“20110714”沈阳短时强降水多普勒雷达回波特征  

Doppler weather radar echo characteristics in a short-term heavy rain on July 14,2011 in Shenyang

作　　者：李大为[1] 梁红[1] 贾冬婵[2] 夏传栋[1] 赵柳扬 孟鹏[1] 

机构地区：[1]沈阳市气象局,辽宁沈阳110168 [2]辽宁省气象科技服务中心,辽宁沈阳110016

出　　处：《气象与环境学报》2013年第2期75-80,共6页Journal of Meteorology and Environment

基　　金：沈阳市科技专项资金(F10-082-3-00)资助

摘　　要：为了更好地预报、预警超级风暴单体引起的短时强降水,利用沈阳棋盘山多普勒雷达、营口多普勒雷达和自动站及地面、高空等气象资料,对2011年7月14日沈阳强降水超级单体风暴进行分析。结果表明:地面辐合线和切变线提前于降水2 h产生,而且地面辐合线和切变线的位置与风暴的生成位置重合。强对流风暴具有超级单体风暴特征,风暴出现弓形回波;速度图上存在"v"型入流缺口,相应速度场上出现中气旋,营口雷达基本反射率最大值达到61 dBz,反射率因子垂直剖面出现弱回波区和回波悬垂。当雷达回波发现中气旋、并预计中气旋能维持1 h左右或者雷达回波发现弓形回波、沈阳棋盘山雷达基本反射率强度超过45 dBz时,可发布短时暴雨或雷雨大风等强对流气象灾害预警。Based on the Doppler radar data from Shenyang and Yingkou and surface and upper meteorological data from automatic weather stations,a supercell storm process on July 14,2011 in Shenyang was analyzed in order to forecast accurately the short-time heavy rain caused by a superceU storm. The results show that the formation of ground convergence line and shear line are about 2 hours ahead of that of precipitation, and both locations are con- sistent with the storm location. The heavy convective storm is of feature of superceU storm,and it appears bow ech- o. An inflow gap with a ＂V＂ shape appears on the speed chart, so is a mesocyclone in the corresponding speed field. The maximum basic reflectivity rate in Yinkou reaches 61 dBz,and there are weak echo area and echo over- hang on the vertical profile of reflectivity factor. The severe convective weather disaster warning about short-term rain and thunderstorms can be issued when the mescocyclone is found in the radar echo and the cyclone could maintain about 1 hour or it appears the bow echo, and radar base reflectivity intensity in Shenyang is more than 45 dBz.

关 键 词：超级风暴单体 中气旋 弓形回波 短时强降水 垂直风切变 回波悬垂 

分 类 号：P458.121[天文地球—大气科学及气象学]