甘肃省永登地区一次强单体冰雹过程分析  

Analysis on a Strong Single Hail Occurred in Yongdeng County of Gansu Province

作　　者：渠永兴[1] 孙旭映[1] 冀兰芝[2] 韩玲 

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]兰州中心气象台,甘肃兰州730020 [3]榆中县气象局,甘肃兰州730100

出　　处：《干旱气象》2005年第3期34-38,共5页Journal of Arid Meteorology

基　　金：甘肃省人工增雨防雹作业体系工程建设科技开发第三批项目"测雨雷达现场指挥作业研究";科技部2002年社会公益研究项目"西北地区人工防雹消雹技术"(2002DIB10046)等资助

摘　　要：根据2003年7月8日发生在甘肃省永登县境内的一次强单体冰雹过程,从天气学背景、雷达回波的演变特征出发,分析了该过程回波高度和含水量、高度和强度的跃增变化以及强单体特殊的结构特征。分析结果表明,垂直剖面上强反射率区的范围及伸展高度对雹云的发展有重要作用。强反射率区对应着云中含水量集中区域,只有含水量累积区位于云中过冷区中时才利于冰雹的生长;一旦回波出现55 dB z并高度达到4 km以上,降雹随即产生;强单体雹暴是一种发展非常强烈,有着特殊结构的强雷暴。上述结果对冰雹预警有重要意义。According to the synoptic background and the evolution characteristics of radar echoes of a strong single hail event occurred in Yongdeng county of Gansu Province on July 8, 2003, the jumping change of echo height, intensity and liquid water content, and the special structure features of the strong single hail were analyzed in this paper. The results show that the range and extension height of strong reflectivity area on vertical section are important to hailstorm development. While the strong reflectivity area is corresponding to abundant water area in cloud, and only water content accumulating area being in the supercooled region in the cloud can be benefit to hail development. Once the echo intensity reached 55 dBz and its height was above 4 km, hail falls immediately. The strong single hail with special structure developed very strongly. Above conclusions are significant to hail monitoring and prewarning.

关 键 词：冰雹 强单体 过程分析 甘肃永登 

分 类 号：P458.1[天文地球—大气科学及气象学]