一次飑线过程的多普勒雷达资料分析

Doppler Radar Data Analysis of a Squall Line Process

利用承德多普勒雷达的反射率因子、径向速度、垂直积分液态含水量(VIL)等产品,结合环流形势和自动站资料,对2008年6月25日发生在承德境内的一次飑线天气过程进行了分析,初步探讨了承德地区飑线天气过程的多普勒雷达回波演变特征,分析结果表明:大风位于弓形飑线回波的凸起部位。负速度中心值逐渐增大到>27m/s且逐渐靠近雷达,预示大风天气的出现。VIL值的剧减、跃增和持续高的ET与大风、冰雹等强对流天气有一定的对应关系。对利用多普勒天气雷达识别和预报强对流灾害性天气提供参考。

By using of the reflectivity, radial velocity, Vertically Integrating Liquid （VIL） Water and other products of Doppler radar in Chengde, and combined with circulation situation and automatic weather station data, this paper analyzed a 25 June 2008 and discussed its evolvement character squall line process happened in Chengde on of Doppler radar echo. The results show that the strong wind locates the bulge spot of bow squall line echo. When the negative center value of radial velocity increases gradually to greater than 27 m/s and approaches the radar, the strong wind will appear. VIL value increasing rapidly and reducing sharply, Echo Tops （ET） value continuing highly have corresponding relationships with heavy convection event such as strong wind, hail and so on. This study provides reference for recognition and forecast of strong convective disastrous weather with Doppler weather radar.