广安一次局地大暴雨过程的中尺度特征分析  

Mesoscale Characteristics Analysis of a Local Heavy Rainstorm in Guang’an

作　　者：陈怡蓓 蹇冬梅 邱岚 CHEN Yibei;JIAN Dongmei;QIU Lan(Guang’an Meteorological Bureau,Guang’an 638000,China;Dazhou Meteorological Bureau,Dazhou 638500,China)

机构地区：[1]四川省广安市气象局,广安638000 [2]四川省达州市气象局,达州635000

出　　处：《高原山地气象研究》2022年第S01期66-69,共4页Plateau and Mountain Meteorology Research

摘　　要：利用常规气象观测资料和加密地面自动站资料,分析了2020年6月17日广安市局地大暴雨过程的中尺度对流条件及形成原因。结果表明:此次暴雨过程发生在副高西北侧、槽前上下一致的西南气流里;充沛的水汽、暖平流与中高层南下冷空气的叠加影响、高不稳定能量等因素是造成此次对流性降水发展和维持的主要原因;而显著的增暖增湿过程使广安中东部对流条件好于周边地区,加上地形和地面风场的共同影响加强了触发抬升条件,导致出现局地大暴雨天气过程。Based on conventional meteorological observation data and encrypted ground automatic station data,the mesoscale con-vective conditions and causes of local heavy rain in Guang'an City on 17 June 2020 were analyzed.The results show that the rainstorm oc-curred in the southwest airflow in the northwest side of the subtropical high and in the front of the trough.The main reasons for the devel-opment and maintenance of convective precipitation are abundant water vapor,the superposition of warm advection and middle-high level southward cold air,and high unstable energy.The obvious warming and humidifying process makes the convective conditions in the cent-ral and eastern part of Guang’an better than those in the surrounding areas.In addition,the combined influence of topography and sur-face wind field strengthens the triggering uplift conditions,resulting in the occurrence of local heavy rain weather process.

关 键 词：局地大暴雨 中尺度特征 边界层风场 地形 

分 类 号：P458.2[天文地球—大气科学及气象学]