1948—2004年全球平均Hadley环流强度指数与特征  

Global Mean Hadley Circulation Intensity Index during 1948—2004 and Its Characteristics

作　　者：张俊[1] 谷德军[2] 施能[1] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044 [2]中国气象局广州热带海洋气象研究所,广东广州510080

出　　处：《南京气象学院学报》2007年第2期231-238,共8页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40275028);热带气象科学研究基金项目(2005003);中国气象局热带季风重点开放实验室项目

摘　　要：利用NCEP/NCAR逐月平均风场资料,研究了全球平均Hadley环流特征。利用3层4个关键区的风定义并计算了1948年1月—2004年12月的全球纬向平均的南/北半球和全球Hadley环流逐月强度指数。结果表明:计算的Hadley环流指数可以合理地表示Hadley环流的强度;北半球Hadley环流除7—9月(南半球除5月)外都呈增强趋势;南/北半球的年平均Hadley环流也是增强的。年际相关分析表明:Hadley环流指数与SOI有非常高的负相关,Hadley环流强度的年际变化与ENSO关系密切。The characteristic of global zonal mean Hadley circulation has been investigated by using the NCEP/NCAR monthly wind reanalysis data from 1948 to 2004. The intensity index of Hadley circulation is defined and calculated by using the 3 levels wind data in 4 key regions for the southern/northern hemisphere and the global. Results indicate that the index calculated can represent the Hadley circulation intensity reasonably. The monthly Hadley circulation indices showed an increasing trend in the northern hemisphere except for the months from July to September, in the southern hemisphere except for May. The yearly averaged indexes were both increased obviously over the southern and northern hemisphere. Interannual correlation analysis shows a significant negative correlation between Hadley circulation index and SOI. The interannual variation of Hadley circulation intensity was close related with ENSO.

关 键 词：经圈环流 HADLEY环流 SOI ENSO 

分 类 号：P434[天文地球—大气科学及气象学]