黄土高原一次连续性强对流天气分析  

Analysis of a Continuous Severe Convective Weather in the Loess Plateau

作　　者：姚静[1] 井宇[1] 赵强[1] 李萍云[1] 

机构地区：[1]陕西省气象台,陕西西安710014

出　　处：《沙漠与绿洲气象》2017年第3期55-64,共10页Desert and Oasis Meteorology

基　　金：陕西省气象局预报员专项(2014Y-1)

摘　　要：利用常规观测资料、自动站资料、榆林市CINRAD/CB多普勒天气雷达观测资料和NCEP1°×1°逐6 h再分析资料,对2014年6月29日、30傍晚发生在陕西榆林市黄土高原地带的一次强对流天气进行了综合分析。结果表明:甘肃东部到陕西的低槽是此次强对流天气直接影响系统,地面干线和辐合线触发此次对流天气;降雹区上空的垂直运动较强,对流有效位能较大,低层充沛的水汽通量输送明显,水汽通量散度汇合在陕西北部、适宜的0℃、-20℃层高度,为强对流天气的出现提供有利条件。三体散射长钉、超过8 km的50 d Bz强回波区、中等强度涡旋、逆风区都对冰雹天气预警有较好的指示意义。A strong convective weather in the Loess Plateau area of Yulin city in Shaanxi wasconducteda comprehensive analysis by using conventional observation data,automatic station data,Yulin CINRAD/CB Doppler radar data and NCEP1℃ 1℃ six -hour reanalysis data. The weatheroccurred in the late afternoon on June 29th and 30th,2014. The results show that the low trough ineastern Gansu to Shaanxi is the direct affect system of the strong convective weather. The processwas triggered by the surface dew-point and convergence line. The strong vertical movement over thehail area, high convective available potential energy, the lower abundant vapor fluxtransportations,the convergence of moisture flux divergence in northern Shaanxi and the suitable0℃ ,-20℃ level height provide favorable conditions for the occurrence of strong convectiveweather. The three-body scatter spike echo,more than 8 km of the strong echo region of 50 dBz,medium-intensity vortex,the upwind zone all have indicative significance in hail weather warning.

关 键 词：冰雹 诊断分析 雷达回波 三体散射 

分 类 号：P458.1[天文地球—大气科学及气象学]