摘要
2016年6月7日下午鄂西发生一次伴有超级单体的强对流过程。利用常规地面和高空观测资料以及区域自动站、多普勒天气雷达等资料,对该过程超级单体形成的环境条件及雷达回波特征进行了详细分析。结果表明:(1)上干下湿不稳定层结、较高的对流有效位能与强烈的低空垂直风切变是有利于超级单体产生的环境条件,地面辐合线和鄂西北山区地形对超级单体的触发和增强起到关键作用;(2)宽大有界弱回波区以及位于其上的强悬垂回波,弱回波区前侧强入流与中层径向辐合(MARC)的存在,都表明超级单体具有降雹潜势;(3)大风核(27 m·s-1)持续时间超过2 h、中气旋深厚持久、阵风锋、高空强冷平流下传以及风暴内部下沉气流的共同作用,导致了地面大风;(4)前侧入流槽口斜升气流强而持久且风暴顶辐散长时间维持,造成强降水。
Based on data from routine upper-air and surface observations, regional automatic weather stations and Doppler weather radar, we have analyzed the environmental conditions and radar echo characteristics of the supercell in a severe convective weather event occurred in the northwest of Hubei Province on 7 June 2016. The result shows that（1） unstable stratification with dry air in the high and humid air in the low levels, moderate convective available potential energy and medium-weak vertical wind shear are advantageous to the formation of a supercell. Surface mesoscale convergence line and the terrain over northwest Hubei play a key role in triggering the supercell.（2） Factors, such as wide bounded weak echo region and strong overhanging echoes on it, strong inflow in the weak echo region and middle radial convergence（MARC）, all indicate that the supercell has a hailfall potential.（3） The interaction of gale nucleus（27 m·s^-1） lasted for more than 2 h, deep mesocyclone with a long life cycle, gust front, downward transport of strong cold advection at upper air and downdrafts in the interior of storm leads to the surface gale.（4） Strong and long slanting updrafts in V-front inflow notch area and the continuance of divergence about storm top result in strong precipitation.
作者
黄俊杰
苟阿宁
HUANG Junjie;GOU A＇ning(State Grid Hubei Electric Power Research Institute,Wuhan 40077;State Grid Key Laboratory of On-site Test Technology on High Voltage Power Apparatus,Wuhan 40077;Wuhan Central Meteorological Observatory,Wuhan 430074)
出处
《暴雨灾害》
2018年第5期462-469,共8页
Torrential Rain and Disasters
基金
气象关键技术集成与应用项目"基于云计算的电力气象灾害评估移动客户端完善与应用"(CMAGJ2014M35)
湖北电力公司科技项目"湖北电网洪涝灾害特殊区域分布图绘制"(SGTYHT/16-YJ-179)
关键词
超级单体
中层径向辐合
中气旋
地面大风
强降水
supercell
middle radial convergence （MARC）
mesocyclone
surface gale
strong precipitation
