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《Chinese Journal of Geophysics》 2008-01
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Seasonal and regional features of the Asian-Australian monsoon as revealed by meridional flow

CHEN Ji-Long, HUANG Rong-HuiCenter for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080, China  
Using the NCEP/NCAR reanalysis data for the period of 1979~2003, climatological characteristics of seasonal cycle and regional structure of the meridional flow associated with the Asian-Australian monsoon system are investigated. The results show that meridional flows in the Asian-Australian monsoon region display a seasonal reverse of the baroclinic structure in vertical direction, characterized by transition from low-level northerlies and high-level southerlies in boreal winter to low-level southerlies and high-level northerlies in boreal summer. The meridional flows with seasonal reverse mainly distribute over the Asian monsoon region and equatorial neighborhood, which exhibit significant regionality in the middle and lower troposphere. Consistent with three channels of meridional flows in the middle and lower troposphere over the Asian tropical monsoon region, three branches of meridional circulation are relatively independed, which are approximately divided by 75°E and 100°E and arranged from west to east in the Asian-Australian monsoon region. There are obvious differences among them in both winter and summer, such as eastward lowering of the meridional circulation center in boreal winter and eastward rising of the meridional circulation range in boreal summer.
【Fund】: 国家自然科学基金项目(40705034 40575026和40725016);; 中国科学院知识创新工程领域前沿项目(IAP07118)资助
【CateGory Index】: P434
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