2010年“6.15”闽西大暴雨过程中尺度特征分析  

Mesoscale Characteristic Analysis of the Rainstorm Occurring in West Fujian on June 15,2010

作　　者：冯晋勤 石燕[2] 罗小金 王龙海 

机构地区：[1]福建省龙岩市气象局,龙岩364000 [2]中国气象局武汉暴雨研究所,武汉430074

出　　处：《暴雨灾害》2010年第4期337-343,共7页Torrential Rain and Disasters

基　　金：福建省科技厅区域重大项目(2009Y3005);福建省自然科学基金项目(2010J01244)

摘　　要：利用常规观测资料、NCEP 1°×1°再分析资料、卫星云图、新一代天气雷达以及区域自动站资料,分析2010年6月15日福建省龙岩市一次大暴雨过程中尺度特征。结果表明:此次降水过程是在高空槽东移,低层强劲西南急流背景下产生的,主要强降水发生在低空切变线右前侧和低空西南急流出口左侧;此次过程暴雨落区位于层结不稳定的湿区中(θse≥348K),低层辐合、高层辐散明显;雷达回波分析表明,西南急流加强(减弱)对强降水的发生(减弱)有较强的指示作用。对于其中的五个中尺度雨团,在雷达回波上表现为中高空有冷平流入侵,中低层的中尺度辐合、中尺度风切变、西南急流以及逆风区。地面流场中的中尺度辐合线,对未来强降水落区有一定的预报提前量。By using the conventional observation data,NCEP 1°×1° reanalysis data,satellite pictures,CINRAD/SA data and automatic weather station data,the mesoscale characteristic of the rainstorm occurring in the west of Fujian on June 15,2010 is analyzed.Results show that this precipitation process occurred because of the combined effect of upper trough moving eastward and southwesterly low-level jet.Rainfall occurred mainly on the right-front side of shear line and the left side of southwesterly low level jet exit region.The rainstorm is located in the wet area with stratification unstability（θse≥348 K）.Lower convergence and high level divergence are obvious.The analysis of radar echo shows that the heavy rain will happen（or be weak） if southwesterly low level jet strengthens（or weakens）,.For the five mesoscale rainmasses the relevant radar echoes show that there are cold advection invading in mid-and-upper layer,mesoscale convergence in mid-and-lower layer,mesoscale shear line,southwesterly low level jet and adverse wind region.The mesoscale convergence line in surface flow field is helpful to forecast the severe rainfall drop zone.

关 键 词：暴雨 西南急流 中尺度雨团 雷达回波特征 

分 类 号：P458.121.1[天文地球—大气科学及气象学]