一次强飑线天气过程分析和龙卷强度级别判定  

THE ANALYSIS OF A STRONG SQUALL LINE PROCESS AND CLASSIFICATION OF TORNADO INTENSITY

作　　者：邵玲玲[1] 黄宁立[1] 邬锐[1] 陈亚敏[1] 

机构地区：[1]上海中心气象台,上海200030

出　　处：《气象科学》2006年第6期627-632,共6页Journal of the Meteorological Sciences

基　　金：上海市科委重点项目(编号:042512014)资助

摘　　要：利用WSR-88D多普勒天气雷达的连续探测资料,对2004年7月12日影响上海地区的强飑线天气过程进行了研究。通过飑线回波带的组成、移动、变化等分析了这次飑线系统的发展演变过程及其雷达回波特征,重点讨论了飑线与前方线状回波的交汇在飑线发展加强和弓状回波形成中的作用,并指出弱线状回波的存在是由温度和风的不连续而引起的。文中还提出利用多普勒雷达产品—中气旋的最大流入流出速度计算中气旋旋转速度,可对龙卷强度等级做出判定,并与实况灾情信息判定结果进行了比较。With continuous observation of WSR-88D Doppler weather radar, a strong squall line process in Shanghai on 12 July 2004 is researched and analyzed. It is discussed how the squall line and its radar echo evolves by observing the echo strip formation, moving, changing, and that the mergence of squall line and weak line echoes in its front have an influence on enhancing squall and initiation of bow echo. It is Concluded that the weak line echoes is caused by discontinuous area of temperature and wind. Finally, the intensity of tornado is classified based on eddy velocity of mesocyclone, which can be calculated using maximum inward and outward velocity, and is compared with results from actual disaster information.

关 键 词：飑线 分析 龙卷强度 

分 类 号：P463.1[天文地球—大气科学及气象学]