| 鄂东一次大暴雨过程的成因分析 |
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| 引用本文： | 王东仙,崔恒立,牛奔.鄂东一次大暴雨过程的成因分析[J].高原山地气象研究,2017,37(2):16-21. |
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| 作者姓名： | 王东仙 崔恒立 牛奔 |
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| 作者单位： | 1. 湖北省荆门市气象局, 荆门 448000; |
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| 基金项目： | 中国气象局预报员专项(CMAYBY2016-045) |
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| 摘 要： | 利用NCEP1°×1°再分析资料、卫星云图TBB资料和逐小时地面降水资料对2012年7月12~13日发生在湖北东部地区一次大暴雨过程进行了分析,结果表明:(1)在华北横槽转竖带动冷空气南下的过程中,中低层有中尺度低涡的发生发展,中尺度低涡的稳定维持与副高外围西南暖湿气流共同作用,导致了这次强降雨的发生。(2)鄂东强降水主要由两个中尺度暴雨云团影响,前一个暴雨云团为MCC,受副高外围西南气流向偏东方向移动,后一个暴雨云团受冷空气影响向东南方向移动。(3)低层露点锋与本次强降水天气过程的发生发展有较好的对应,锋区北侧偏北气流穿越露点锋,使得低层气旋式涡度增大、辐合加强。(4)本次过程干湿空气的相互作用形成能量锋区,锋区的维持和加强导致了强降水的发生。
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| 关 键 词： | 大暴雨 中尺度低涡 露点锋 暴雨云团 |
| 收稿时间： | 2017-03-30 |
Analysis of a Heavy Rain Weather Process in East Hubei |
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| Affiliation: | 1. Jingmen Meteorological Bureau, Jingmen 448000, China;2. Wuhan Central Meteorological Observatory, Wuhan 430074, China |
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| Abstract: | 1°×1° NCEP reanalyze data and FY-2C satellite image TBB data are used to analyze a rainstorm process which took place in east Hubei on 12 July to 13 July 2012, The result shows that: (1) The cold art downed south while horizontal trough turned into vertical trough, the heavy rain is influenced by the mesoscale vortex development in lower layers, the stability of the mesoscale vortex and warm wet flow coming from southwest which is outside of Subtropical Anticyclone. (2) The heavy rain of east Hubei province mainly composed of two mesoscale heavy rain cloud clusters, the first rain cloud moving east because of southwest airflow outside the subtropical high peripheral was MCC, the second one moving southeast because of the cold air. (3) there was a good corresponding relation between the Lower dew-point front and the development of the heavy rain, The northern airflow through the front dew point, making low-level positive vorticity increase and development of small and medium scale vortex. (4) The interaction of dry and wet air which formed energy frontal zone, the strengthen and maintain of the energy front lead to the occurrence of the heavy rain. |
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