| “7·18”济南突发性大暴雨特征 |
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| 引用本文： | 王瑾,蒋建莹,江吉喜.“7·18”济南突发性大暴雨特征[J].应用气象学报,2009,20(3):295-302. |
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| 作者姓名： | 王瑾 蒋建莹 江吉喜 |
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| 作者单位： | 国家卫星气象中心，北京100081 |
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| 基金项目： | 公益性行业(气象)专项 |
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| 摘 要： | 运用FY-2号气象卫星资料、NCEP再分析资料、常规资料以及自动站加密观测资料，对2007年7月18日济南市突发性大暴雨天气过程的形成发展进行了综合分析。结果显示:这次大暴雨发生在大气层结十分不稳定和高、低空急流耦合的有利大尺度环流背景下，由强烈发展的中尺度对流云团直接造成，具有明显的中尺度特征。低层冷空气南侵，触发了具有高不稳定能量的对流发展；低空强劲的西南急流直抵黄河下游一带，不仅与南下的冷空气形成强烈辐合，还将大量水汽和能量输送到该地区，使降水得以加强。
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| 关 键 词： | 突发性大暴雨 强对流云团 急流 冷空气 |
| 收稿时间： | 2008-01-17 |
A Jinan Heavy Rainfall on 18 July 2007 |
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| Wang Jin,Jiang Jianying and Jiang Jixi.A Jinan Heavy Rainfall on 18 July 2007[J].Quarterly Journal of Applied Meteorology,2009,20(3):295-302. |
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| Authors: | Wang Jin Jiang Jianying and Jiang Jixi |
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| Affiliation: | National Satellite Meteorological Center, Beijing 100081 |
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| Abstract: | Jinan is stricken suddenly by an extraordinary rainstorm on 18 July 2007. From 17:30 to 20:30, the maximum rainfall of the city exceeds 153.1 mm. An synthetic analysis of this heavy rain event is performed, using multiple data, including FY-2 double satellite data, NCEP 6-hour reanalysis data, routine observational data and automatic meteorological station data. The results show the heavy rainfall takes place under the favorable large-scale circumfluence, which includes the continental high pressure in west China developing eastward, and Jinan locates at the northeast of it. At the same time, coupling between a high level jet steam and a low level jet steam intensifies, and becomes strong divergence in the upper and strong convergence in the low over Jinan. The cold vortex in northeast China develops dramatically, and the cold air of its rear strengthens. The short wave trough at middle layer moves eastward, and lies over the shear-line in the low level. Both of them form the shape of forward trough. All of these lead together to atmospheric stratification around Jinan turning very unstable. This rainfall process is caused directly by strong meso-scale convective cloud, which is formed by the mergence of two deeply convective clusters at the tail of frontal clouds, and it shows a quasi-round shape structure of a horizontal scale of 200 km×200 km, and a time scale of no more than 5 hours. There is a meso-scale low pressure over the surface corresponding to the cloud. The heavy rain occurs during the rapid intensification stage of the meso-seale convective system. In addition, the transport of warm and moist southwest air current in the low-level leads heavy rain to develop strongly. This water channel extends northeastward and shows northeast-southwest orientation via Jinan, which provides plenty of water for rainfall. |
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| Keywords: | abrupt heavy rain strong convective cloud jet stream cold air |
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