| 重庆2008年7月21日强对流天气成因及其特征 |
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| 引用本文： | 牟容,余君,刘德.重庆2008年7月21日强对流天气成因及其特征[J].气象,2009,35(5):49-54. |
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| 作者姓名： | 牟容 余君 刘德 |
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| 作者单位： | 1. 重庆市气象台,401147
2. 重庆市气象信息与技术保障中心 |
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| 摘 要： | 对2008年7月21日重庆市一次强对流天气过程进行诊断分析,通过分析天气背景,雷达回波,并应用四维变分同化方法反演风场,研究了强对流天气的发展机制.结果表明:高层冷空气入侵和中低层低涡系统强盛的暖湿气流形成的辐合切变是发生强对流的主要原因.雷达观测具有明显的弱回波区和"逆风区";反演水平风场表现为低层强回波前部有一条辐合上升带,到中层辐合上升带与强回波区重合,高层则对应辐散区;从风场的垂直剖面来看,强对流后部为入流区,到达中部后,形成强烈的上升气流,低层辐合带和强烈的上升气流形成强回波.在前部弱回波区处存在强降水下落形成的出流,该气流与暖湿气流辐合造成了浅薄的出流边界.
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| 关 键 词： | 低涡 辐合 列车效应 逆风区 四维变分同化 出流边界 |
| 收稿时间： | 2008/11/5 0:00:00 |
| 修稿时间： | 2009/2/18 0:00:00 |
Analysis on Causation and Character of a Strong Convection Event on 21 July 2008 in Chongqing City |
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| Mu Rong,Yu Jun and Liu De.Analysis on Causation and Character of a Strong Convection Event on 21 July 2008 in Chongqing City[J].Meteorological Monthly,2009,35(5):49-54. |
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| Authors: | Mu Rong Yu Jun and Liu De |
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| Institution: | 1.Chongqing Meteorological Observatory;401147;2.Chongqing Meteorological Information Center |
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| Abstract: | A strong convection event on 21 July 2008 in Chongqing City was diagnosed. The developing mechanism of the strong convection weather was studied with the background of weather, the echoes of radar and the wind field computed by 4D-VAR technique. The results indicate that the strong storm was caused by atmospheric convergence, which was brought by upper cold air inrush and lower warm-wet airflow intersection. Observation of radar shows that there were a weak echo field and "adverse wind region". Low level wi... |
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| Keywords: | low vortex convergence train effect adverse wind region 4D-VAR outflow border |
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