摘要
东亚中高纬度东北冷涡持续活动是北半球大气环流异常持续或调整的重要表征。选择10个初夏(6月)冷涡活动强、弱和正常年为典型个例年,对其4~6月500 hPa高度场沿45°N纬圈进行谐波分析合成表明:在冷涡活动强和弱年中高纬度东北冷涡活动区的上下游均有比较稳定的阻塞流(超长波脊)和超长波槽存在,而冷涡活动正常年则超长波槽脊的位相变动很大;冷涡活动强年的下游北太平洋长波槽和上游的阻塞流比冷涡弱年的超长波槽和阻塞流偏西;冷涡强年6月份的冷涡活动区长波槽位相占优,而冷涡弱年的6月份则长波脊位相占优。
The activity of cold vortex in the North-East China is a major character of the general circulation of atmosphere in North hemisphere.Analysing the activity of a series of typical years that the cold vortex acted both strongly or weakly in the early summer(i.e.June) through researching the harmonic analysis of height on 500 hPa during April to Jun,it can be found that the untra-long wave and block pattern(i.e.the ridge of untra-long wave)appeares not only in upstream regions but also in downstream regions of cold vortex activity during both the strongly active year and the weakly active year.Whereas,it can not be found in either region of cold vortex activity.In strong active years the location of the untra-long wave trough and block pattern is westward than weak active years.During strong active years,the pattern of untra-long wave trough predominates in the early summer of June,but during weak active years,the ridge of untra-long wave predominates in the same time.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2008年第S1期204-208,共5页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金面上项目(40275019,40575047,40705036)
关键词
初夏东北冷涡
中纬度
谐波分析
阻塞流型
cold vortex in early summer
middle latitude
harmonic analysis
block pattern
