摘要
本文利用1981年和1982年冬季的欧洲中心(ECMWF)网格点带通滤波资料,分析了北半球中高纬度和热带地区500hPa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,在中高纬度地区与主要的大气活动中心相配合,而在热带与对流活动中心相对应。振荡的相关中心呈多段大弧状的波列结构特征,中低纬振荡通过波列的能量频散联系起来。波列的纬向移动和高度场振荡的位相纬向传播的方向是一致的。
With the grid data of winter of 1981-1982 from ECMWF, the teleconncction and evolution feature of 500hPa contour field with 30-50 day time scales over middle-high latitudes and tropical-regions in Northern Hemisphere winter are studied by using the method of bandpass filter. It has been found that, the distribution of 30-50 day period oscillation of the contour field is associated with the principal atmospheric activity centres over middle-high latitudes and corresponding to the convective activity centres, the wavetrain centre has latitude-longitude propagation, and at the same time the propagation direction of wavetrain has interannual change. The zonal propagation direction of height field oscillation is consistent with that of wavetrain.
出处
《气象科学》
CSCD
北大核心
1991年第1期11-20,共10页
Journal of the Meteorological Sciences
基金
国家自然科学基金
国家气象局季风科研基金联合资助
