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中文摘要: 应用常规气象和卫星资料,对1998年7月21日发生在武汉附近地区的突发性特大暴雨过程进行了分析,结果显示:(1)引发本次突发性特大暴雨的系统是一个中 β 尺度对流云团。( 2 )该中 β尺度暴雨系统在对流层高低层没有独立的负、正涡度大值中心区与之对应,辐合层并不十分深厚(低于500hPa) ,且气流散合强度(10-4s-1)较旋转强度(10-5s-1)大一个量级(D>>ζ)。( 3)在暴雨发生前10余小时,大气运动已处于较强的非平衡状态,且越临近暴雨发生,U<0的非平衡性越强;而在暴雨达到强盛期后,大气运动即由U<0的非平衡态转为U>0的非平衡态。(4)对流层低层大气运动非平衡动力强迫与200hPa等压面上的中-β尺度强辐散是本例暴雨和中-β尺度暴雨系统发生发展的重要动力启动机制
中文关键词: 突发性暴雨，非平衡强迫，中尺度系统，动力诊断
Abstract:An abrupt heavy rain event occurred in Wuhan from 20 to 22 July 1998 is analyzed by using conventional and satellite data. The results show that: (1) The event was caused by a meso βscale convective cloud cluster. (2) The meso β scale system is not related with strong cyclone vorticity or ant cyclone vorticity center in lower or upper troposphere. The divergence strength of the system is higher 101s-1 than that of vorticity. (3) 10 hours before its occurrence, the atmospheric motion was already unbalanced. After the precipitation, its intensity got strongest and it changed into U >0 from U <0. (4) The unbalanced force of lower atmospheric motion and strong divergence in the upper atmosphere are led to the initiation and development of the meso-βscale system as well as the occurrence of heavy rain.
keywords: abrupt heavy rain,meso-β scale system,unbalanced force of atmospheric motion diagnostic analysis
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基金项目:国家自然科学基金(40275017)，四川省青年科技基金，暴雨监测与预测国家重点实验室经费资助
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引用文本：
陈忠明,徐茂良,闵文彬,高文良,2003.大气运动非平衡强迫与“98·7”突发性特大暴雨诊断分析[J].气象,29(12):3-9.
,2003.Diagnostic Analysis of Unbalanced Force of Atmospheric Motion and an Abrupt Heavy Rain during July 1998[J].Meteor Mon,29(12):3-9.
陈忠明,徐茂良,闵文彬,高文良,2003.大气运动非平衡强迫与“98·7”突发性特大暴雨诊断分析[J].气象,29(12):3-9.
,2003.Diagnostic Analysis of Unbalanced Force of Atmospheric Motion and an Abrupt Heavy Rain during July 1998[J].Meteor Mon,29(12):3-9.