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| 2007年7月18—19日山东省大暴雨天气分析 | |
| 引用本文： | 杨晓霞,王建国,杨学斌,孙军,杨成芳,盛春岩.2007年7月18—19日山东省大暴雨天气分析[J].气象,2008,34(4):61-70. |
| 作者姓名： | 杨晓霞 王建国 杨学斌 孙军 杨成芳 盛春岩 |
| 作者单位： | 1. 山东省气象台,济南,250031 2. 山东省气象局 3. 山东省德州市气象局 4. 国家气象中心 |
| 基金项目： | 国家气象中心科研开发课题 |
| 摘 要： | 应用常规观测资料、中尺度站资料、卫星云图、雷达回波和T213数值预报产品,对2007年7月18-19日山东省大范围对流性暴雨天气的成因进行了分析.分析了产生暴雨的天气系统特征,大气垂直稳定度和对流有效位能,产生暴雨的水汽条件和动力触发机制,给出了产生暴雨的对流云团演变特征.研究结果表明,对流性大暴雨是由东北冷性低涡、前倾槽、副热带高压边缘西南暖湿气流和冷空气的共同影响产生的.低层强盛的偏南气流建立起水汽通道,把水汽源源不断地向暴雨区输送.前倾槽结构和低层增温增湿使得大气强烈的对流不稳定和对称不稳定.低层较强的东北气流与强盛的西南暖湿气流侧向汇合,垂直涡度增大,辐合上升运动增强,对流不稳定能量释放,产生中尺度对流云团.地面冷锋前生成中尺度低压,加强了辐合上升运动.高层辐散与低层辐合相配合,有利于上升运动发展和维持.卫星云图中显示两个对流云团合并发展形成中尺度对流复合体(MCC).雷达回波中表现为两个东西向的带状强降水回波相衔接,缓慢南移;暴雨区上空东北气流、西北气流和西南气流相汇合;低层东北气流逐渐增大.冷空气从低层侵入. |
| 关 键 词： | 水汽输送 大气不稳定 冷空气侵入 中尺度对流复合体 对流性暴雨 |
| 收稿时间： | 2007/11/2 0:00:00 |
| 修稿时间： | 2007年11月2日 |
Analysis of Rainstorm Event over Shandong Province During 18-19 July 2007 |
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| Yang Xiaoxi,Wang Jianguo,Yang Xuebin,Sun Jun,Yang Chengfang and Sheng Chunyan.Analysis of Rainstorm Event over Shandong Province During 18-19 July 2007[J].Meteorological Monthly,2008,34(4):61-70. | |
| Authors: | Yang Xiaoxi Wang Jianguo Yang Xuebin Sun Jun Yang Chengfang and Sheng Chunyan |
| Institution: | Shandong Meteorological Observatory;Shandong Meteorological Bureau;Dezhou Meteorological Office;National Meteorological Center;Shandong Meteorological Observatory;Shandong Meteorological Observatory |
| Abstract: | By using routine observational data, meso scale observatioal data, sate llite cloud image, radar echo,T213 model products and diagnosis analysis means, the ra instorm event over Shan dong province during 18-19 July, 2007 is analyzed. The we ather system, vertical stability of atmosphere, convective available ene rgy, water vapor condition and dynamically triggering mechanism were discussed. The characteristic of convective clouds was worked out. The result shows that th e rainstorm was caused by the interaction of the cold vortex over northeast Chin a, westerly trough, the southwest warm and wet airflow on the edge of subtropica l high over the west Pacific and the cold air from the north. The strong southwe st airflow set up the water vapor channels where the water vapor can flow to Sha ndong province. The forward tilling trough and increase in the temperature and humidity in the low level atmosphere caused the intensively convective instabilit y and symmetrical instability, which provide sufficient water vapor and energy f or the rainstorm. The strong northeast winds converged with strong southwest air flow on low level atmosphere, so that the vertical vorticity increased, the conv ergence and ascending motion augmented, which trigger the instability energy rel eased, produced meso scale convective cloud mass and heavy precipitation. Meso scale low pressure formed before the ground cold front, so the convergence and as cending motion increased more and more, which resulted in MCC and rainstorm. |
| Keywords: | water vapor transportation atmospheric instability cold air invasion MCC rai nstorm |
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