| 贵州大暴雨个例形成机制数值模拟 |
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| 引用本文： | 伍红雨,吴战平,徐丹丹.贵州大暴雨个例形成机制数值模拟[J].气象科技,2008,36(5):529-535. |
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| 作者姓名： | 伍红雨 吴战平 徐丹丹 |
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| 作者单位： | 贵州省气象局山地环境气候研究所,贵州省山地气候与资源重点实验室,贵阳,550002 |
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| 基金项目： | 中国气象局资助项目，贵州省科学技术基金 |
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| 摘 要： | 利用3层嵌套的中尺度数值模式MM5 V3.5,模拟了2007年6月24～25日发生在贵州中南部的一次大暴雨过程.利用模式输出的高分辨率资料,对这次暴雨天气及中尺度低涡的形成机制进行了诊断分析.模式较成功地模拟出了中尺度系统的演变和降水的分布特征.中尺度低涡的发展、稳定维持是造成贵州这次大暴雨天气的直接原因.暴雨、大暴雨出现在低涡的西南侧.在低层正涡度、辐合、强烈的上升运动和高层负涡度、辐散的有利配置下,形成深厚的上升运动柱,这种中尺度动力配置结构,不仅与暴雨区和暴雨发生时段相对应,而且是引起此次暴雨的中尺度低涡发展和持续的动力机制之一.暴雨区与强烈上升运动区,正涡度区相对应.
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| 关 键 词： | 大暴雨 形成机 制数值模拟 中β尺度系统 低涡 |
| 收稿时间： | 2007/7/23 0:00:00 |
| 修稿时间： | 2007/9/11 0:00:00 |
Formation Mechanism Analysis and Numerical Simulation of a Heavy Rain in Guizhou Province |
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| Wu Hongyu,Wu Zhanping and Xu Dandan.Formation Mechanism Analysis and Numerical Simulation of a Heavy Rain in Guizhou Province[J].Meteorological Science and Technology,2008,36(5):529-535. |
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| Authors: | Wu Hongyu Wu Zhanping and Xu Dandan |
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| Abstract: | The heavy rain process in the southern Guizhou Province during 24, 25 June 2007 was simulated successfully by using the three level nested mesoscale numerical model MM5 V3.5. By means of the simulated high resolution output data, the formation mechanisms of a heavy rain and the mesoscale low vortex were analyzed and diagnosed. It is shown that the model can successfully simulate the development of mesoscale systems and the distribution characteristics of precipitation. The development and maintenance of a mesoscale low vortex is the direct cause of the heavy rain. Heavy rainfall occurred in the southwest of a low vortex. A deep ascending motion column formed under the favorable condition: atmosphere positive vorticity, convergence, and strong ascending motion at lower levels, while atmosphere negative vorticity and divergence at upper levels. The mesoscale dynamical structure had a good relation to the occurrence time and location of heavy rainfall and was one of the dynamic mechanisms of maintaining and growing of the mesoscale low vortex. The area of heavy rainfall corresponded well to the strong ascending motion and the positive vortex areas. |
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