台风“泰利”过后汕尾特大暴雨过程的成因分析  

Analysis of the Causation of an Exceptionally Heavy Rain in the Wake of Typhoon Talim in Shanwei

作　　者：王小粤 吴道远 李泳泽 林晓青 刘炳锋 

机构地区：[1]汕尾市气象台,广东汕尾516600

出　　处：《广东气象》2015年第5期19-22,共4页Guangdong Meteorology

摘　　要：利用常规气象资料、中尺度自动站观测资料、NCEP 1°×1°分辨率再分析资料以及多普勒雷达资料等,对2012年6月21—23日汕尾地区连续性强降水过程进行了分析。结果表明:低层辐合、高层辐散、中尺度切变以及中层气旋性环流的相互配合触发了该次特大暴雨过程;前期不稳定能量的积累为强降水的发生提供了十分有利的条件;垂直上升运动有利于水汽的输送,低层辐合、高层辐散的形势场配置有利于上升运动的维持和水汽的抬升;地面中尺度辐合线的移动演变对强降水的持续时间和降水落区有较好的指示作用;中低层垂直风切变的增大、速度场的辐合有利于强单体风暴的形成和发展;南海夏季风随台风活动的演变对于预报暴雨的发生时间和强度有较大的指示作用。Using data of conventional observation,mesoscale automatic weather stations,NCEP 1° × 1°reanalysis at the resolution of 1° × 1° and Doppler radars,we studied the process of a sustained,intense rain June 21- 23,2012 in the area of Shanwei. The result is shown as follows. It was the joint action between low-level convergence,upper-level divergence,mesoscale shear and mid- level cyclonic circulation that triggered this exceptionally heavy rain. In the time leading up to it,instability energy accumulated to provide very favorable conditions. Vertical ascending motion helped transport water vapor and a pattern of low-level convergence versus upper- level divergence was favorable for the maintenance of ascending motion and the uplifting of water vapor. The movement and evolution of a surface mesoscale convergence line was indicative of the duration and falling area of this rain. The enhancement of vertical wind shear between the middle and lower level and the convergence of the velocity field helped form and develop a storm with intense cells. The evolution of the South China Sea summer monsoon with typhoon activity is an indicator in forecasting the occurrence time and intensity of the heavy rain.

关 键 词：天气学 暴雨 夏季风 物理诊断 汕尾 

分 类 号：P458.121.1[天文地球—大气科学及气象学]