来源 - 中国东北地区风的气候变化特征及大风的成因研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The polar vortex is a system of wintertime winds.
极地涡旋是冬季风形成的一个风系。
"You had a whole part of the US affected by the Polar Vortex this year, which made stepping outside impossible," he says.
他说：“今年整个美国都受到极地气旋的影响，完全不可能到户外。”
In winter the center of the polar vortex locates about the north of pole, but in summer it shifts to the western hemisphere.
冬季的极涡中心基本位于极心附近偏北的位置，而夏季极涡中心则明显移向西半球。
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