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polar front 【氣象學】極鋒。

polari-

Chen et al noted that there are three kinds of landfall typhoon tracks ; 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 陳聯壽等根據( 1949 - 1976 )年資料,指出:登陸臺風路徑可分為三類;副熱帶高壓和極鋒是影響熱帶氣旋陸地路徑的主要天氣系統,它們的演變和調整會影響熱帶氣旋的移向。

Below 600hpa , the front of east asia was mei - yu front ; mei - yu equatorial front and polar front from the south to the north ; while above 600hpa , there was only mei - yu front . upon these conclusions , we put forward a conception model of east - asia front 在600hpa以下,東亞地區的經向方向鋒區從南到北依次表現為梅雨鋒,梅雨赤道縫和極鋒;而在600hpa以上,只是極鋒型的梅雨鋒的單一結構。

( 4 ) 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 ( 4 )東北汛期降水與西南夏季風、北方冷空氣、副熱帶高壓、極鋒急流、前期冬季環流異常密切相關。