CAJ | 학술논문

利用常规观测资料、卫星、雷达资料以及NCEP再分析资料、LAPS局地分析资料，对2011年6月湖南两次暴雨过程的中尺度特征进行对比分析。结果表明：两次过程均属于湖南盛夏低涡冷槽型暴雨过程，但中尺度特征、降水性质和环境条件有差异。“6．09暴雨”由一个及地的β中尺度低涡产生，过程期间低涡稳定少动，卫星云图上表现为一个发展强烈的中尺度对流云团，雷达回波前期为窄型带状积云降水回波，后期逐渐转变为积层混合云降水回波；而“6．13暴雨”影响系统为中尺度切变线，切变线维持时间长，移动缓慢，卫星云图上是一条长时间维持的对流云带，雷达回波为积层混合云降水回波。水汽输送通道的建立和中低层水汽的大量集中为中尺度对流系统的发展提供了有利的环境条件，暴雨发生在锋前高温高湿的不稳定层结和强上升运动区域中，锋区的动力强迫上升运动加强了低层能量和水汽的往上输送。两次过程中尺度对流系统均具有深厚的垂直环流结构，“6．09暴雨”湘东北特大暴雨区是一支近乎垂直的深厚上升气流，南北两侧有明显的补偿下沉气流，而“6．13暴雨”湘中暴雨区垂直上升运动是倾斜向上的，只有南侧存在补偿下沉气流。
이용상규관측자료、위성、뢰체자료이급NCEP재분석자료、LAPS국지분석자료，대2011년6월호남량차폭우과정적중척도특정진행대비분석。결과표명：량차과정균속우호남성하저와랭조형폭우과정，단중척도특정、강수성질화배경조건유차이。“6．09폭우”유일개급지적β중척도저와산생，과정기간저와은정소동，위성운도상표현위일개발전강렬적중척도대류운단，뢰체회파전기위착형대상적운강수회파，후기축점전변위적층혼합운강수회파；이“6．13폭우”영향계통위중척도절변선，절변선유지시간장，이동완만，위성운도상시일조장시간유지적대류운대，뢰체회파위적층혼합운강수회파。수기수송통도적건립화중저층수기적대량집중위중척도대류계통적발전제공료유리적배경조건，폭우발생재봉전고온고습적불은정층결화강상승운동구역중，봉구적동력강박상승운동가강료저층능량화수기적왕상수송。량차과정중척도대류계통균구유심후적수직배류결구，“6．09폭우”상동북특대폭우구시일지근호수직적심후상승기류，남북량측유명현적보상하침기류，이“6．13폭우”상중폭우구수직상승운동시경사향상적，지유남측존재보상하침기류。
Based on the routine observational data,FY2C TBB data,radar data,NCEP reanalysis data and LAPS analysis data,a comparative analysis on mesoscale characteristics of two torrential rain processes in Hunan Province in June 2011 was analyzed.The results show that:The two processes belong to the type of low-vortex and cold-trough rainstorm,but their mesoscale characteristics,precipitation nature and envi-ronmental conditions are different.The rainstorm on 9 June 2011 is generated by a meso-βscale low vor-tex,which is stable and immobile during the process.The satellite image manifests a mesoscale convective cloud cluster which develops severely,and the radar echoes are convective precipitation echoes in the earli-er stage and transform to convective-stratiform mixed clouds echoes in the later stage.In comparison,the rainstorm on 13 June 2011 is mainly produced by mesoscale convective shear lines which maintain for a long time and move slowly.The satellite images show it a convective cloud band that exits for a long time,and the radar echoes are convective-stratiform mixed clouds echoes.The establishment of vapour transfer channels and strong convergence of water vapor in the middle-and-low troposphere provide favorable condi-tions for the mesoscale convective system.The two severe rainstorms both occur in the unstable stratifica-tions with high temperature and humidity and strong ascending motions.The ascending movements caused by the dynamic forcing in the frontal zone enhance upward transfer of energy and water vapor from low levels.The obvious compensation descending airflows appear on the north and south sides of the deep ver-tical motion in the first process,but in the second process,the ascending motion is inclined,and the com-pensation descending airflows only appear on the south side.