摘要
利用河北省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日发生在承德市境内的一次飑线天气过程进行了分析,初步探讨了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>27 m/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。
By using the reflectivity, radial velocity, Vertically Integrating Liquid （VIL） Water Content and other products of Chengde Doppler radar, a squall line process happened in Chengde on 25 June 2008 was analyzed combining circulation situation and automatic weather station data. It was discussed how Doppler radar echoes of the squall line in Chengde evolved. The results show the strong wind locates in bulge spot of the bow squall line echo. The negative center value of radial velocity increased gradually then more than 27 m/ s and approached the radar,which indicated that the strong wind would occur. VIL value increasing rapidly, reducing sharply and the continued high Echo Tops （ET） value have corresponding relationships with the strong wind, hail and so on.
出处
《干旱气象》
2009年第1期29-33,共5页
Journal of Arid Meteorology
关键词
多普勒雷达
飑线
回波
Doppler radar
squall line
echo
