副热带高压脊线移动的三维结构特征

THREE-DIMENSIONAL STRUCTURAL CHARACTERISTICS ON THE MOVEMTENT OF SUBTROPICAL RIDGE LINE

中文关键词:  副热带高压脊线  三维结构  季节变化  年际变化

英文关键词:Subtropical high ridgeThree-dimensional structure  Seasonal variation  Interannual variation

中文摘要:

      文中定义了东西风交界面作为表征副热带高压脊线位置的动力学参量,并利用NCEP/NCAR再分析月平均资料在三维空间中考察了东西风交界面的空间、时间变化特征.分析结果表明:副热带高压位置移动以季节变化为主,季节变化由南北移动和斜率变化两类运动组成;副热带高压位置移动的年际变化和ENSO事件关系密切;南半球副热带高压具有纬向对称的垂直结构,北半球副热带高压垂直结构较为复杂,尤其是西太平洋副热带高压表现出在全球副热带高压系统中的独特性.

英文摘要:

      The boundary between east wind and west wind (WEB) was definded as the dynamical parameter of describing subtropical high ridge location.Based on NCEP/NCA Rreanalysis monthly mean data the spatial and temporal variation charact eristrics of WEB were investigated.The results show that the seasonal variation of WEB,consisting of the movement of latitude location from south to north or from north to south and its slope change,is the main part in the movement of the subtropical high ridge.The annual variation of subtropical high ridge is associated with ENSO intimately.The subtropical high in the Southern Hemisphere is longitudinally symmetric vertical structure,but in the Northern Hemisphere,its vertical structure is more complex.The west Pacific subtropical high ridge presents unique feature in the global subtropical high ridge system.