准葛尔盆地南缘一次强对流天气的多普勒雷达特征分析

Doppler Radar Characteristic Analysis of a Heavy Convection Weather Process in Zhunger Basin South Edge

利用常规气象探测资料、自动站资料和石河子CINRAD/CC多普勒天气雷达观测资料,对2010年6月28日发生在准葛尔盆地南缘的一次强对流天气进行了分析。结果表明:这次强对流天气发生在高空低槽和地面冷锋的相互配合,且大气层结不稳定条件下,中高层干冷低层暖湿,水汽条件充沛,0℃层和-20℃层的高度适宜,同时具有强的垂直风切变。在多普勒雷达反射率因子PPI图上出现了>50dBZ的强回波区及>60dBZ强回波中心;在RHI图上出现了穹窿结构,且>50dBZ强回波区高度远高于当天0℃层的高度;在平均径向速度图上出现了中气旋、逆风区;在冰雹形成区有低层辐合、高层辐散等特征;在不同仰角的PPI上气流表现出强烈的旋转和上升;强回波区与逆风区、中气旋、VIL在位置上有很好的对应关系,同时VIL产品对冰雹落区预报有很好的指示作用;中气旋产品(M)和风暴跟踪信息(STI)都对冰雹天气的出现具有很好预警意义,对今后的防雹减灾工作有较好的应用价值。

The paper analyzed a hailstone weather occurred in the Zhunger south edge’s region on June 28,2010 based on the routine data,automatic meteorological station data and CINRAD/CC Doppler radar data. The results showed that the heavy convection weather occurred under the condition of high altitude trough cooperated with ground cold front and instable atmospheric stratification,dry and cold in middle high layer and warm and wet in low layer,abundant water vapor,fitting height of 0 ℃ layer and 2. 0 ℃ layer, meanwhile there was heavy vertical wind shear. Doppler radar reflectivity factor PPI appeared 50 dBZ heavy echo section and 60 dBZ heavy echo center. The RHI appeared cove configuration,and the height of 50 dBZ echo section was more higher than that of 0 ℃ layer. The radial velocity map showed mesocyclone,against the wind section. It presented low layer convergence and high layer divergence in hailstone area. Updraft in PPI of different elevations showed circumrotating and rising. Strong echo section corresponded well to against the wind section and mesocyclone,meanwhile VIL,mesocyclone and storm track information products had good indication for hailstone drop.