| 2019年4月9日四川东北部一次飑线大风的成因分析 |
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| 引用本文： | 李曦.2019年4月9日四川东北部一次飑线大风的成因分析[J].新疆气象,2020,14(4):52-60. |
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| 作者姓名： | 李曦 |
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| 作者单位： | 广安市气象局 |
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| 摘 要： | 本文利用常规观测资料、多普勒天气雷达资料、自动站观测资料等多种资料，对2019年4月9日发生在四川东北部的一次飑线大风天气进行了分析。结果表明：本次飑线大风天气过程为低层暖平流强迫类型，低层西南急流和暖脊使得热力不稳定增长，配合低槽东移影响，加强了大气层结的不稳定性，在地面辐合线的作用下，最终触发了本次飑线天气过程。飑线后部存在的中尺度雷暴高压和超强冷池，造成了强冷池密度流，利于产生大风；后向入流和低层显著干区加强了降水粒子的蒸发、冷却，形成了强烈的下沉气流；高空动量下传，对地面大风有增幅作用；飑线移动迅速，前向传播明显，有利于大风的产生。
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| 关 键 词： | 飑线大风、雷暴高压、强对流、动量下传 |
| 收稿时间： | 2019/6/21 0:00:00 |
| 修稿时间： | 2019/9/12 0:00:00 |
Causation Analysis of a Strong Squall Line Storm in Northeast Sichuan on April 9 in 2019 |
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| lixi.Causation Analysis of a Strong Squall Line Storm in Northeast Sichuan on April 9 in 2019[J].Bimonthly of Xinjiang Meteorology,2020,14(4):52-60. |
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| Authors: | lixi |
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| Institution: | Guangan Weather Bureau |
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| Abstract: | Based on the conventional sounding observation data,doppler radar data and automatic weatherstation observation data, a squall line storm that occurred in northeast Sichuan on april 9 in 2019 is analyzed and studyed.The results show that the severe convection weathe correlated with the warm advection forcing category.The southwest warm and humid air flow and the warm high ridge enhanced the conditional instability, the conditional instability was reinforced by the eastward of cold trough, this squall line was triggered by the ground convergence. The strong thunderstorm high and cold pool after squall front caused strong density flow which was conducive to the gale. Backward inflow and low-level dry area significantly enhanced the evaporation and cooling of precipitation particles, forming a strong downdraft. The momentum downward transmission at high altitude enhanced the ground gale. The squall line moved rapidly and propagates forward obviously, which was beneficial to he ground gale. |
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| Keywords: | Squall line gale thunderstorm high severe convection downward momentum transportation |
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