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气象:2010,36(11):18-25
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滁州地区不同类型特大暴雨过程的对比分析
(1.南京大学大气科学学院, 南京 210093;2.安徽省气象台, 合肥 230031;3.安徽省气象台, 合肥 230031;4.国家气象中心, 北京 100081)
Comparison of Different Types of Heavy Rainfall Events in Chuzhou Region, Anhui Province
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投稿时间:2009-04-09    修订日期:2010-07-13
中文摘要: 利用常规探测资料、多普勒雷达资料和NCEP 1°×1°的再分析资料对安徽省滁州地区2008年8月1日减弱台风特大暴雨(简称“0808”过程)和2003年7月5日梅雨期特大暴雨(简称“0307”过程)进行了诊断对比分析。结果表明:超低空急流的增强对暴雨尤其是夜间暴雨的形成有提示作用;两次过程中都有次级环流的存在,作用方式有所不同,对高低空系统都有加强作用;其中“0808”过程中减弱台风携带的大量水汽对特大暴雨产生有重要作用,不需要很强的水汽输送就能产生强降水;特大暴雨强的水汽辐合中心都位于边界层内;冷空气的侵入对特大暴雨有重要作用;长时间降水回波的停滞是 “0307”过程的主要原因。由强风暴造成的对流降水是“0808”过程在多普勒雷达产品上的主要特征。
Abstract:Based on the conventional observation data, Doppler radar data and NCEP (1°×1°) reanalysis data, the causes for weakened typhoon generated heavy rainfall on 8 August, 2008 (called “0808” process for short) and Meiyu period heavy rainfall on 4 July, 2003 (called “0307” process for short) in Chuzhou, Anhui Province are diagnosed and analyzed. The diagnostic results show that the enhancing of low level jet can prompt heavy rainfall, especially heavy rainfall happening during night. In these two heavy rainfall events there exist secondary circulations, but the modes of their action are different, they both enhance high and low level weather systems. A great amount of water vapor from the weakened typhoon plays an important role in the “0808” process, and a strong water vapor transport is not necessary for producing heavy precipitation. Meanwhile the strong water vapor convergence center of heavy rainfall is located in the boundary layer, and cold air is important for heavy rainfall. During the “0307” process, radar precipitation echoes stay for long time. And the main feature of “0808” process in Doppler radar is that severe storms lead to convective precipitation.
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基金项目:2009年公益类行业专项 “中尺度对流性天气诊断分析方法研究” (GYHY200906003)、中国气象局新技术推广项目(CMATG2007M35)、中国气象局气象新技术推广预报员专项‘0801’苏皖强降水与‘凤凰’台风的关系”共同资助
引用文本:
姚晨,张雪晨,毛冬艳,2010.滁州地区不同类型特大暴雨过程的对比分析[J].气象,36(11):18-25.
YAO Chen,ZHANG Xuechen,MAO Dongyan,2010.Comparison of Different Types of Heavy Rainfall Events in Chuzhou Region, Anhui Province[J].Meteor Mon,36(11):18-25.