长江流域资源与环境 >> 2012, Vol. 21 >> Issue (08): 1025-.

• 自然灾害 • 上一篇    下一篇

长江中下游深秋季节一次MCC过程的成因

黄治勇 |谌伟,张文|林春泽   

  1. (1.中国气象局武汉暴雨研究所暴雨监测预警湖北省重点实验室|湖北 武汉430074;2.武汉中心气象台|湖北 武汉430074
  • 出版日期:2012-08-20

MECHANISM ANALYSIS OF A MCC EVENT IN LATE AUTUMN OVER THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER

HUANG Zhiyong1 |SHEN Wei2 |ZHANG Wen2| LIN Chunze1   

  1. (1. Hubei key Laboratory for Heavy Rain Monitoring and Warning |Research,Institute of Heavy Rain, China Meteorological Administration, Wuhan 430074,China;2. Wuhan Central Meteorological Observatory, Wuhan 430074,China
  • Online:2012-08-20

摘要:

利用常规观测资料、NCEP再分析资料以及FY2C云图资料等,对2009年11月9日长江中下游地区深秋季节1次MCC过程发生发展进行了成因分析。结果表明:此次MCC发生在大尺度地面暖倒槽之中,500hPa低槽东移、850hPa低涡发展东移、边界层冷空气南下形成的弱冷锋等天气系统的配合为其发生提供了有利环境条件;MCC发生在对流层中层低能舌与低层高能舌重叠的对流不稳定区;高层辐散、低层辐合以及强涡度柱和散度柱的耦合成为MCC发展维持的主要动力机制;MMC的发展成熟阶段,对流层中低层始终维持不稳定层结状态,且随着降水增强,出现湿中性垂直运动特征;MCC成熟期其中心区风向随高度一致顺转,风速切变较强,具有超级单体风暴结构特征

Abstract:

Based on meteorological observational data,NCEP reanalysis data and cloud pictures of FY2C,the occurring and developing mechanism of a MCC event on Nov. 9,2010 was analyzed. The results show that the MCC occurred in a ground warm inverted trough.The moving eastward of a low trough at 500 hpa,the development and moving eastward of a low vortex at 850 hpa and the weak cold front caused by the moving southward of the cold air on the boundary layer provided favorable environmental conditions for the formation of MCC.The MCC occurred in the convective unstable area where the low energy tongue in the middle troposphere overlapped with the high energy tongue in the lower troposphere.Upperlevel divergence, low level convergence and the coupling of the strong vorticity column and divergence column was the main dynamical mechanism of the MCC development and maintenance.During the developing and mature stage of the MCC,the atmosphere was unstable layer which strengthened with the rainfall and appeared the feature of wet neutral vertical motion in the middle and lower troposphere levels.In the mature stage, the wind direction in the MCC center with strong wind shear shifted clockwise with the height and the MCC had the structural characteristics of supercell storm

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