Hadley环流的年际和年代际变化特征及其与热带海温的关系  

Interannual and interdecadal variations of the Hadley circulation and its connection with tropical sea surface temperature

作　　者：周波涛[1] 王会军[1] 

机构地区：[1]中国科学院大气物理研究所竺可桢-南森国际研究中心

出　　处：《地球物理学报》2006年第5期1271-1278,共8页Chinese Journal of Geophysics

基　　金：中国科学院知识创新工程主要方向性项目(KZCX3-SW-221);国家自然科学基金项目(40221503)资助

摘　　要：利用NCEP/NCAR再分析风场资料和NOAA海表温度(SST)资料,分析了冬、夏季Hadley环流的变化特征及其与热带海温在年际、年代际尺度上的关系.结果表明,冬季北半球Hadley环流强度具有明显的年际和年代际变化,同时还呈现出明显的增强趋势.伴随着Hadley环流的加强,环流中心位置南移,高度上升;夏季南半球Hadley环流变化主要表现为强、弱、强的年代际振动,没有明显的线性趋势.研究还显示冬季Hadley环流与Nino3区SST正相关,这种相关性具有年代际变化特征.年际尺度上,冬季北半球Hadley环流与Nino3区SST正相关;夏季南半球Hadley环流与Nino3区SST负相关,即当赤道中东太平洋SST异常偏暖(冷)时,冬、夏季Hadley环流变强(弱).The variations of the Northern Hemispheric Hadley circulation in winter and the Southern Hemispheric Hadley circulation in summer and their connections with tropical sea surface temperature （SST） on interannual and interdecadal scale are studied by use of NCEP/NCAR wind data and NOAA SST data. It is indicated that the winter Northern Hemispheric Hadley circulation not only exhibits remarkably interannual and interdecadal variability, but also shows a positive trend. Accompanying the strengthened winter Northern Hemispheric Hadley circulation, its center shifts southward and its height ascends. The summer Southern Hemispheric Hadley circulation, lacking an obvious trend, exhibits decadal variations with strong, weak and strong pattern. The results also show that a positive correlation between the Northern Hemispheric Hadley circulation and the Nino3 region SST in winter exists, and this correlation changes on the interdecadal scale. It is also revealed that Nino3 region SST is positively correlated with the Northern Hemispheric Hadley circulation in winter and negatively correlated with the Southern Hemispheric Hadley circulation in summer on the interannual scale, which means when SST in the mid-east Pacific becomes warmer （colder）, both winter and summer Hadley circulations get stronger （weaker）.

关 键 词：HADLEY环流 年际变化 年代际变化 热带海温 

分 类 号：P461[天文地球—大气科学及气象学]