极锋

第一极锋（PF1）位置的经向季节变化幅度远小于气候月平均零旋度线的经向季节变化幅度，但位于零旋度线的平均位置附近。

The magnitude of seasonally meridional migration in the location of the primary Polar Front ( PF1 ) is much less than that of the climatic monthly mean zero wind stress curl , but is near the mean position of zero wind stress curl .

副热带高压和极锋是影响热带气旋陆地路径的主要天气系统，它们的演变和调整会影响热带气旋的移向。

Subtropical high and polar front , whose evolutions and adjustments may modify typhoon movement , are the main synoptic systems which influence the track of landfall typhoon .

中纬度地区的气旋发源于极锋

Middle-latitude cyclones originate at the popar front .

指出北疆冬季降水偏多、偏少与欧亚中高纬环流特征有关，与新疆上空中纬度极锋锋区有关。

The results show that the abnormal precipitation in Northern Xinjiang in winter is related to the features of circulation in middle - high latitude over Eurasia and the polar frontal zone in middle latitude over Xinjiang .

东北汛期降水与西南夏季风、北方冷空气、副热带高压、极锋急流、前期冬季环流异常密切相关。

There exist close relation between the floods season precipitation in Northeast China and the anomalies of subtropical summer monsoon , the anomalies of cold air , Sub-tropical anticyclone , polar front jet , North hemisphere general circulation anomalies in winter .

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 .