摘要
利用合肥新一代天气雷达资料对 2 0 0 3年 7月 8日夜间发生在安徽庐江和无为县的龙卷过程进行了简要的分析。 7月 8日夜间至 9日凌晨 ,与一条自西向东移动的、被包裹在大片层状雨区中的带状对流 (飑线 )相联系 ,先后有 4个径向速度场上明显的小尺度涡旋特征出现在飑线的前沿。其中一个小尺度涡旋特征持续了大约 2小时 30分 ,先后在庐江和无为县产生了龙卷。特别是在无为产生的龙卷 ,造成了严重的生命和财产损失 ,其级别为F2～F3,属于较强龙卷。分析表明 ,此次龙卷为非超级单体龙卷 ,在反射率因子图上几乎没有任何特征 ,而在径向速度图上呈现为明显的小尺度涡旋特征 。
A series of tornado events occurred during 8 July 2003 in Anhui province is analyzed briefly with the new generation weather radar data. From the night of 8 to the early morning of 9 July 2003, associated with a mesoscale squall line which embodied within a large precipitation area, a series of four smallscale vortex signatures appear at the leading edge of the squall line. One of the microscale vortex lasted two and a half hour, produced tornadoes in Lujiang county and Wuwei county, consecutively. The tornado in Wuwei county attained F2-F3 and caused severe life loss and poverty damage. Analysis shows that this tornado is a non supercell tornado, which presents little signature on reflectivity maps but clear micro vortex signature on radial velocity maps could be seen, indicating that the new generation weather radar, with its ability to measure the radial velocity, greatly enhanced weather radar's capability to detect the tornadoes.
出处
《气象》
CSCD
北大核心
2004年第1期38-40,45,共4页
Meteorological Monthly
基金
国家气象局课题<安徽省淮河流域梅雨期 (雨季 )中尺度系统发生
发展及预报方法研究>
安徽省气象局课题<省级短时灾害性天气预警系统>
教育部优秀年轻教师研究基金资助
关键词
龙卷分析
天气雷达
径向速度图
小尺度涡旋特征
tornado new generation weather radar radial velocity map microscale vortex signature
