【摘要】 本文首先提出了一个划分秋雨区的新标准,利用华西地区1951—80年的气候整编资料,将华西秋雨区分为典型区、准典型区和一般区。在三个区中各选一代表站,以此讨论各个区的特点。在此基础上研究了华西秋雨的起止日期以及与秋季大气环流的关系,并且用谐波分析等方法研究了华西秋雨的周期变化。更多还原

【Abstract】 This paper discusses autumn rain in West China in terms of climate.The climatic data in West China during 1951 to 1980 are used to divide autumn rain region in West China into three classes.,typical,sub-typical and general areas.The beginning and ending dates of autumn rain in West China are de- fined.The beginning and ending dates correspond to two sudden changes in atmospheric circulation from summer to winter.Bassed on the mean rainfall of 40 stations selected in the autumn rain region,the cyclic changes in the last thirty years are studied with the method of harmonic analysis.更多还原