【作者】 张晶晶； 梅婷； 马中元；

【Author】 Zhang Jingjing;Mei Ting;Ma Zhongyuan;Nanjing Nanjing University of Information Science &Technology;Jiujiang Meteorological Observatory;Jiangxi Province Meteorological Science Institute;

【机构】 南京信息工程大学； 九江市气象台； 江西省气象科学研究所；

【摘要】 利用地面加密观测资料、自动站雨量资料、FY-2C卫星资料和多普勒雷达探测等资料,对2010年6月江西致洪大暴雨过程进行了中尺度分析。结果表明:大暴雨是中尺度辐合线、中尺度低压和中-β、中-γ、中-α尺度、中对流云团共同作用引发的,高层辐散先于中低层辐合的抽吸机制,上干冷、下暖湿不稳定层结,南海丰沛的水汽输送是大暴雨形成的物理条件。中尺度对流系统具有深厚的垂直环流结构,增强低层水汽辐合,锋区的动力强迫上升运动加强低层能量和水汽的往上输送,高层辐散气流增强MCS的发展。暴雨区地形的作用增强了锋面强迫上升运动。更多还原

【Abstract】 A mesoscale analysis for the flash flood process on june 2010 in Jiang Xi Province is performed with the surface densified observation, rainfall data of automatic precipitation stations, FY-2C satellite, Doppler-Radar data.. The results indicate that the heavy rain occurred under the effect of mesoscale convergence line, mesoscale low and meso-β meso-γ meso-α convective cloud clusters together. Suction effect with the divergence in the high level emerging earlier than that of convergence in the mid- and low-level, unstable stratification of the dry and cold air in the high and warm and humid air in the low profile and rich water vapor transport from South China Sea are the environmental conditions for the occurrence of heavy rain. Mesoscale systems which are corresponding with the activity of rain clusters can be clearly seen from the stream field after filtering. MCS had a deep vertical circulation structure with the vortex-cylinder and the water vapor and energy convergence was strengthened;at the same time,the ascending movement caused by dynamic forcing at the frontal zone enhanced upward energy and water vapor transferring from lower levels, and thus the divergence flow was reinforced at upper levels, which all contributed to enhancement of MCS development and generated torrential rainfall; the trumpet-shaped terrain uplifting the stream and reinforced the ascending movement forced by the cold front at the rainfall center..更多还原