7—9月500百帕高度场30—50天振荡的遥相关结构及其演变特征
投稿时间:1989-09-25    点此下载全文
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作者单位
徐建军 南京气象学院气象学系 
林春育 南京大学 
基金项目:国家自然科学基金
中文摘要:利用1982、1983年7—9月的欧洲中期天气预报中心(ECMWF)网格点资料,分析了北半球中高纬度以及热带地区500百帕高度场的30—50天周期振荡的遥相关结构及其演变特征。发现30—50天周期振荡的分布,在热带与对流活动中心相对应,在中高纬地区与主要的气压活动中心相配合。振荡的相关中心分布于15—70°N之间,并成大弧状排列,具有波列的结构特征,其路径具有显著的年际变化,其弧状排列的振荡中心具有纬向移动,移动方向与高度场振荡位相的纬向移动相一致,高度场振荡的纬向移动和波列的能量频散密切相关。
中文关键词:位势场  30-50天振荡  遥相关
 
TELECONNECTION AND TIME-VARIATION OF 30—50 DAY OSCILLATION OF THE 500hPa HEIGHT FIELD DURING JULY-SEPTEMBER
Abstract:By using July-September grid data of 1982 and 1983 from the ECMWF, the teleconnection structure and time-variation of 30-50 dayoscillation of the 500 hPa height field in the northern extratropics and tropics are examined. It is found that the distribution of 30-50 dayoscillation is correlated with the centers of convective activities inthe tropics and with the major centers of the pressure system in the extratropics. The correlation centers of the oscillation are distributed between 15-70°N and arranged in the form of a big are with structural characteristics of a wavetrain and prominent annual variability on their propagation track. The zonal propagation of the oscillation centers corre-sponds to that of the oscillation phase of the height field, which is closely correlated with the energy dispersion of the wave train.
keywords:geopotential field  30-50 day oscillation  teleconnection
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