一次典型超级单体降雹的Doppler雷达资料分析(英文)

Analysis on the Doppler Radar Materials of A Typical Supercell Hailstorm

利用多普勒雷达基本反射率、径向速度以及径向速度计算的风切变结果,对一次典型超级单体降雹天气过程进行分析,结果发现:风暴形成初期强回波出现在体扫中层,且有径向风辐合,预示回波增强;随着风暴发展,径向辐合逐渐增强,并有垂直伸展,说明暖湿入流持续增强,为风暴发展提供足够水气和热力条件;风暴强盛期,可以观测到有界弱回波、"V"形缺口,并在径向速度场上有中气旋存在;垂直切变反应出,初期风随高度顺转的环境场,以及强盛期低层暖湿入流、高层干冷辐散、中层强烈上升气流的空间分布;风暴消散阶段,径向风辐散逐渐下传,径向风辐合减弱,强回波消失。

Based on basic reflectivity of Doppler radar,radial velocity and wind shear result calculated via radial velocity,a typical supercell hailstorm was analyzed.It was found that strong echo appeared in the middle level of volume scan during the beginning of storm and the converging radial wind indicated the increasing echo;with the development of storm,the converging radial wind increased gradually and tended to extend vertically,which reveals that the influx of warm and damp air provides enough vapor and heat.In the fastigium of storm,bounded weak echo region and V-shape gap can be observed;moreover,there was a mesocyclone in the radial velocity field.Vertical shear reflected environment field that wind rotated in clockwise with the increase of height,warm and damp influx at low altitude,the dry and cold air diverging at high altitude and the spatial distribution of ascending air flow at the middle level;during the dispersing of storm,the divergence of radial wind transformed to lower level gradually and its convergence reduced with strong echo disappeared.