西南极地区极地气旋路径的统计分析  

A STATISTICAL ANALYSIS OF CYCLONE TRACKS IN WEST ANTARCTIC REGION

作　　者：陈善敏 张遴煜 逯昌贵 

机构地区：[1]国家气象局天气司 [2]气象科学研究院极地气象研究室

出　　处：《气象科学研究院院刊》1989年第2期150-155,共6页

摘　　要：本文对影响西南极地区·的极地气旋移动路径进行了统计分析。按气旋移动和影响天气的特点将极地气旋的路径分为正面影响南极半岛北端、偏南路径和偏北路径三类,统计了气旋移动路径频数分布和高频数气旋移动的主路径以及极地气旋的源地。分析了极地气旋路径的季节特征,夏季极地气旋活跃,气旋数偏多,冬季气旋数较少,而过渡季节接近平均数。气旋移动平均速度为每天14.4经度(29.9km/h)。冬夏差别不大,过渡季节平均移速明显加快。还注意到许多极地气旋移至南极半岛两侧的别林斯高晋海和威德尔海域时,移速有所减慢,常出现回旋或停滞。气旋穿过南极半岛地区时,移速加快,常出现“跳跃”现象,而在气旋穿过德雷克海峡时,移动速度更快。The paper shows the statistical analysis of cyclone tracks that have influence on the WestAntarctic region.Based on the conditions of cyclone movement and their impact on the weather,cyclone tracks are classified into three categories:* moving towards the northern tip of the Antarctic Peninsula* southern tracks* northern tracksMoreover,in this paper,the frequency distributions of cyclone tracks,the main tracks withhigher frequencies and the origin region of Antarctic cyclones have been analyzed.The analysisof the seasonal features of Antarctic cyclones shows that there is higher frequency of cyclone oc-currence in summer,whereas relatively lower frequency in winter,and the cyclone number inother seasons is close to the climatological normals.The analysis also shows that the Antarctic cy-clones obviously speed up during the transitional seasons.When cyclones move into both sides ofAntarctic Peninsula,i.e.into Bellingshausen Sea and Weddell Sea,the cyclones tend to slowdown,quite frequently loop aroud or even stagnate.However,when cyclones pass through thePeninsula from the east,they tend to accelerate and quite often“jump”over the Peninsula.As cy-clones pass through the Drake passage,they appear to travel at even higher speed.

关 键 词：极地气旋 移动路径 别林斯高晋 移速 气旋活动 南极半岛 德雷克海峡 地区时 极地区 气旋生成 

分 类 号：P4[天文地球—大气科学及气象学]