| 一次弱对流天气降雹成灾的雷达回波特征分析 |
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| 引用本文： | 谢向阳,程相儒,李建刚.一次弱对流天气降雹成灾的雷达回波特征分析[J].新疆气象,2008,2(5):32-34. |
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| 作者姓名： | 谢向阳 程相儒 李建刚 |
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| 作者单位： | 五家渠市气象局 |
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| 摘 要： | 通过对新疆玛河流域一次冰雹天气雷达资料及地面实况资料的分析，研究弱对流云降雹的雷达反射率因子与径向速度场的回波特征，进一步探讨弱对流云降雹与0℃层高度较低及垂直风切变的关系：弱对流天气当日零度层高度值可作为分析弱冰雹云的依据；高低空风速的差异形成的风切变造成的动压力产生垂直加速度，使对流运动得到加强和维持，也是此次降雹的动力机制。分析此次天气，揭示了新疆玛河流域弱对流云降雹天气过程生消的一些重要特征和变化，对雹云的识别和分析具有一定的指导意义。
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| 关 键 词： | 弱对流天气 降雹成灾 雷达回波特征 |
Analyze on the Hail Radar Echo Characters of a Weak Convective Weather Process |
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| XIE Xiang-yang,CHENG Xiang-ru,LI Jian-gang.Analyze on the Hail Radar Echo Characters of a Weak Convective Weather Process[J].Bimonthly of Xinjiang Meteorology,2008,2(5):32-34. |
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| Authors: | XIE Xiang-yang CHENG Xiang-ru LI Jian-gang |
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| Institution: | XIE Xiang-yang, CHENG Xiang-ru, LI Jian-gang (Wujiaqu Meteorological Bureau, Wujiaqu 831300, China) |
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| Abstract: | Analyzing the data of radar and ground observation for a hail convective weather in Mahe valley of Xinjiang, we study the characters of radar reflectivity factor and vertical velocity field for weak convective hail cloud, and the relationship among the weak convective hail cloud, the lower 0℃ layer height and vertical wind shear. The results show that the height of 0℃ layer is the main essential for to analyze weak convective hail cloud, and the wind shear resulting from difference between high and low-level wind speed forms vertical acceleration, it makes convective movement strengthen and maintain, this is the dynamical mechanism for this hail weather process. By Analyzing this weak convective hail weather process, some important features and changes is revealed for weak convective hail weather occurrence and disappearance in Mahe valley of Xinjiang, and these analyses have the certain guiding significance for to identify and analyze hail cloud in future. |
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| Keywords: | weak convective weather hail disaster radar echo characters |
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