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《Journal of Nanjing Institute of Meteorology》 2005-01
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Barotropic/Baroclinic Joint Instability in the Storm Rainfall Far from a Typhoon

ZHANG Xing-qiang~(1,2), SUN Xing-chi~3, DING Zhi-ying~1 (1.Department of Atmospheric Sciences,NUIST,Nanjing 210044,China; 2.Taian Meteorological Bureau,Taian 271000,China; 3.Shandong Meteorological Observatory,Jinan 250031,China)  
Application of the analysis and calculation of the barotropic/baroclinic joint instability in the storm rainfall far from a typhoon are introduced.Based on simulations and observations,analyses and calculations of barotropic and baroclinic items were carried out at different time levels and positions in the storm rainfall induced by 9711 typhoon.Results show that precipitation at the initial stage was basically caused by barotropic disturbances,and two rainfall areas,caused by the barotropic/baroclinic joint instability,occurred to the south and north of the typhoon circulation along with the coupling of the typhoon and the westerly trough.Especially,the baroclinic instability was more obvious in the north rain area,and had a strengthening trend with the non-zonal enhancement of the high-level jet.So we can conclude that the storm rainfall far from the typhoon is the offspring of the barotropic/baroclinic joint instability, and the strengthening of the baroclinic instability is closely associated with the non-zonal high-level jet.
【Fund】: 山东省气象局课题“泰安市中小尺度暴雨预报模式研究”
【CateGory Index】: P458.121.1
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