浙北地区春季一次弓形回波造成的雷暴大风天气过程成因分析  

Analysis on the Causes of a Thunderstorms Gales Weather Process by Bow Echo in Spring in Northern Zhejiang Province

作　　者：宋刘明 田德宝 吴建青 张珊珊 葛非凡 Song Liuming;Tian Debao;Wu Jianqing;Zhang Shanshan;Ge Feifan(Jiaxing Meteorological Bureau of Zhejiang,Jiaxing 314050,Zhejiang,China;Tongxiang Meteorological Bureau of Zhejiang,Tongxiang 314599,Zhejiang,China)

机构地区：[1]浙江省嘉兴市气象局,浙江嘉兴314050 [2]浙江省桐乡市气象局,浙江桐乡314599

出　　处：《科技通报》2023年第8期7-13,共7页Bulletin of Science and Technology

摘　　要：本文利用常规气象观测资料、NCEP/NCAR(1°×1°)再分析资料及多普勒雷达数据对浙江北部地区2022年4月25日的一次强对流天气过程进行分析。结果表明:200 hPa高空急流、500 hPa槽、700 hPa切变线、地面热低压是此次天气过程的主要影响系统,强对流天气自西南向东北移动,先后影响杭州、湖州、嘉兴等浙江北部地区,影响范围广、持续时间较长。此次强对流天气过程发生在高空槽前、低层切变线南侧的强盛西南暖湿气流中,是由地面低压倒槽内的中尺度辐合线触发。由于湿层浅薄,水汽条件一般,此次强对流天气过程以雷暴大风天气为主,局地伴随短时暴雨和小冰雹。从雷达数据分析,强对流天气东移发展过程中可见弓形回波、速度模糊等雷暴大风天气特征,强对流天气伴随回波带的移出而结束。In order to analysis of a severe convection weather process in northern Zhejiang Province,April 25,2022,based on the conventional observation data and NCEP/NCAR(1°×1°)reanalysis data and doppler radar,the results show that:The upper-level jet stream of 200 hPa,trough of 500 hPa,shear line of 700 hPa and thermal low of surface are the main influencing systems of this weather process.Severe convective weather moves from southwest to northeast,successively affecting Hangzhou,Jinhua,Shaoxing,Ningbo,Jiaxing and other central and northern areas of Zhejiang Province,with wide range of influence and long duration.Severe convective weather process occurred in moist air in front of the upper trough and south of the lower shear line of the strong southwest warm jet stream,which was triggered by the mesoscale convergence line in the trough of low pressure at surface.The mainly severe convection weather process was thunderstorms gales because of the shallow wet layer and the general water vapor condition,accompanied by short time rainstorm and small hail locally.According to analysis radar data,during the eastward development of severe convective weather,the characteristics of thunderstorms such as bow echo,velocity ambiguity,the severe convective weather ends with the echo belt moving out.

关 键 词：雷暴大风 高空急流 中尺度辐合线 速度模糊 浙北地区 

分 类 号：P429[天文地球—大气科学及气象学]