| 广州白云机场一次微下击暴流引起的低空风切变过程分析 |
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| 引用本文： | 郭智亮,谢文锋,钟加杰.广州白云机场一次微下击暴流引起的低空风切变过程分析[J].新疆气象,2019,13(4):71-78. |
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| 作者姓名： | 郭智亮 谢文锋 钟加杰 |
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| 作者单位： | 中国民用航空中南地区空中交通管理局气象中心;中山大学大气科学学院 |
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| 摘 要： | 对2017年8月1日在广州白云机场产生的42.1 m/s强阵风成因进行分析,发现此次强阵风是微下击暴流的下沉气流到达地面造成的。利用广州白云机场的地面自动观测资料和C波段多普勒天气雷达资料分析微下击暴流经过机场时地面各气象要素的演变特征以及产生强风切变的对流单体的移动和强度演变情况。分析表明:微下击暴流到达地面后造成了强烈的风速和风向的低空风切变,气压骤升,温度迅速降低,利用高时空分辨率的地面自动观测数据可以发布低空风切变的告警;在微下击暴流产生强地面风前,对流风暴单体的雷达回波反射率强度突然降低、回波顶高减弱,径向速度图上出现了中气旋以及在近地层有强烈的反气旋辐散,可利用多普勒天气雷达发布低空风切变的预警。
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| 关 键 词： | 广州白云机场 强阵风 微下击暴流 低空风切变 自动观测系统，多普勒雷达 |
| 收稿时间： | 2018/11/1 0:00:00 |
| 修稿时间： | 2019/3/20 0:00:00 |
Analysis on a low-level wind shear event under a microburst in Guangzhou Baiyun Airport |
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| GUO ZHI LIANG,and.Analysis on a low-level wind shear event under a microburst in Guangzhou Baiyun Airport[J].Bimonthly of Xinjiang Meteorology,2019,13(4):71-78. |
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| Authors: | GUO ZHI LIANG and |
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| Institution: | Meteorological Center of Middle South Regional Air Traffic Management Bureau of CAAC,, |
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| Abstract: | Based on the analysis of the cause of the strong gust of 42.1m/s generated at Guangzhou Baiyun Airport on August 1, 2017, it was found that the strong gust was caused by the downdraft of the micro-downburst. By using the ground automatic observation data and C-band Doppler radar data of Guangzhou Baiyun Airport, the evolution characteristics of meteorological elements on the ground and the movement and intensity evolution of convective monomers during the micro-downburst passing through the airport are analyzed. The result shows that when the micro-downburst reaches the ground, the air pressure rises rapidly and the temperature decreases rapidly, Also it causes the strong wind speed and low-level wind shear. The warning of low-level wind shear can be issued by using the ground automatic observation data with high spatial and temporal resolution. Before the strong surface wind is produced by the micro-downburst, the radar echo reflectivity intensity and the echo top height of the convective storm unit suddenly decreases. The Mesocyclone appears on the radial velocity map, and there is a strong anticyclone divergence in the near-surface layer. These factors can be used to issue early warning of low-level wind shear. |
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