摘要
利用NCEP/NCAR再分析月平均风场资料和国家气候中心提供的中国160个气象站的月平均气温资料,用质量流函数计算方法描述平均经圈环流,用环流中心值大小表征其强度,分析Hadley环流强度1951-2010年的趋势变化及其与我国中东部气温的关系。结果表明:1)质量流函数能很好地表征平均经圈环流的特征,且环流中心值大小能形象地反映环流强度。2)近60 a来,冬季北半球Hadley环流强度呈线性增强的趋势;夏季南半球Hadley环流在20世纪80年代初发生了由减弱趋势转变为显著增强趋势的年代际转折。3)我国中东部大部分地区气温的年代际变化能很好地被Hadley环流强度变化所解释,二者基本呈正相关关系,但显著相关区域随季节变化有所不同。
Based on the NCEP/NCAR reanalysis monthly wind data and 160 meteorological stations temperature data provided by National Climate Center, the mass stream function scheme and circulation center value were used to analyze Hadley circulation intensity changes from 1951 to 2010 and their relations with temperature in middle and eastern China. The results are as follows. 1） Mean meridional circulation can well be described by mass stream function, and circulation center value can represent its in- tensity vividly. 2） During the past 60 years, the intensity of boreal Hadley cell in winter tends to stronger, while the southern Hadley cell in summer shows interdecadal change from weakening trend to significant increasing trend in 1980s. 3） The interdecadal change of temperature in middle and eastern China could be explained well by changes of Hadley circulation intensity, and there exist some positive correlation between them. High related areas are changed with the season.
出处
《气象与环境科学》
2012年第2期61-66,共6页
Meteorological and Environmental Sciences
基金
福建省气象局2010年度青年课题(2010Q07)资助
关键词
质量流函数
平均经圈环流
变化趋势
气温
相关分析
mass stream function
mean meridional circulation
change trends
temperature
relevant analysis
