石家庄地区重力波引发局地暴雨的预报方法初探  

Study of Local Heavy Rain Initiated by Gravity Waves in Shijiazhuang of Hebei Province

作　　者：孟凯 张迎新 姚洁 田志广 

机构地区：[1]河北省气象台,河北石家庄050021 [2]山西省气象服务中心,山西太原030002

出　　处：《干旱气象》2015年第1期144-148,173,共6页Journal of Arid Meteorology

基　　金：公益性行业(气象)科研专项(GYHY200906011);中国气象局预报员专项(CMAYBY2012-005);国家科技支撑项目(2008BAC37B01)共同资助

摘　　要：通过动力学推导探讨了重力波引发的局地暴雨天气过程的发生发展机制,提出预报重力波传播的可行方法,并通过个例分析验证此方法的可行性。结果表明:(1)重力波的传播路径应与位温脊线一致,利用地面观测数据分析等位温线,可有效预报重力波的发生和演变;(2)波动既可以从高位温一侧向低位温一侧传播,也可以反方向传播;(3)重力波的传播与地面辐合线虽有对应关系,但并不一定由辐合线产生;(4)阵风锋是激发重力波的一种触发机制,受阵风锋作用2011年8月9日石家庄市区西侧造成短时强降水。This paper dynamically discussed the development mechanisms of local rainstorm triggered by gravity waves,and proposed a feasible method,which was verified by a case study,to forecast the propagations of gravity waves. The results showed that：（1 ）the propagation of gravity waves strictly consistent with the potential temperature ridge,and by analyzing the isentrope,the forecasting of the generation and evolution of gravity waves would be more effective;（2）the waves could travel from higher potential temperature to lower side,or propagate in reverse orientation;（3）there were corresponding relations between the propagation path of gravity waves and the surface convergence line. Though the waves propagated along with the convergence line,it did not generate the gravity waves;（4）in a case of rainstorm on 9th August 2011 in Shijiazhuang,the gust front generated the gravity waves as a triggering mechanism, and brought about strong rainfall in the west urban.

关 键 词：重力波 阵风锋 地面辐合线 局地暴雨 中尺度 

分 类 号：P458[天文地球—大气科学及气象学]