摘要
用球谐展开方法,综合考察了5—6月大型环流的纬向变化和经向变化特征,发现各层上平均大型环流的波谱特征不同,各层都能找到一个球谐波作为纬向波的代表;球谐波谱特征演变能反映出大气环流的6月突变,突变从100hPa扩展到500hPa,在500hPa表现最为明显;丰、枯年球谐波谱特征不同,优势波入梅前的位相及入梅后的转换波差异较大。
Comprehensive investigation is made of the longitudinal andlatitudinal variations in the large-scale circulation from May to Junein terms of spherical expansion.It is found that the spectrum featuresof the mean large-scale circulation are different at various levels anda spherical wave can be found as the sample for the longitudinal waveat each level. The variations in the features of spherical wave spectrumreflect the at mospheric circulation catastrophe in June, which developsfrom the 100hPa to 500hPa level, and is most significant at the 500hPa level. The characteristics of spherical spectrum are different in wetand dry years and there exists a pronounced difference between thephase of the predominant wave before the beginning of the Mei-yu season and the conversion wave after the period.
出处
《南京气象学院学报》
CSCD
1991年第3期300-307,共8页
Journal of Nanjing Institute of Meteorology
关键词
大气
波动
环流
候平均
the pentad mean
atmospheric oscillation
