2006—2016年池州地区短时强降水天气类型特征分析  

Analysis on Characteristics of Short-Duration Heavy Precipitation in Chizhou Area during 2006-2016

作　　者：吴照宪 胡建春 张明明 Wu Zhaoxian;Hu Jianchun;Zhang Mingming(Anhui Provincial Meteorological Bureau,Chizhou 247000,China)

机构地区：[1]池州市气象局,安徽池州247000

出　　处：《气象与减灾研究》2018年第2期112-118,共7页Meteorology and Disaster Reduction Research

基　　金：安徽省气象局预报员专项(编号:KY201808)

摘　　要：利用国家基本站、区域站资料,分析了2006—2016年池州市短时强降水时空分布特征,建立3种天气学概念模型,并总结了短时强降水的中尺度系统、相关物理量和雷达回波的一般特征。结果表明:池州市短时强降水主要发生在汛期(5—8月),其中7月最活跃,其次分别是6、8月。强度≥20 mm/h和≥30 mm/h的短时强降水日变化呈现双峰型特征,强度≥50 mm/h的短时强降水则呈现单峰型特征。东至县中南部是短时强降水的易发区域,其次是贵池南部山区和九华山东、西两侧区域。池州市短时强降水天气类型可分为副热带高压边缘型、西北气流型和台风型,其中副热带高压边缘型是短时强降水的易发天气类型。中小尺度天气系统在不同天气类型中的作用存在差异,但相关物理量差异不明显。副热带高压边缘型、台风型强降水过程中雷达反射率因子多表现低质心结构特征,西北气流型呈现高质心结构特征。Based on the 2006-2016 meteorological data of Chizhou regional station and national basic station,the temporal and spatial distribution characteristics of short-duration heavy rainfall were analyzed and three conceptual models were established.The corresponding general characteristics of mesoscale system and its physical quantity and radar echo were summarized.The results showed that the short-duration heavy precipitation in Chizhou was mainly occurred in flood season,most happened in July,followed by June and August.The daily variation of short-duration strong precipitation presented bimodal characteristics as the precipitation strength more than 20 mm/h and 30 mm/h,while presented a single-peak as the precipitation strength more than50 mm/h.The short-duration heavy precipitation mainly occurred in the county of Dongzhi.The short-duration heavy rainfall can be divided into subtropical high edge type,northwest airflow type and typhoon type,and the subtropical high edge type was prone to causing short-duration heavy precipitation;The small and mesoscale system had different influences on different weather types,while the corresponding physical differences were not significant;The radar＇s reflectivity factors of subtropical high edge and typhoon types were characterized by low centroid structure,but the northwest airflow pattern presented high centroid structure.

关 键 词：短时强降水 时空分布 天气概念模型 中尺度系统 

分 类 号：P458[天文地球—大气科学及气象学]