| 大连地区一次暴雨过程的成因分析 |
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| 引用本文： | 赵繁盛,赵惠芳.大连地区一次暴雨过程的成因分析[J].安徽农业科学,2010,38(32):18343-18346,18432. |
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| 作者姓名： | 赵繁盛 赵惠芳 |
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| 作者单位： | 1. 辽宁省大连市气象局,辽宁大连,116001
2. 福建省晋江市气象局,福建晋江,362200 |
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| 摘 要： | 2006年7月10日辽东半岛地区出现了暴雨或大暴雨天气,利用常规的天气资料、卫星云图以及MM5模式,对发生在大连地区的这次暴雨天气进行天气形势、水汽条件、动力条件等分析。结果表明,这是一次由高空槽、副高后部切变云系、北上台风的外围云系、地面倒槽相互作用引起的对流天气过程。切变线云系中不断产生并发展加强的多个中-β尺度对流云团是这次过程的直接中尺度系统。MM5模式模拟结果分析揭示了造成此次暴雨时,对流层低层存在很强的西南低空急流,台风充足的水汽配合低层旺盛的西南流场为雨区输送水汽和热量;切变线结构为低层有辐合中心,高层有辐散中心,垂直运动场上对应有强上升运动,为暴雨提供动力条件;暴雨区上空存在着较深厚的高湿水汽柱和高温层,为暴雨的产生提供充足的水汽和能量。暴雨区高层有明显冷气流侵入是产生暴雨天气的触发机制;副热带高压的位置及强度变化对这次暴雨的产生和发展起着重要的作用。
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| 关 键 词： | 暴雨 对流云系 MM5模式 水汽输送 |
Analysis on Causes of a Rainstorm Process in Dalian |
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| ZHAO Fan-sheng et al.Analysis on Causes of a Rainstorm Process in Dalian[J].Journal of Anhui Agricultural Sciences,2010,38(32):18343-18346,18432. |
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| Authors: | ZHAO Fan-sheng |
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| Institution: | ZHAO Fan-sheng et al (Dalian Meteorological Bureau,Dalian,Liaoning 116001) |
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| Abstract: | The weather situation,water vapor conditions and active conditions of a rainstorm weather on July 10,2006 in Dalian were analyzed by using conventional meteorological data,cloud image and MM5 model,it was found out that the rainstorm was a convection weather caused by the interactive action of upper through,shear cloud behind subtropical high,peripheral cloud system of north forwarding typhoon and surface through.The multiple meso-β scale convective cloud continuously emerging and enhancing from shear cloud was the direct mesoscale system of this rainstorm.The analysis results of MM5 model exposed that,during this rainstorm process,there was strong south-west low-level jet in the lower troposphere,plenty water vapor of typhoon and southwest flow transported water vapor and heat to the precipitation area;the structure of shear line was characterized by lower convergence center and upper divergence center,intensive ascending motion over the vertical motion field provided powder conditions for rainstorm;the thick water vapor column and heat layer over the precipitation area provided abundant water vapor and energy for the generation of this rainstorm.The intrusion of cold air in the precipitation area was the trigger mechanism;while the location of subtropical high and its intensity change also played an important role in this rainstorm. |
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| Keywords: | Rainstorm Convective clouds MM5 model Water vapor transport |
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