摘要
本文根据北半球500hPa高度场30年(1951—1980)平均的逐候格点资料,对气候平均的东亚各主要大气环流系统的年内变化进行了谐波分析和天气学分析.结果表明,东亚大气环流系统存在着三种主要的大气低频波:年波、半年波和30—50天的季内波;中、高纬度的大气环流以年波振荡为主,低纬度的大气环流以半年波振荡为主;30—50天的季内波是北半球各纬度上都存在的一种波,但它对总方差的贡献在低纬比中、高纬度大.此外,还讨论了年波和半年波这两种大气低频波与我国长期预报中常用的各种韵律指标特别是隔季相关现象的关系.
In this paper, We will study the lwo-frequency fluctuation on time scale of and less than one year to improve the annual long-range forecast in China .Based on the long- term mean 500 hPa geopotential height, we calculated amplitudes from annual wave to monthly wave and their contributions to the total variance .The results indicate that the annual wave,six month wave and 30 - 50 day wave contribute most to the total variance, while other waves are much smaller in amplitude . We also pointed out that the rhythmic phenomena are related to the annual and semiannual fluctuations of the atmospheric circulation over East Asia .
出处
《大气科学》
CSCD
北大核心
1992年第3期333-338,共6页
Chinese Journal of Atmospheric Sciences
关键词
大气环流
低频振荡
韵律
Low - frequency fluctuation
Rhythm
Relation of every two seasons .
