| 摘要: |
| 利用习水C波段双偏振雷达和常规气象观测资料对2021年5月9日发生在毕节的一次冰雹和雷暴大风强对流天气特征进行分析，结果表明：上干冷下暖湿层结使得毕节大气层结极不稳定，午后地面辐合线叠加露点锋抬升触发对流形成有组织性的多单体强风暴。反射率因子表现出典型强风暴型雷暴单体特征，有利于大冰雹的生成和发展。双偏振雷达参量ZDR和CC能有效识别降水粒子类型，其中已识别冰雹区中相关系数ρHV异常低值区能较好地反映出大冰雹或超大冰雹特征。阵风锋的出现以及风暴单体底层的冷池出流是百里杜鹃—黔西一线大风出现的主要原因，配合径向速度图上低层强气旋式辐合使得地面大风加强，造成黔西县出现极端破坏性大风天气。 |
| 关键词: 双偏振；强对流；冰雹；大风；毕节 |
| DOI： |
| 投稿时间：2021-05-31 |
| 基金项目:国家自然科学基金（41965010）:乌蒙山东侧雹源地初生雹云形成机制及催化机理研究；贵州省气象局科研业务项目（黔气科登[2021]11-10号）:毕节分级降雨特征及在城镇预报中的应用分析 |
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| Analysis of Dual P-polarization Radar of a Strong Storm in Bijie |
| YAO Lang,ZHOU Yongshui,LI Gang,LI Li,WU Shan |
| (Bijie Meteorological Bureau of Guizhou Province, Bijie 551700 , China;Guizhou Meteorological Observatory, Guiyang 550002 ,China;Qixingguan Meteorological Bureau of Bijie City of Guizhou Province, Bijie 551700 , China) |
| Abstract: |
| Xishui C-band dual-polarization radar and conventional meteorological observation data were used to analyze the strong convective weather characteristics of a hail and thunderstorm that occurred in Bijie on May 9, 2021. The results show that the stratification of the upper dry and cold lower warm and wet stratification makes the Bijie atmosphere stratified. Extremely unstable, the ground convergence line superimposed on the dew-point front uplift in the afternoon triggered convection to form an organized multi-cell strong storm. The reflectivity factor shows the characteristics of a typical strong storm-type thunderstorm, which is conducive to the generation and development of large hail. The dual-polarization radar parameters ZDR and CC can effectively identify the types of precipitation particles. The abnormally low correlation coefficient ρHV in the identified hail area can better reflect the characteristics of large hail or super hail. The emergence of gust fronts and the outflow of cold pools from the bottom of the storm monomer are the main reasons for the appearance of strong winds from Bailidujuan to Qianxi. In conjunction with the strong cyclone convergence of the lower layers on the radial velocity map, the strong ground winds intensify, resulting in Qianxi Extremely destructive windy weather. |
| Key words: dual polarization； strong convection； hail； gale；Bijie |
