三峡库区夏季降水基本气候特征  

PRIMARY CLIMATIC CHARACTERISTICS OF SUMMER PRECIPITATION IN THE THREE-GORGES RESERVOIR REGION

作　　者：周毅[1] 高阳华[2] 段相洪 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044 [2]重庆市气象局,重庆401147

出　　处：《西南农业大学学报（自然科学版）》2005年第2期269-272,共4页Journal of Southwest Agricultural University

基　　金：重庆市科委科技攻关资助项目(98-5363)

摘　　要：利用三峡库区44个观测站43 a夏季降水资料,采用经验正交分解法(EOF)、小波变换等方法,对三峡库区夏季降水基本气候特征进行研究,结果表明:三峡库区夏季降水一致性较好;20世纪50年代后期、60年代初期及70年代为少雨期,80年代初期为多雨期,而80年代后期至今,有准2 a多雨、少雨振荡的特征;近43 a三峡库区夏季降水存在2～3 a,6～7 a及15 a左右的周期;旱年出现的频率明显高于涝年;三峡库区夏季降水存在明显的年代际变化特征.The methods of EFO and wavelet transformation were adopted to analyze the primary climatic characteristics of summer precipitation in the Three-Gorges Reservoir Region, based on the data of 43 years of local precipitation in summer. Summer precipitation in this region exhibited fairly good regularity. The late 50', early 60' and 1970' were dry periods, the early 80' was a wet period and since then a two-year cycle of alternate wet and dry years was shown. The frequency of drought-stricken year was higher than that of flood-affected year. Summer precipitation in this region is characterized by an interdecadal fluctuation.

关 键 词：三峡库区 夏季降水 周期 年代际 小波变换 

分 类 号：P426.61[天文地球—大气科学及气象学]