东半球夏季低空越赤道气流的年际变化  

Interannual Variation of Summer Cross-Equatorial Flow in Lower Troposphere of Eastern Hemisphere

作　　者：唐碧[1,2] 郭品文[1] 杨丽萍[1,3] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]中国气象局上海台风研究所,上海200030 [3]杭州市气象局,浙江杭州315000

出　　处：《南京气象学院学报》2009年第2期298-305,共8页Journal of Nanjing Institute of Meteorology

基　　金：江苏省气象灾害重点实验室开放课题

摘　　要：利用1948—2006年NECP/NCAR的风场、高度场、海平面气压场以及地表温度再分析资料,采用相关分析、合成分析及回归分析等方法,探讨了东半球夏季低空越赤道气流的年际变化特征以及越赤道气流强度与环流系统和前期海陆热力差异的关系。结果表明,越赤道气流强度的年际变化和同期南北半球低纬环流系统,特别是亚澳大陆气压差关系密切。此外,索马里急流和孟加拉湾越赤道气流受海陆热力差异的影响,而东亚越赤道气流则主要受海温影响。Based on the NCEP/NCAR wind field,height field,sea-level pressure and surface temperature reanalysis data from 1948 to 2006,the linear correlation analysis,composite analysis and regression analysis are used to study the interannual variations of the cross-equatorial flows（CEFs） in the lower troposphere of Eastern Hemisphere in summer and the correlations between the cross-equatorial flow intensity and circulation system,and the preceding sea-land thermal difference.Results show that there are close relationships between the interannual intensity changes of the cross-equatorial flows and the low-latitude circulations in Southern and Northern Hemispheres,especially the Asia-Australia pressure difference.Besides,Somali jet（SMJ） and Bay of Bengal CEF are significantly influenced by the sea-land thermal difference,while Eastern Asian CEF is remarkably affected by the sea surface temperature.

关 键 词：越赤道气流 年际变化 低纬环流 海陆热力差异 

分 类 号：P425.43[天文地球—大气科学及气象学]