摘要
采用数值模拟方法对2007年6月14日滇东北一次飑线过程进行诊断分析。结果表明:对流层低层中尺度涡旋是飑线形成和维持的主要原因。冷空气入侵导致对流层中层形成较强的南北风切变,南北气流的汇合造成大气上冷下暖的不稳定结构,为强对流天气的发生发展提供了较好的动力和热力条件。飑线前沿存在强烈的气流辐散辐合,从而导致剧烈的局地上升和下沉运动,并形成局地垂直环流,是冰雹和大风产生的直接原因。飑线前沿气旋性和反气旋性涡度发展旺盛,且强烈发展的正负涡度区和气流的垂直运动相配合。
Used numerical simulation methods to diagnose and analyze a squall line process in northeastern Yunnan on June 14,2007.The results showed that mesoscale eddies in the lower troposphere were the main cause of the formation and maintenance of squall lines.The invasion of cold air led to the formation of strong north-south wind shear in the middle troposphere,and the convergence of north-south airflow resulted in the unstable structure of cold upper atmosphere and warm lower atmosphere,providing better dynamic and thermal conditions for the occurrence and development of severe convective weather.There was a strong divergence and convergence of airflow at the front of the squall line,leading to intense local upward and downward movements,and the formation of local vertical circulation,which was the direct cause of hail and strong winds.The cyclonic and anticyclone vorticity in the front of the squall line develop vigorously,and the strongly developed positive and negative vorticity areas match with the vertical movement of the air flow.
作者
马红
胡勇
余加贵
马勋豪
Ma Hong(Meteorological Bureau of Zhaotong City,Zhaotong,Yunnan 657000)
出处
《农业灾害研究》
2023年第9期106-108,共3页
Journal of Agricultural Catastrophology
基金
云南省气象局科研项目“昭通强对流天气形成机理及预报预警技术研究”(YZ202235)。
关键词
飑线
中尺度涡旋
垂直环流
数值模拟
Squall line
Mesoscale eddies
Vertical circulation
Numerical simulation
