辽宁黑山突发性局地特大暴雨中尺度对流条件和特征  

Mesoscale convective conditions of abrupt and local rainstorm and its characteristics at Heishan of Liaoning province

作　　者：才奎志 蒋大凯 杨磊 于增华 孙晓巍[2] 陈宇 谭世君 

机构地区：[1]辽宁省气象灾害监测预警中心,辽宁沈阳110166 [2]辽宁省气象台,辽宁沈阳110166 [3]辽宁省气象局,辽宁沈阳110001

出　　处：《气象与环境学报》2014年第6期1-7,共7页Journal of Meteorology and Environment

基　　金：中国气象局预报员专项"基于SWAN系统的定量降水技术研究与应用"(CMAYBY2013-016);辽宁省气象局气象科研项目"不同类别强对流天气的探空T-logp图分析技术"(201407)共同资助

摘　　要：利用常规和加密自动气象站观测资料、卫星和雷达探测资料及NCEP再分析资料(1°×1°,6 h),对2013年8月15—16日辽宁黑山地区特大暴雨的中尺度对流条件和对流系统特征进行分析。结果表明:此次强降水由中—β尺度系统引起,短时大暴雨发生在能量舌边缘,地面偏东风和地形强迫抬升作用造成对流单体沿山脉东侧生成、发展和移动,最终导致持续对流性强降雨。东北低压冷锋前激发的中尺度切变和涡旋触发了局地大暴雨。黑山地区上游有两个对流单体生成,向东移动合并影响该地区,移动方向前侧的斜升气流和低质心回波提高了降水效率。Based on data from conventional and automatic weather stations,satellite and radar,and the NCEP rean-alysis data （1 °×1 °,6 h）,the mesoscale convective conditions and convective system characteristics of an extraor-dinary rainstorm process on August 15-16,2013 at Heishan of Liaoning province were analyzed.The results show that the severe precipitation process is caused by mesoscale-βconvectional systems.The short-term torrential rain area occurs at the edge of energy tongue.Surface eastward wind and topographic force are dominant factors that causes generation,development and movement of convection cells along the east side of mountain,which lead to the continuous and convectional precipitation.The mesoscale wind shear and vortex motivated by the northeast low-pressure cold front trigger the local torrential rain.Two separate convective cells generate in upper reaches of heavy rain areas,and merge together and then influence Heishan County.The oblique ascension airflow in front of echo moving direction and low heart echo both enhance precipitation efficiency.

关 键 词：能量舌 中尺度涡旋 地形强迫 斜升气流 

分 类 号：P458.2[天文地球—大气科学及气象学]