一次梅雨锋暴雨与中-β尺度低涡及小高压的关系  

RELATIONSHIPS BETWEEN A MEIYU FRONT RAINSTORM AND THE MESO-β-SCALE VORTEX AND MESOSCALE HIGH

作　　者：孙素琴[1] 于爱兵 郑婧[1] 

机构地区：[1]江西省气象台,江西南昌330046 [2]河北省气象台,河北石家庄050021

出　　处：《气象与减灾研究》2012年第2期23-30,共8页Meteorology and Disaster Reduction Research

基　　金：国家科技部科技支撑项目(编号:2012BAK09B04);科技部公益性行业(气象)科研专项(编号:GYHY201106003);江西省科技支撑计划项目(编号:20111BBG70031-4)

摘　　要：利用NCEP再分析资料、常规观测资料和WRF中尺度数值模式,对2010年6月19—20日江西特大暴雨过程进行数值模拟及诊断分析。结果表明,此次过程中,中-β尺度小高压的维持和破坏对雨带的生成与发展有显著的影响。由于小高压的存在,阻挡了北方弱冷空气南下,不利于强降水发生。当小高压减弱消失时,冷、暖气流的交汇引发强烈辐合上升运动,从而触发强降水。中-β尺度小高压的产生维持、消亡与高空急流的非地转质量调整有关。中尺度低涡的稳定维持、弱冷空气南下、高空急流动量南扩、低层西南急流维持等多个因素共同导致了大暴雨的产生。A Meiyu rainstorm process, occurred in 19--20 June 2010, is simulated and analyzed by using the NECP reanalysis data, conventional meteorological observation data and the WRF mesoscale numerical model. The results show that the maintenance and collapse of the meso-β-scale high significantly effect on the formation and development of the rain band during this process. The existence of meso-β-scale high blocks the cold air moving down south, which is not propitious to heavy rain occurrence. However, when meso-β-scale high weakens or even disappears, the meeting of cold and warm air may cause strong convergence ascending motion, and trigger heavy rain occurrence. The formation and disappearance of the meso-β-scale high is related to the ageostrophic mass adjustment of upper level jet stream. The extraordinary rainstorm is caused by the interaction of many factors, such as the formation and maintenance of meso-vortex, weak cold air activities, south down of the upper level jet stream momentum, and the maintenance of low-level SW jet.

关 键 词：暴雨 低涡 小高压 急流 耦合 

分 类 号：P458.121.1[天文地球—大气科学及气象学]