CAJ | 학술논문

利用常规气象观测资料、NCEP资料、卫星、雷达和地面加密观测等资料,对2008年5月27-28日江西北部一次冷锋南侧(冷锋前)对流性暴雨过程进行天气动力学诊断分析和中尺度分析.结果表明:(1)对流性暴雨出现在冷锋前的主要原因是:各层槽线位置近于垂直,锋面陡峭,并出现前倾槽结构;冷锋前低层暖湿气流异常强盛,下暖湿上干冷使对流不稳定能量增强;当冷锋移近、气旋波发展东移和低空急流加强,触发了冷锋前对流不稳定能量释放.(2)本次暴雨具有明显中小尺度特征,共有4个β中尺度对流系统沿地面冷锋南侧发展东移,850 hPa的中尺度辐合线、地面中低压和中尺度辐合线、云顶亮温低值区、强回波区及雷达速度图上逆风区等均揭示中小尺度扰动系统存在,且中小尺度扰动系统与暴雨雨团对应很好.
이용상규기상관측자료、NCEP자료、위성、뢰체화지면가밀관측등자료,대2008년5월27-28일강서북부일차랭봉남측(랭봉전)대류성폭우과정진행천기동역학진단분석화중척도분석.결과표명:(1)대류성폭우출현재랭봉전적주요원인시:각층조선위치근우수직,봉면두초,병출현전경조결구;랭봉전저층난습기류이상강성,하난습상간랭사대류불은정능량증강;당랭봉이근、기선파발전동이화저공급류가강,촉발료랭봉전대류불은정능량석방.(2)본차폭우구유명현중소척도특정,공유4개β중척도대류계통연지면랭봉남측발전동이,850 hPa적중척도복합선、지면중저압화중척도복합선、운정량온저치구、강회파구급뢰체속도도상역풍구등균게시중소척도우동계통존재,차중소척도우동계통여폭우우단대응흔호.
Based on the routine data, NCEP data, satellite images, radar data, and the densified observations, a dynamical diagnosis of the convection torrential rain in south of cold front on 28 May 2008 in the northern part of Jingxi Province is made. The results show that (1) the convection torrential rain south of cold front was due to the several main reasons, such as, all nearly vertical troughs at various levels, precipitous front surfaces, forwarded-tilting trough structure, extremely strong lower warm and wet air flows ahead of the cold front, greatly increased unstable energy of the convection formed by warm, wet below and dry, cold above convections, and the low-level southwest jet stream strengthening when the cold front moving closely and cyclone wave moving east. All of these factors resulted in the unstable energy release from the convection. (2) This torrential rain showed the characteristics on obvious meso and small scales that had four meso-β scale convection systems moving to the east along the ground cold front. The ground mesoscale cyclone, the mesoscale convergence line,the strong echo area,the head wind zone, and the 850hPa mesoscale convergence line, all demonstrated the presence of the mesoscale perturbation. Furthermore, mesoscale perturbation was well correlated to the convective rain cluster.