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气象:2007,33(9):64-68
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攀西地区“7.7”暴雨雷达回波演变特征剖析
(1.四川省凉山州气象台,西昌 615000;2.四川省气象台;3.西昌雷达站)
Anatomy of the Evolution of Radar Echo at “7.7” Heavy Rain in the Western Panzhihua
(1.Liangshan Meteological Observatory, Xichang 615000;2.Sichuan Meteological Observatory;3.Xichang Radar Station, Sichuan Province)
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投稿时间:2006-09-26    修订日期:2007-01-29
中文摘要: 通过对攀西地区2006年7月6—7日暴雨过程的环流形势及新一代天气雷达回波演 变特征分析表明:暴雨过程开始前本地大气中储存着丰富的不稳定能量,高低空风存在垂直 切变,在地面冷空气和青藏高原切变线触发下对流强烈发展形成大范围暴雨。强降水超级单 体风暴回波强度可达60dBz,暴雨回波长时间持续的主要机制是降雨回波不断地新生和合并 ,暴雨回波成熟时在强回波中存在较强的上升运动,暴雨云团中大于40dBz的强回波高度可 达9km,顶高超过12km,垂直液态含水量达45kg·m-2,与此相对应的速度图上 有逆风区、小气旋、辐合区等强降水特征出现。
中文关键词: 暴雨  雷达回波  特征分析
Abstract:The general circulation and the evolution characteristics of new gene ration radar echo of the heavy rain on Jul. 7,2006 (simply called as “7.7" r ainstorm) in the western Panzhihua (called Panxi) are analyzed in detail. The res ult shows that before raining, there was a plenty of unstable energy, and a vert ical westerly shear in the atmosphere. Near surface cold air and a shear line o ver the Tibetan Plateau triggered an intensive convection and led to a heavy rai n in a large area. The echo intensity of the super cell storm could reach to 60dBz . Long sustained radar echo was the result of new genesis and merging of the ec ho. During the mature stage of radar echo, significant ascending movement took pl ace within the strong echo area. The height of strong echo over 40dBz could be a s high as 9,000 meters with its top height above 12,000 meters. Meanwhile, the a mount of liquid water in the air column reaches 45kg·m-2and there were r everse wind, small size cyclone and convergence as seen in the velocity chart.
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邓波,顾清源,罗菊芳,2007.攀西地区“7.7”暴雨雷达回波演变特征剖析[J].气象,33(9):64-68.
Deng Bo,Gu Qingyuan,Luo Jufang,2007.Anatomy of the Evolution of Radar Echo at “7.7” Heavy Rain in the Western Panzhihua[J].Meteor Mon,33(9):64-68.