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In this paper, the index of polar vortex position is introduced. This index can preferably describe the variability of mid-high latitude circulation anomaly. 本文给出的极涡位置指数能较好地描述中高纬度环流异常的变率。
Before middle age of 1970s, area and intensity index of northern polar vortex trend to rise, with small fluctuating, and after that, with clear undulating, it trend to minish. 上世纪70年代中期之前极涡面积、强度基本为上升阶段，之后为下降阶段。