【作者】 崔恒立； 王东仙； 牛奔； 李才媛；

【Author】 Cui Heng-li 1 ,Wang Dong-xian 1 ,Niu Ben 2 ,Li Cai-yuan 2 1.Jingmen Meteorological Bureau in Hubei Province, Jingmen 448000 2.Wuhan Central Meteorological Observatory, Wuhan 430074

【机构】 湖北省荆门市气象局； 武汉中心气象台；

【摘要】 利用NCEP1°×1°再分析资料和FY-2C卫星云图资料对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的共同作用,导致了这次强降雨的发生。(2)低层露点锋触发了本次强降水过程的中尺度天气系统。(3)本次强降水主要是由两个中尺度暴雨云团影响,两个暴雨云团间主要是后向传播。(4)后向传播暴雨云团的强降水区的两支下沉辐散气流有着十分重要的作用。一支气流与前侧气流交汇,使得低层辐合加强,加速前侧上升运动;另一支干冷气流与后侧暖湿气流交汇,触发新的中尺度系统,从而有新的暴雨云团生成。更多还原

【Abstract】 1°×1° NCEP reanalyze data and FY-2C satellite image 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 the warm moist southwesterly flow outside subtropical high.(2) Lower dew-point front trigger the heavy rain process of mesoscale weather system.(3)The heavy rain is influenced by two mesoscale clouds which are back-propagating.(4) The two sinking divergence airflows which takes place in heavy rain area of storm clouds is very important. One airflow joins front flows which enhances convergence in lower layers and accelerates upward movement, the other dry cleaning airflow joins warm moist air flow in back side which triggers new mesoscale weather system and new storm clouds are generated.更多还原