【摘要】 利用灾后调查资料、常规观测资料及三门峡市多普勒雷达资料,分析2007年7月发生在洛阳市孟津县的严重风灾,结果表明:这是孟津县首次在非观测区确认的龙卷灾害;该龙卷为非超级单体龙卷,在反射率因子图上几乎没有任何明显特征,而在风暴径向速度图上呈现为较明显的小尺度涡旋特征;具有显著的低层辐合高层辐散的特征;低的抬升凝结高度和低层明显的垂直风切变及合适的对流有效位能、对流抑制能量是产生龙卷适宜的环境条件;在高低空深厚的槽前西南急流引导下,来自洛阳市西部的弱回波快速东北偏北移到孟津境内强烈快速发展,形成的强回波遇到近地面层的辐合线在弱冷空气的触发下诱发龙卷暴发。更多还原

【Abstract】 By utilizing the research data,regular meteorological data and Doppler radar data after tornado in Sanmenxia,the serious wind disaster occurred in July 2007 in Mengjin is analyzed.The result shows: It was the first time to confirm tornado event in Mengjin in non-observation area;this tornado is a nonsupercell tornado,which presents little signature on reflectivity maps but clear microvortex characteristic on radial velocity maps;system allocation has obvious feature of convergence in low level and divergence in high level;low lifting condensation level,obvious low-level vertical wind shear,proper convective available potential energy and convective inhibitory energy are appropriate environmental conditions to produce tornado;under the guidance of deep southwest jet in front of trough,the weak echo from western Luoyang City moves fast to north-northeast and develops intensively in Mengjin County,where the strong echo encountered convergence line in near-surface layer and triggered tornado by weak cold air.更多还原