2011年6月23日沿淮强对流天气中尺度辐合特征模拟研究  

ANALYSIS OF MESOSCALE CONVERGENCE CHARACTERISTICS OF A SEVERE CONVECTIVE WEATHER PROCESS ON 23 JUNE 2011 ALONG THE HUAIHE RIVER

作　　者：吴丹娃[1,2] 潘益农[1] 吴林林[2] 严小静[2] 

机构地区：[1]南京大学大气科学学院/中尺度灾害性天气教育部重点实验室,南京210093 [2]安徽省气象局,安徽合肥230061

出　　处：《热带气象学报》2013年第4期672-680,共9页Journal of Tropical Meteorology

基　　金：国家自然科学基金项目(40875028;41172199)资助

摘　　要：利用常规地面、高空气象观测资料、安徽和江苏两省自动站观测资料、NCEP/NCAR再分析资料,对2011年6月23日江苏、安徽两省沿淮(简称沿淮)地区发生的一次强对流天气过程进行天气形势分析,并结合卫星、多普勒雷达资料进行综合分析,且运用中尺度数值模式WRF对本次过程进行数值模拟。结果表明:(1)西南地区鞍型场中激发的对流单体东移使得强对流天气能够增强和维持;(2)北方高空冷空气的下沉造成沿淮地区的雷雨大风;(3)本次强对流天气过程中的对流单体来源路径有3条:一是西南地区鞍型场激发的对流单体沿高空西南气流向东北方向输送到沿淮地区,二是源于南海产生于副高边缘的对流单体沿偏南气流向北输送到沿淮地区,三是西北方向高空槽前产生的对流单体沿西北气流向沿淮地区集中;(4)中低层切变线和地面辐合线对强对流系统起组织和加强作用。There occurred a severe convection process on 23 June 2011 along the Huaihe River. From 0800 BT 23 to 0800 BT 24 June 2011, the rainfall amount of 12 counties （or cities） within the 24 h exceeded 100 mm, and the measured rainfall amount in the system center of Mingguang reached 186 mm in 24 h. With multiple meteorological data, including conventional meteorological observations, automatic stations, 1 o~ 1 ~ NCEP/NCAR reanalysis data, MTSAT, doppler radar data, and the numerical simulations of WRF, we studied the weather patterns associated with it and conducted a comprehensive analysis and numerical simulation using the mesoscale model WRF. Results show as follows： （1） The convective cells moved from the southwestern saddle field, resulting in the enhancement and maintenance of the convective system. （2） The thunderstorm gale was caused by the descending of the upper-level cold air. （3） The convective cells came from three different directions. Firstly, the convective cells occurred in the southwestern saddle field, and then moved to the Huaihe river region along a meso-and low-level southwest current. Secondly, the convective cells occurred in the south current at the edge of subtropical high, and then moved to the Huaihe river region along the south current. Thirdly, the convective cells were triggered ahead of the upper trough and moved to the Huaihe river region along the northwest current. （4） Meso-and low-level shear line and surface meso-scale convergence line organized and intensified the convective cells.

关 键 词：强对流 数值模拟 鞍型场 中尺度分析 中尺度辐合线 

分 类 号：P445[天文地球—大气科学及气象学]