气象Issue(5)：570-579,10.DOI:10.7519/j.issn.1000-0526.2014.05.007
梅雨锋短时大暴雨的多尺度环境场分析
Analysis on Multi-Scale Ambient Field for Short-Time Severe Torrential Rain on Meiyu Front
摘要
Abstract
By using conventional meteorological observation data,satellite data,NCEP FNL reanalysis da-ta,the severe rainstorm process which happened on 14 June,2011 in northern Jiangxi was analyzed in this paper.The results show that:(1)The severe rainstorm over Meiyu front happens in extremely favorable weather situations and frontogenesis and terrain result in the vigorous development of meso-βscale system. (2)With stable circulations,cold air flow behind the 500 hPa trough stands facing the warm and wet flow in south,continuously,causing to the rainstorm maintain over the northern part of Jiangxi.The favoura-ble ambient field for this event is formed by strong thermal instability,strong vertical wind sheer,plenti-ful water supply in low level and strong convergent lifting.(3)Co-operation between multi-scale systems makes extremely strong southwest jet and the strong ascending motion,strong divergence in higher-levels, strong convergence in lower-levels are coupled with the development of meso-scale system.All of these factors trigger the rainstorm happen on the Meiyu front.The positive vorticity develops upward along the front area ofθse ,which enhances convective ascending motion and releases lots of instable energy.(4) Main precipitation core located in northeast Jiangxi is due to the joining of air flows in different levels and the interaction between convergence at boundary layer and trumpet-shaped terrain.关键词
短时大暴雨/β中尺度系统/梅雨锋/地形Key words
short-time torrential rain/meso-βscale system/Meiyu front/terrain分类
天文与地球科学引用本文复制引用
郑婧,孙素琴,吴静,许爱华..梅雨锋短时大暴雨的多尺度环境场分析[J].气象,2014,(5):570-579,10.基金项目
中国气象局预报员专项（CMAYBY2012-30）和科技部科技支撑计划（2012BAK09B04）共同资助 （）
