大气科学学报2011，Vol.34Issue(4)：476-483,8.
中平流层环流转型日期气候及异常特征
The climate and anomalous characteristics of the transformation date of middle stratosphere circulation
摘要
Abstract
We calculated the coefficient（A02） of cosine Spherical harmonics by using the NCEP/NCAR middle stratosphere（10—70 hPa） reanalyzed daily height field data from 1958 to 1997.Then we derived the transformation date of middle stratosphere circulation from cyclone to anticyclone on the basis of the date when A02 converted steadily from negative to positive.The result shows that：1）The 20 hPa circulation first transformed from cyclone to anticyclone（averagely on April 24） and then the same occurred at 70 hPa 54 days later,thus the whole middle stratosphere was in summer;2）There is notable interdecadal variation in the transformation date at 50 hPa and 70 hPa.Our study shows that there exists remarkable correlation relationship between the transition date of circulations at 50 hPa and 70 hPa and the quasi-biennial oscillation（QBO） of the low-latitude stratosphere zonal wind.关键词
中平流层环流转型/年代际变化/准两年振荡Key words
transition of middle stratosphere circulation/interdecadal variation/the quasi-biennial oscillation分类
天文与地球科学引用本文复制引用
闵凡花,王盘兴,夏佰成,陈长胜,罗璇..中平流层环流转型日期气候及异常特征[J].大气科学学报,2011,34(4):476-483,8.基金项目
国家科技支撑计划项目 （）
重庆市气象局重点课题 （）
