首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Barotropic Process Contributing to the Formation and Growth of Tropical Cyclone Nargis
Authors:MAO Jiangyu and WU Guoxiong
Institution:State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences andGeophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
Abstract:This study reveals the barotropic dynamics associated with the formation and growth of tropical cyclone Nargis in 2008, during its formation stage. Strong equatorial westerlies occurred over the southern Bay of Bengal in association with the arrival of an intraseasonal westerly event during the period 22--24 April 2008. The westerlies, together with strong tropical--subtropical easterlies, constituted a large-scale horizontal shear flow, creating cyclonic vorticity and thereby promoting the incipient disturbance that eventually evolved into Nargis. This basic zonal flow in the lower troposphere was barotropically unstable, with the amplified disturbance gaining more kinetic energy from the easterly jet than from the westerly jet during 25--26 April. This finding suggests that more attention should be paid to the unstable easterly jet when monitoring and predicting the development of tropical cyclones. Energetics analyses reveal that barotropic energy conversion by the meridional gradient of the basic zonal flow was indeed an important energy source for the growth of Nargis.
Keywords:tropical cyclone  tropical--subtropical easterlies  barotropic instability
本文献已被 CNKI SpringerLink 等数据库收录!
点击此处可从《大气科学进展》浏览原始摘要信息
点击此处可从《大气科学进展》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号