【摘要】 本文采用詹金斯的谱分析方法,计算了我国160个代表站月降水量资料的自谱值,揭示出我国近30年来降水振荡主要周期及其分布特征.结果表明:我国西部地区(110°E以西),主要周期相对地集中在31.4—39.0个月之间,表现出以准三年振动为主;而我国东部地区(110°E以东),主要周期集中在21.2一29.2个月之间,表现出以准两年振动为主.特别是通过对青藏高原以东地区降水振荡主周期及其分布特征的分析,为我国雨带类型的区域划分范围提供了比较充分的依据,并为长期预报提供重要的气候背景.更多还原

【Abstract】 By utilizing the spectral method proposed by G. M. Jenkins, the selfspectrographic analysis was made of monthly rainfall amounts of 160 main rainfall stations. The results indicate the main period and distribution of precipitation oscillation during the past 30 years. To be specific, in the west of China (west of 110°E), the periods of precipitation oscillation are usually between 31.4-39.0 months, representing a quasi-three year period, distributed mainly over the southeast and northeast of the Qinghai-Xizang Plateau; in the east of China, the periods are usually between 21.2-29.2 months, representing a quasi-two year period, distributed mainly over the centre and south of Northeast China, the Huaihe River Valley and south of the Changjiang River.更多还原