低频涡动、高频涡动在阻塞过程中的作用

THE ROLE OF LOW FREQUENCY AND HIGH FREQUENCY EDDIES IN THE DEVELOPMENT, MAINTENANCE AND DECADENCE OF A BLOCKING

利用ECMWF/WMO客观分析资料,通过低通滤波和高通滤波,详细地计算了1985—1986年冬季发生在欧洲—乌拉尔地区的一次阻塞过程低频涡动和高频涡动的矢量及矢量散度,并且计算了阻塞维持过程中高频涡动的涡度通量散度。通过分析和讨论阻塞形成、维持和衰亡过程中低频涡动和高频涡动的矢量型以及高频涡动对阻塞流型的强迫作用,得到了若干有意义的结果。

Based on ECMWF/WMO data and using low pass and high pass filtering tech niques,the E—vector and its divergence of the low frequency and high frequency eddies in a blocking occurring in Europe—Ural during the winter of 1985—1986 are investigated in much detail. The vorticity flux divergence of the high frequency eddies in the maintenance of the blocking is also discussed. Some useful results are thus acquired.