| 四川冕宁“6.26”暴雨的中尺度特征分析 |
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| 引用本文： | 罗辉,陈朝平,郭云云.四川冕宁“6.26”暴雨的中尺度特征分析[J].高原山地气象研究,2022,42(1):37-44. |
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| 作者姓名： | 罗辉 陈朝平 郭云云 |
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| 作者单位： | 1.四川省气象台, 成都 610072 |
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| 基金项目： | 气象预报业务关键技术发展专项（YBGJXM（2020）2A-14）；高原与盆地暴雨旱涝灾害四川省重点实验室青年专项（SCQXKJQN2020022）；中国气象局创新发展专项（CXFZ2021Z033） |
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| 摘 要： | 利用FY4卫星、天气雷达以及加密自动站资料，分析了冕宁“6.26”暴雨过程的中尺度特征。结果表明:700 hPa切变线、冷平流、强的不稳定能量以及不稳定层结等条件非常有利于强对流的发展；早期触发对流的关键系统为九龙一带的切变云系，云系在下山过程中触发对流云团，强降水始终位于强的亮温区南端，且短时强降水的发生时间比MCS发展最旺盛期滞后1 h；雷暴中产生的下沉气流导致地面阵风的不断增强与维持，同时与地面偏北冷空气配合，在冕宁南部一带形成明显的偏北风，进而在喇叭口地形和南侧的辐合处触发雷暴；新生雷暴在低层偏南风的作用下不断与北侧母体雷暴合并，形成了明显的后向传播特征，同时在山脉的阻挡作用下，雷暴长时间维持且移动缓慢，最终导致冕宁地区发生持续强降水。
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| 关 键 词： | 暴雨 触发 下沉气流 回波特征 |
| 收稿时间： | 2021-06-21 |
Mesoscale Characteristics of the Rainstorm in Mianning on June 26 |
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| Affiliation: | 1.Sichuan Provincial Meteorological Observatory, Chengdu 610072, China2.Heavy Rain and Drought-Flood Disaster in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China |
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| Abstract: | By Using FY4 satellite, weather radar and encrypted automatic station data, the mesoscale characteristics of the rainstorm in Mianning on June 26 were analyzed. The results show that: Shear line at 700hPa, cold advection, strong unstable energy, unstable stratification were very conducive to the development of strong convection. The key system of trigger convection in early stage was the shear cloud in Jiulong, which triggered convective cloud clusters as it descended the mountain. The strong precipitation area was located in the southern of the strong brightness temperature area, and the initial time of heavy rainfall lags behind the development time of MCS. Downdraft was generated in the thunderstorm, which led to the continuous increase and maintenance of the northerly gust on the ground, then new thunderstorms were triggered at the convergent point of the bell mouth topography and the southern convergence. Under the action of low-level southerly winds, the new thunderstorms continuously merged with the mother thunderstorms on the north side, forming obvious backward propagation characteristics. At the same time, under the blocking action of mountains, the thunderstorms maintained for a long time and moved slowly, which eventually led to the persistent heavy precipitation in Mianning . |
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