摘要
利用Micaps常规资料、自动站资料探讨了2008年4月7日14时左右在泰顺地区发生的雹灾过程的天气学原因。认为:高层冷空气的侵入,中低层的增温回暖导致了大气层结不稳定,700 hPa的西南急流以及风速在浙南闽北的辐合为雹灾的发生提供了充足的水汽条件;地面上泰顺附近的辐合线以及700 hPa上干线的存在,为雹灾的发生提供了一定的动力条件;自动站资料对于强对流天气的预测预警有很好的帮助作用。同时还对此期间的多普勒雷达产品进行了分析,发现三体散射特征(TBSS)对于冰雹的出现有很好的指示作用,中气旋的生消与产生冰雹的对流风暴的生消基本一致,垂直积分液态含水量(VIL)值的突增对于冰雹天气有一定的识别能力,而以上多普勒雷达产品的综合比较分析可以有效的对冰雹过程做出预测预警。
The Synoptic Cause of Formation of a local hailstorm which happened in Taishun County, Wenzhou City,Zhejiang Province at 14：00 on April 7,2008 is discussed with the routine data and automatic station data. It is showed that the cold air invasion from upper level and the air warming in lower level lead to the instability of stratified atmosphere. The enough moisture is provided by the strong southwest jet of 700 hPa and the wind speed convergence over the boundary of Fujian and Zhejiang Provinces. Meanwhile the convergence line nearby Taishun County and the dry line of 700 hPa supply the certain dynamic condition which brings about the local hail disaster. It is also found that the automatic station data could play an important role for the foreshadow and early warning of the strong convective weather. Further more,the Doppler radar echo products are analyzed. It is revealed that three body scatter signature （TBSS） could offer a reliable signal of hail appearance ,the formation and disappear of mesocyclone was consonant with the convection-storm which bring on the hailstorm and the rush of vertical integrated liquid water （VIL） could be used to judge the advent of the hailsotorm. The compositive analysis on Doppler radar products is effective to forecast hailstorm.
出处
《科技通报》
北大核心
2010年第1期51-57,62,共8页
Bulletin of Science and Technology
关键词
局部雹灾
多普勒雷达
回波特征
local hail disaster
Doppler radar
echo Features
