大气科学2012，Vol.36Issue(4)：755-768,14.DOI:10.3878/j.issn.1006-9895.2012.11142
南半球环状模事件的准地转调整过程分析
Analysis of the Quasi-geostrophic Adjustment Process of the Southern Hemisphere Annular Mode
摘要
Abstract
The quasi-geostrophic adjustment process of the circulations associated with the Southern Hemisphere Annular Mode (SAM) is studied by employing the NCEP/NCAR reanalysis daily data.To SAM,which is a planetary scale system with the space scale along the latitude larger than the Rossby deformation radius,the wind field inclines to change itself so as to fit the pressure field in the process of geostrophic adjustment.The results show that the evolution of SAM lags behind the variation of the Ferrel cell anomaly about 2/16 phases,indicating the Ferrel cell changes the geopotential height anomalies in middle and high latitudes through its meridional transporting of the atmosphere mass.As the changing of the geopotential height anomalies in middle and high latitudes means the temporal evolution of SAM,SAM's transition from positive to negative phases is demonstrated to be driven by the leading mass transportation of Ferrel cell.When the SAM changes or the meridional geopotential height gradient in middle latitudes changes,it then destroys the geostrophic equilibrium between the zonal wind field and the geopotential height anomaly in middle latitudes,causing the gepstrophic deviation; then the geostrophic deviation drives the meridional wind filed,changing the anomalous Ferrel cell,and forming a self-adjustment internal process cycle.关键词
南半球环状模/地转调整/地转平衡Key words
Southern Hemisphere annular mode, geostrophic adjustment, geostrophic equilibrium分类
天文与地球科学引用本文复制引用
李晓峰,李建平..南半球环状模事件的准地转调整过程分析[J].大气科学,2012,36(4):755-768,14.基金项目
国家自然科学基金重点项目41030961,国家重点基础研究发展规划项目2010CB950404,国家自然科学基金资助项目40905040,中国科学院院知识创新工程重要方向项目KZCX2-YW-Q11-01,大气科学和地球流体力学数值模拟国家重点实验室自由探索 （）
