【作者】 王登炎； 周小兰；

【Author】 Zhou Xiaolan;Wang Dengyan;Wuhan central meteorological observatory;

【机构】 武汉中心气象台；

【摘要】 详细分析了1981-2003年6-8月发生在川鄂的14场区域性特大暴雨过程的卫星云图和天气图,发现在特大暴雨过程中,不仅存在着大量的水汽输送,而且存在着大量的液态水输送,表现为特大暴雨区的上游方向存在一个或几个中尺度的水汽和液态水源地,向暴雨区汇集;特大暴雨的触发系统对应的云系多为中尺度涡旋云系和准纬向斜压叶云系。总结出了区域性特大暴雨的若干环境云场卫星云图和形成过程的物理图象,研究了特大暴雨形成的机理,发现特大暴雨是由高原涡旋云系或准维向斜压叶云系东移叠置在"露点锋"上或暖湿空气上,触发而成,CISK是其主要作用机理,"露点锋"在特大暴雨的触发中起到了重要作用,但不是特大暴雨的必要条件。这一发现为区域性特大暴雨的短期预报和短时预报提供了依据。更多还原

【Abstract】 Satellite image of 14 cases Regional Excessive Heavyrain occurred in Hubei province from 1981 to 2002 had been analysised. carefully. Not only water vapour transfer but also liquid water transfer had been found. It had been found that the trigger cloud system of Regional Excessive Heavyrain were quasi-zonal baroclinic leaf cloud system and vortex cloud system. Ambient cloud fields and four image patterns of Regional Excessive Heavyrain had been induced.These will offer evidence for short range forecast and Nowcasting of Regional Excessive Heavyrain.更多还原