季节的极涡中心强度是持续的。
CAM可以用来对极涡进行模拟研究。
极涡中心位置主要偏向亚洲大陆及太平洋一侧。
The center of polar vortex mainly displace towards Asia land and the Pacific.
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。
The oscillation of polar vortex area over Eurasia propagates separately eastward and westward.
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。
In this paper, the index of polar vortex position is introduced. This index can preferably describe the variability of mid-high latitude circulation anomaly.
极涡是该区域四季存在、冬强夏弱、向上延伸至平流层下部的基本环流系统。
Polar vortex is a basic circulation system which exists in every season (strong in winter and weak in summer) and can extend to the lower level of stratosphere.
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。
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.
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。
For the polar vortex area on the Northern Hemisphere, in summer the polar vortex boundary withdraw about 30 latitudes than winter.
一些学者已通过平流层和对流层耦合机制的研究探索极涡变化对低层环流的作用。
The mechanisms coupling the stratosphere and troposphere have been studied by some scientists for understanding the effect of the polar vortex change on the lower circulation.
在前期环流演变中发现极涡、东亚槽、副高等对梅雨的丰枯亦有较好的预兆反映。
Besides, the evolutions of the polar vortex, the trough over Bast Asia and the subtropical high prior to Mei-Yu period are also related to the precipitation during Mei-Yu period.
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。
In winter the center of the polar vortex locates about the north of pole, but in summer it shifts to the western hemisphere.
中平流层环流转型与对流层重要系统(极涡、西太平洋副热带高压)存在一定关系。
The relation between the transition dates in middle stratosphere and the important systems in troposphere such as polar vortex and the subtropical high in West Pacific.
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。
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.
结果表明，近45年西太平洋副高与极涡强度都趋加强，纬向环流趋于加强，经向环流则趋减弱。
It turns out that for the past 45 years or so the western Pacific subtropical highs and polar vortices were intensified, and so were zonal circulations as opposed to meridional ones.
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。
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.
同时准定常行星波冬季向上传播至平流层并与平流层极涡相互作用从而也影响了北极涛动在北极的活动中心。
Meanwhile, planetary waves propagating upwards also affect the polar vortex in the stratosphere, and then affect the Arctic centers of action of the AO.
其中西伯利亚高压、极涡的位置、东亚大槽的强弱、极锋急流都差异显著，从而导致大连地区冬季气温的异常。
Moreover, it is found that Siberia High, East Asian Trough, Polar Front Jet and the location of Polar Vortices are notable different, causing winter temperature anomalies in DaLian.
其中西伯利亚高压、极涡的位置、东亚大槽的强弱、极锋急流都差异显著，从而导致大连地区冬季气温的异常。
Moreover, it is found that Siberia High, East Asian Trough, Polar Front Jet and the location of Polar Vortices are notable different, causing winter temperature anomalies in DaLian.
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