中文摘要：

利用ECMWF提供的60层气象场资料诊断分析了2002/2003和2003/2004年两个冬季的爆发性增温（stratospheric sudden warming,SSW）过程,比较了两次SSW期间高纬温度和纬向风的差异,计算了SSW期间的EP通量和剩余环流。结果表明：2003/2004年增温持续时间长、强度大,而2002/2003年则发生了波动;增温都是从平流层上层开始向下传播,但是2003/2004年高层极涡崩溃后迅速恢复,低层极涡恢复得慢,2002/2003年极涡在高层和低层都是缓慢恢复;SSW期间行星波活动较多,2003/2004年极地EP通量的辐合引起东风长时间持续从而阻止了行星波再次上传,而2002/2003年行星波则发生多次上传;2002/2003年SSW发生时高纬地区为下沉气流,没有形成环流圈,增温后形成逆时针的环流圈比2003/2004年偏低。

英文摘要：

The stratospheric sudden warmings（SSW） in 2002/2003 and 2003/2004 winters are analyzed using the daily four times ECMWF data.The differences of the average temperature and zonal wind are compared between these two winters,with calculating EP flux and the residual mean circulation.The results show that there are several times warming during 2002/2003 winter and a long time persistent warming in 2003/2004.The high level pole vortex recovers quickly and the lower one slowly after breakdown in 2003/2004,whereas both the high and lower level ones recovering slowly in 2002/2003.The persistent easterlies,induced by EP flux convergence in the pole,prevent the propagating upward of planetary wave in 2003/2004,whereas many times propagation upward taking place in 2002/2003.Besides,the residual mean circulation indicates that the circulation is the downwelling in the high latitude while SSW taking place,with no circulation circle forming in 2002/2003.The reverse circulation circle after SSW in 2002/2003 is lower than that in 2003/2004.