摘要
利用NCEP/NCAR1948-2010年再分析资料,采用小波分析,M-K突变检验及相关性检验等方法,研究了青藏高原南侧10°-30°N低层前季风环流的气候、结构特点、突变及周期等特征,以及与西南地区降水的关系.结果表明:该环流4月最强,且为低纬地区冬季Hadley环流型和夏季季风环流型间的一种过渡.该环流第一主周期为23a,同时还存在4,7,13a的主周期.20世纪80年代该环流的减弱是一突变现象,具体是从1982年开始的.前季风环流强度与西南地区大部4月平均降水量呈正相关,且四川东部、重庆西部、贵州中部通过了99%的信度检验.
Based on the NCEP/NCAR reanalysis data,the climatic and the structural characteristics and the periodicity of the Pre-Monsoon Circulation on the south side of the Tibetan Plateau have been studied by wavelet analysis,M-K method,and correlation test.Results show that the strongest Pre-Monsoon Circulation happens in April,and it is the transition of the Hadley Circulation and the Monsoon Circulation.The first main cycle is 23 years,and there are 4years,7years and 13 years.A weakened phenomenon of Pre-Monsoon Circulation happened in the 1980 s,and it started in 1982.The Pre-Monsoon Circulation has a significant correlation with monthly mean precipitation over east of Sichuan Province and west of the Chongqing in April.
出处
《西南师范大学学报（自然科学版）》
CAS
北大核心
2015年第10期106-112,共7页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金项目(41275079)
关键词
前季风环流
青藏高原
气候特征
相关系数
西南地区
Pre-Monsoon
the Tibetan Plateau
climate characteristics
correlation coefficient
Southwest China
