摘要
根据IAP9LAGCM 1 0年积分 85 0hPa纬向风的逐日输出结果 ,应用Morlet小波分析方法 ,研究了该模式中的大气季节内振荡 (MJO) ,结果表明该模式能抓住热带MJO的基本时空特征 ,模式中MJO的显著周期为 36天 ;另外还分析了 1 6～ 64天重构信号的时间经度剖面图 ,发现该MJO为东传 ,这与实际较一致 ;最后用EOF方法分析了模式大气中 85 0hPa 5天平均速度势 ,揭示出该MJO在全球表现为行星尺度 1波和 2波的特征。
With the day-to-day data of 850 hPa zonal wind using IAP9L AGCM of the integration period of 10 years, by applying the method of Morlet wavelet analysis, we have investigated temporal and spatial features of Madden and Julian Oscillation(MJO). It is shown that the model can describe the basic MJO feature of tropical lower-troposphere, the good correlation coefficient of cycle and propagation direction between the model output, In the latter, using the 850 hPa velocity potential of the EOF analysis model, we have found that MJO have the character of one wave and two waves in planetary scale of global area.
出处
《气候与环境研究》
CSCD
2004年第4期567-574,共8页
Climatic and Environmental Research
基金
国家自然科学基金资助项目 40 2 3 3 0 2 7资助
关键词
大气环流模式
大气季节内振荡
时空特征
general circulation model
Madden and Julian oscillation
temporal and spatial characteristics
