江淮流域夏季降水的准两年振荡特征及其关联因子分析  

Characteristics of the quasi-biennial oscillation of the summer precipitation over Yangtze-Huaihe Valley and its correlation factors

作　　者：张璟[1] 智协飞[1] 缪锴 罗晓蔚 

机构地区：[1]气象灾害教育部重点实验室(南京信息工程大学),江苏南京210044 [2]内蒙古额济纳旗气象局,内蒙古额济纳旗735400

出　　处：《大气科学学报》2014年第5期541-547,共7页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41175078);江苏省高校优势学科建设工程资助项目(PAPD);江苏省普通高校研究生科研创新计划项目(CXZZ13_05)

摘　　要：利用1951—2010年我国江淮流域11个测站夏季(6—8月)降水资料和NCAR提供的北半球月平均海平面气压场资料以及相关的西太平洋副高指数资料,采用Morlet小波变换、交叉小波变换及相关分析等方法讨论了降水准两年振荡现象的年际变化规律及其与东亚夏季风、副高的关系。结果表明,准两年振荡分量在江淮地区夏季降水场的年际振荡中十分重要,且经历了由强到弱再到强的变化过程;同时降水与夏季风强度及副高脊线位置的准两年变化均存在较好的同期相关,彼此间的相互影响还体现在年际尺度上,并分别在4 a和1 a时间尺度上有明显的滞后、超前关系。Based on the summer( June—August) precipitation data from 11 stations over Yangtze-Huaihe valley from 1951 to 2010,the northern hemisphere mean sea level pressure field data provided by NCAR and the west Pacific subtropical high indexes,the interannual variability of the quasi-biennial oscillation(QBO) of the summer precipitation and its relationship with east Asia summer monsoon and west Pacific subtropical high were discussed by using Morlet wavelet transform,cross wavelet transform and correlation analysis method. The results showed that QBO component was very important in the interannual oscillation of summer precipitation field in Yangtze-Huaihe region,which experienced a course of changing from strong to weak,and then to strong again. In addition,the contemporaneous correlation between precipitation and QBO of summer monsoon intensity as well as subtropical high ridge was good. Their mutual impact was also shown in the interannual scale and there was obvious lagged and leading correlation respectively in four-year and one-year scales.

关 键 词：江淮流域夏季降水 准两年周期振荡 东亚夏季风 西太平洋副热带高压 

分 类 号：P426.6[天文地球—大气科学及气象学]