【摘要】 利用欧洲预报中心６月份北半球５００ｈＰａ高度网格点资料，运用时－空谱分析方法，研究了梅雨期大气环流演变基本特征，对丰梅年和枯梅年的时－空谱特征作了对比分析，枯梅年驻波、东进波及西退波的最大谱峰中心所在的波长大于丰梅年时的波长。并且丰梅年东进波时－空谱分布双峰型特征明显。更多还原

【Abstract】 Based on the method of time-space spectral analysis,some significant knowledge from 500hPa height fieldof Northern Hemisphere in June during 1983～1992 was obtained.Most energy of single wave is mainly lo-cated in range of ultra-long and long waves. Through analysing the difference between the processes of thehigh and dry mold rains,it is well known that the wave length of the largest energy on the high mold rains isshorter than that of dry mold rains,and the wave lengthes lie in ultra-long wave field.更多还原