| 摘要: |
| 2018年3月18日-19日，贵州省中部发生了一次由地面热低压引起的典型强对流天气过程，本文运用常规观测站资料、风廓线雷达资料和多普勒天气雷达资料对过程前后的雷达回波和风场特征做了诊断分析，得到如下结论：（1）在多普勒天气雷达的静锥区内，风廓线雷达的产品是很好的补充，两者点面结合可分析出锋面、急流和冷暖平流的变化情况；（2）在地面热地压和高空槽的引导下，对流单体不断生成并增强，测站上空观测到有近地面低空切变线稳定维持，低空急流出现的时间提前于降水开始的时间，低空急流范围扩大和位置下移时表明对流系统持续发展增强，配合多普勒天气雷达产品能更好的追踪大范围内单体的移动路径，降水结束后低空急流也逐渐减弱消失；（3）降水开始前，垂直层上垂直速度正负差别越大表明不同层热交换强烈，对流活动越强，当降水开始时垂直速度正值迅速加大，由于存在很大的脉动性，因此这个指数仅作为参考指标。 |
| 关键词: 风廓线雷达；多普勒天气雷达；强对流天气系统；低空急流 |
| DOI： |
| 投稿时间：2018-12-18修订日期：2019-03-13 |
| 基金项目:“贵州‘两高’沿线特色农业气候精细化区划与气象灾害防控”(黔科合重大专项字[2011]6003号)，贵州冰雹云形成初期雷达回波特征参数识别研究(黔科合J字[2012] 2228号) |
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| Application of wind profile radar and Doppler weather radar in a severe convective weather process |
| HUANG Jinquan,LI Lili,Wen Ji Fen,zou shu ping |
| (Guizhou Air Traffic Management Bureau;Guizhou Institute of Mountainous Environment and Climate;Guizhou Office of Weather Modification) |
| Abstract: |
| Using the data of conventional observation and radiosonde in combination with objective analysis of wind profile radar data and Doppler radar data, the severe convective systems on 18 Mar. 2018 in center of Guizhou Province are analyzed. The results show that (1)in the radar static cone region,the wind profile radar data is an important supplementary information to analysis the low-level jet,wind shear and advection;(2)Under the background of upper trough and heat low,the convective cell generate and enhance continually,there are low-wind shears keeping steadily over the wind profile radar,the appearance time of low-level jet is earlier than the onset of rainfall, the low-level jet decreases, and disappears eventually after the rainfall, the area changing of low-level jet and the height change has close relationship with evolution of severe system. (3)Before the rainfall,the the bigger differences of positive and negative vertical velocity mean the more intensely of heat exchanging between different levels, the vertical velocity enlarges as the rainfall starting,this index is characterized by pulsation and lack of representation, so it only has referential value. |
| Key words: Wind Profile Radar; Doppler Weather Radar; Severe Convective System; Low-level Jet |
