| 攀西地区冕宁“6.26”突发性暴雨成因分析 |
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| 引用本文： | 陈永仁,李跃清.攀西地区冕宁“6.26”突发性暴雨成因分析[J].高原山地气象研究,2021,41(4):8-17. |
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| 作者姓名： | 陈永仁 李跃清 |
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| 作者单位： | 1.中国气象局成都高原气象研究所，成都 610072 |
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| 基金项目： | 中国科学院战略性先导科技专项（A类）（XDA23090103）； 四川省科学技术重点研发项目(2021YFS0326)； 国家自然科学基金重大研究计划集成项目（91937301） |
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| 摘 要： | 相比一般暴雨，突发性暴雨一直是天气预报与研究的难点和重点。2020年6月26日19时~27日02时四川攀西地区凉山冕宁突发暴雨，造成了严重灾害。为了深入认识此次暴雨过程成因，应用观测试验、卫星遥感和ERA5再分析资料，对这次冕宁“6.26”突发性暴雨过程的温、湿环境及动力特征进行了分析研究。结果表明:（1）此次暴雨是由迅速加强的MCS造成，且诱发MCS的温、湿环境具备“突发性”。在暴雨前6~12h，CAPE快速增大、可降水量增加、“上干下湿”垂直结构及热力不稳定条件得以建立。（2）强烈的上升运动在中高层气旋性涡度向低层发展增强的过程中形成，低层气旋性涡度发展又伴随强烈的上升运动，与区域地形相关的动力条件的建立和加强对强对流维持及突发性暴雨发生有重要作用。（3）暴雨过程发生在低层螺旋度与水汽耦合的最佳时段，垂直螺旋度与水汽耦合作用的增强，更易于引发暴雨过程，动力?水汽耦合对暴雨具有重要的激发作用，且湿螺旋度对暴雨落区更具有指示意义。
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| 关 键 词： | 冕宁 突发性暴雨 中尺度对流系统 地形作用 |
| 收稿时间： | 2021-09-02 |
Cause Analysis of an Abrupt Rainstorm on June 26, 2020 in Mianning of Panxi Region |
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| Institution: | 1.Institute of Plateau Meteorology, CMA, Chengdu 610072, China2.Meteorological Disaster Defense Technology Center of Sichuan Province, Chengdu 610072, China3.Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China4.Severe Weather Key Laboratory of Northeast Sichuan , Nanchong 637100 , China |
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| Abstract: | Compared with the common rainstorms, abrupt rainstorms are still the difficult and weak point in weather forecasting and research. From 19:00 on June 26 to 02:00 on June 27, 2020, an abrupt rainstorm occurred in Mianning, Liangshan of Sichuan, and caused serious disasters. To further investigate the cause of this rainstorm, the data from observation experiment, satellite remote sensing and ERA5 reanalysis were used to analyze the humid-thermal environment and dynamic characteristics of the abrupt rainstorm process. Results showed that: (1) The rainstorm was caused by a rapidly strengthened MCS (Mesoscale convective system), and establishment of the humid-thermal environment that induced the MCS had a "sudden" feature, that was within 6 to 12 hours before the occurrence of the rainstorm, the CAPE (convective available potential energy) increased rapidly, the amount of precipitable water continuously increased, the humidity structure of “the dry upper level—the wet lower level” and thermally unstable state could be established. (2) A strongly ascending movement was formed during the cyclonic vorticity development and enhancement from mid-upper level to the low level, and the development of low-level cyclonic vorticity was also accompanied by a strong ascending motion, the establishment and enhancement of dynamic conditions which was related to regional topography, played an important role for the maintenance of strong convection and the occurrence of the abrupt rainstorm. (3) The rainstorm process just occurred in the best period of the coupling between low-level helicity and water vapor, and the enhancement of the coupling between vertical helicity and water vapor make it easier to trigger the rainstorm process. The dynamic-water vapor coupling has an important stimulating effect on the rainstorm, and the moist helicity is more indicative for rainstorm area. |
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