| 一次后向传播对流风暴特征及传播机制 |
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| 引用本文： | 武冰路,尹泽疆,王萌,秦睿,程月星.一次后向传播对流风暴特征及传播机制[J].气象科技,2020,48(6):836-845. |
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| 作者姓名： | 武冰路 尹泽疆 王萌 秦睿 程月星 |
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| 作者单位： | 中国气象局气象干部培训学院河北分院,保定 071000;北京城市气象研究院,北京 100089;北京市朝阳区气象局,北京 100016 |
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| 基金项目： | 河北省科技计划重点研发项目（19210310D）资助 |
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| 摘 要： | 利用常规观测资料、FY 4A气象卫星红外云图以及多普勒天气雷达资料，分析了2019年5月17日夜间发生在京津冀中部伴有强冰雹、短时强降水和短时大风的强对流天气过程。利用VDRAS资料与国家自动站资料进一步揭示对流风暴形成的环境条件以及后向传播的机制。结果表明：在有利于强对流发生发展的大尺度环流背景场下，京津冀中部的对流系统迅速发展。前期京津一带的强对流天气形成较强的东北风冷池出流，与渤海湾的东南气流交汇，在廊坊北京交界一带形成了向南移动的地面辐合线,并触发了对流。由于新生风暴单体与成熟风暴之间的正反馈作用，使得在廊坊北部形成东西向带状风暴系统，造成对流风暴不断向西传播。向西传播的风暴与西北东南向的平流共同作用，最终导致风暴运动方向为西南方向，成为典型的后向传播风暴。
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| 关 键 词： | 对流风暴 后向传播 超级单体风暴 VDRAS 冷池出流 |
| 收稿时间： | 2020/1/8 0:00:00 |
| 修稿时间： | 2020/5/6 0:00:00 |
Characteristics and Propagation Mechanism of a Backward Propagation Convective Storm |
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| WU Binglu,YIN Zejiang,WANG Meng,QIN Rui,CHENG Yuexing.Characteristics and Propagation Mechanism of a Backward Propagation Convective Storm[J].Meteorological Science and Technology,2020,48(6):836-845. |
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| Authors: | WU Binglu YIN Zejiang WANG Meng QIN Rui CHENG Yuexing |
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| Abstract: | By using the conventional meteorological data, infrared cloud images of th FY4A satellite and doppler meteorological radar data, this paper analyzes a severe convective weather case occurred on 17 May 2019 in the central Beijing Tianjin Hebei region, accompanied by a strong hail, short term heavy precipitation and short term strong winds. To further reveal the environmental conditions of the convective storm formation and the mechanism of backward propagation, the Variational Doppler Radar Analysis System (VDRAS) and meteorological data of a national automatic weather station are used. The results show that under the large scale background field being favorable for the occurrence and development of strong convection, the convection system around the central Beijing Tianjin Hebei region developed rapidly. The convection system was triggered by a southward moving ground convergence line at the Beijing Langfang border, which was the confluent area between the southeast air flow from the Bohai Bay and the strong northeast cold air flow generated by the cold pool formed by the strong convection weather in the Beijing Tianjin region earlier. It is shown as a backward propagating multi cell storm. The main reasons for the backward propagation are the strong wind shear in lower atmosphere (0 to 3 km) and the positive feedback effect between new and old storm cells. |
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| Keywords: | convective storm backward propagation super cell storm VDRAS (Variational Doppler Radar Analysis System) cold pool outflow |
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