滇南飑线的发生环境及其多普勒雷达回波特征

通过对NCEP资料、常规气象资料和CIND3830-CC多普勒雷达观测资料的统计分析,归纳出滇南普洱市2004—2009年18次飑线发生前的天气形势及物理量场特征、飑线的时间分布特征、飑线的移动路径等。总结了飑线在多普勒雷达图上的基本结构、飑线中强对流单体的基本反射率特征、径向速度特征及天气对应关系,并分析飑线中回波单体的结构与灾害天气类型的对应关系、垂直液态水含量(VIL)的变化与飑线中冰雹的相关关系等。根据灾害类型和飑线中单体的结构将飑线分为5种类型,对飑线的短时临近预报有指导作用。

ANALYSIS OF THE CONDITION OF SQUALL LINES AND THE CHARACTERISTICS OF THEIR DOPPLER RADAR ECHOS IN SOUTHERN YUNNAN

With an analysis of the data of National Centers for Environmental Prediction(USA) reanalysis,a Doppler CIND3830-CC and conventional observations of meteorological stations,the space-time distribution characteristics and the moving path were studied of 18 squall lines during 2004—2009 in the city of Pu’er in southern Yunnan.Lager-scale weather situation and physical elements characteristics prior to the squall lines were studied.For the squall lines,their relationship to precipitation,their basic structure as shown in the Doppler radar,their basic reflectivity of strong convective thunderstorm cells,and their radial velocity were examined.Then the relationship was also analyzed between the echo structure of thunderstorm cells in the squall lines and disastrous weather patterns,between VIL changes and the hail in the squall lines,etc.According to the types of disastrous weather and the structures of squall lines in thunderstorm cells,the squall line can be divided into five types.The research results are instructive on the nowcasting of squall lines.