摘要
利用Doppler雷达产品,结合常规观测资料对2008年7月25日中国准噶尔盆地南缘冰雹、强降水的雷达回波结构演变特征进行分析。结果表明:此次冰雹、强降水天气过程发生在西伯利亚至巴尔喀什湖冷槽东南象限的对流不稳定层结中,近低层至地面有中尺度辐合切变线。强风暴的演变可归为"逗点—‘人’字形—螺旋形"3个回波阶段,相应径向速度图上出现"逆风区"、中气旋和辐合区。冰雹的雷达回波强度中心值超过65 dBz6,0 dBz回波顶高为5.5 km,65 dBz回波顶高为3.0 km。垂直累积液态含水量由10 kg.m-2增至70 kg.m-2。强降水的雷达回波强度中心值达60 dBz,55 dBz回波顶高为3.7 km6,0 dBz回波顶高为2.2 km。垂直累积液态含水量由15 kg.m-2增加至55 kg.m-2。Doppler雷达产品对冰雹、强降水天气监测预警具有指示意义。
Radar echo evolvement characteristics of a hailstone and severe rainstorm process on July 25,2008 were analyzed in the south edge of Junggar Basin based on Doppler radar weather data and conventional observational data.The results indicate that this process occurs in convective instability stratification from Siberian to cold trough of the southeastern Balkhash Lake.There is mesoscale convergence shear line from low layer to ground.The evolvement of this severe rainstorm could be divided into three phases,i.e.comma echo,＂人＂shape echo and spiral echo,and they are corresponding with adverse wind area,mesoscale cyclone and convergence region in terms of radial velocity distribution.Radar echo intensity central value of hailstone exceeds 65 dBz.Echo tops（ETOP） of 60 dBz and 65 dBz are 5.5 km and 3.0 km,respectively.Vertically integrated liquid water content increases from 10 kg·m^-2 to 70 kg·m^-2.Radar echo intensity central value of severe rainstorm exceeds 60 dBz.ETOP of 55 dBz and 60 dBz are 3.7 km and 2.2 km,respectively.Vertically integrated liquid water content increases from 15 kg·m^-2to 55 kg·m^-2.Doppler radar products are indicative of monitoring,forecasting and warning of hailstone and severe rainstorm.
出处
《气象与环境学报》
2011年第1期21-26,共6页
Journal of Meteorology and Environment
基金
公益性行业(气象)科研专项(GYHY201006012)
中国沙漠气象科学基金(sqj2010013)
新疆气象局气象科技研究课题(201015)共同资助
