利用多普勒雷达产品识别重庆冰雹云指标分析  

Analysis of Characteristic Indexes for Hail Cloud Identification in Chongqing by Means of Doppler Radar Products

作　　者：廖向花[1] 林娜[1] 李轲[1] 王中[1] 

机构地区：[1]重庆市人工影响天气办公室,重庆401147

出　　处：《西南大学学报（自然科学版）》2011年第11期131-135,共5页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市科技攻关计划项目-重庆市人工影响天气业务系统建设(CSTC.2008AB0015)

摘　　要：利用重庆、万州、恩施三部多普勒天气雷达产品,分析了重庆2008-2010年的9次冰雹过程,总结了一些冰雹天气的多普勒雷达回波特征指标.发现当回波强度大于等于50dBZ,回波顶高大于等于11km,垂直累积液态含水量大于等于44kg/m2,冰雹指数出现连续几个实心三角标志,中层具有强的风速辐合或者中气旋时容易降雹;出现三体散射回波等冰雹典型特征时肯定降雹.垂直累积液态含水量越大,大于60kg/m2的强VIL持续时间越长,冰雹直径越大.在冰雹云发展阶段VIL存在≥15kg/m2的明显跃增且跃增后VIL≥50kg/m2,这是冰雹独特的特征,对判别冰雹云有较高应用价值.The products of three Doppler radars located at Chongqing,Wanzhou and Enshi are used to analyze 8 hail processes between 2008 and 2010 in Chongqing.Some characteristic indexes of Doppler radar echoes for hail weather are summed up.The results show that hailfall is likely to occur when the echo intensity is above 50 dBZ,the echo top is greater than 11 km,the vertically integral liquid water（VIL） is above 44 kg/m2,some hail index solid triangles appear in a row,and the middle layer has a strong wind convergence or meso-cyclone.Some certain typical characteristics such as three-body scattering echo mean that hailfall is inevitable.The diameter of a hail increases with the vertically integrated liquid water content and the duration of the strong VIL（greater than 60 kg/m2）.In the development of a hail,an abrupt jump of ≧15kg/m2 in VIL occurs,and the VIL after the jump is 50 kg/m2,which is a unique feature for hailfall,valuable for hail cloud identification.

关 键 词：冰雹 多普勒雷达 回波指标 

分 类 号：P482[天文地球—大气科学及气象学]