热带地区低层风场几种周期振荡的分析

Analysis of Several Kinds of Periodic Oscillation of the Low Level Wind Field in Tropical Region

本文对1983年5—7月(90°E—90°W,50°N—40°S)广阔区域中850hPa纬向风(u)的周期振荡做了功率谱及交叉谱分析。对同年5—9月资料做了EOF分析。着重讨论了中期以上几种周期振荡(40天、26天、13天)的分布特征及位相传播。并且分析了40天周期振荡与大气环流和海况季节转变之间的联系。

The periodic oscillations of the 850 hPa zonal wind in the broad domain 90°E-90°W and50°N-40°S in May-July 1983 are analysed by means of the power and corss apectrum.For May-September in the same year,the EOF analysis had been carried ort.The distribution and the phase propagation of several periodic oscillations (40 day,26.7 day and 13.3 day)are discussed,and the correlation between the different periods in the different region and the weather system is also analysed.