Numerical Study of One Plateau Vortex Moving Eastward Affecting Heavy Rainfall in Sichuan
Numerical Study of One Plateau Vortex Moving Eastward Affecting Heavy Rainfall in Sichuan
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发表时间：
2010
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通讯作者：
Chen Jing
中科院分区：
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作者：
Chen Jing
基于自动气象站台网资料、常规观测资料和T213分析资料，利用MM5中尺度数值模式和T213再分析资料，对2008年7月20日发生在四川盆地的高原涡旋暴雨进行了模拟。模拟结果表明：高原涡旋东移促进了四川盆地上空正涡度的发展，对流层高层强辐散和低层辐合增强，可能出现对流降水。降水释放的潜热可能促进对流层高层负涡度和低层正涡度的发展。因此，正反馈机制正在形成，这一反馈机制可能支持和维持了此次低涡和四川盆地强降雨。
Based on auto-weather station network data,conventional observation data and T213 analysis data,using the MM5 mesoscale numerical model and T213 reanalysis data,simulation was conducted the Plateau vortex rainstorm occurring in Sichuan basin on 20 July,2008.The simulated results show that: the Plateau vortex moving eastward promot the development of the positive vorticity over the Sichuan Basin,hence,the strong divergence at the tropospheric higher level and the convergence at the lower level are enhanced,and the convective precipitation may occur.The released latent heat of the precipitation may promote the development of the negative voritcity at the tropospheric higher level and the positive vorticity at the lower level.As a result,a positive feedback mechanism is forming,this feedback mechanism may support and maintain the vortex and the heavy rainfall over the Sichuan Basin.