东半球500hPa闭合低压系统的统计分析

THE STATISTICAL STUDY OF EAST HEMISPHERE 500 HPA CLOSED CYCLONE

中文关键词:  500hPa闭合低压  统计研究  气候规律

英文关键词:500 hPa closed cyclone  Statistical study  Climatic rule

中文摘要:

      通过分析500hPa东半球闭合低压系统,研究其气候规律。低压活动次数有年际、月际、季际变化。低压活动于中高纬度带,主要集中于两大地区,第一区是西太平洋及大陆东岸,第二区是东欧地区。第一区中心夏季向西移到大陆上,强度增大,对中国气候有重要作用。低压中心高度值的频数分布是双峰型。低压生命期比阻塞高压还长些。强低压主要出现在大陆高纬地带和西太平洋。强发展的低压多数出现在西太平洋。亚洲低压移动路径有两条,一条从西西伯利亚北部到库页岛,一条从咸海东移到库页岛。

英文摘要:

      Based on 10-year(1981-1990) historical weather maps(prepared by Beijing Meteorolo gical Center),the statistical study of East Hemisphere 500 hPa closed cyclone is presented.The results indicate that the frequency of cyclones has inter-annual variability and inter-monthly change.The closed cyclones are concentrated on two large areas: Asian East Coast-West Pacific and East Europe.The center of the firstarea shifts to a more western position in the summer than in the other seasons and its frequency increases.The frequency distribution of cyclone center heights appears in a two-peak type.The cyclone life cycle is longer than that of blocking high.The deep cyclones tend to appearin the regions of A sia-European mid-high latitude and West Pacific.The intensely devoloped cyclones appearin the region of West Pacific.The cyclones in Asia have two pathes:the northwestern and the western.