摘要
利用常规天气图、FY-2D卫星云图、单站地面资料、NCEP再分析物理量场资料,对2013年8月6日发生在甘肃武威市对流性强降雨天气成因进行了诊断分析。结果表明:强降雨是在一定的大尺度环流背景下高低层天气系统共同作用下发生的,地面气象要素的剧烈变化是强对流天气能量的释放过程;湿度条件和水汽在本地辐合为大到暴雨提供了充沛的水汽;高层辐散、低层辐合以及强烈的上升气流是大到暴雨发生的动力条件;强烈的不稳定能量和不稳定层结是对流增强、雨强较大的必要条件;对流云团的发展和加强是降雨强度较大的直接原因。
Based on the conventional weather charts,FY-2D satellite images,surface meteorological data,physical quantity field and NCEP reanalysis data,a heavy rainfall process which occurred on August 6,2013 in Wuwei of Gansu Province was systematically diag-nosed. The results show that the heavy rainfall was caused by interaction of multiple factors under a certain large-scale circulation background. Dramatic change of surface meteorological factors was an energy release process of strong convection weather. Local highhumidity and moisture convergence provided an abundant moisture source. High-level divergence,low-level convergence and strong rising motion were the dynamic conditions. Strong unstable energy and unstable stratification were the necessary conditions of enhancing the convection enhancement and rainfall intensity increase. Development and strengthening of convective cloud clusters resulted in heavy rainfall process.
出处
《干旱气象》
2015年第1期149-155,共7页
Journal of Arid Meteorology
基金
干旱气象科学研究基金"石羊河流域干旱灾害风险评估及防御对策研究"(IAM201205)
科技部行业(气象)专项"农田水分利用效率对气候变化的响应与适应技术"(GYHY201106029)共同资助
关键词
大到暴雨
环流形势
物理量场
诊断分析
对流云团
heavy rainfall
circulation situation
physical quantity filed
diagnosis analysis
convective cloud clusters
