【作者】 阙志萍； 吴凡； 吴媛； 马中元；

【Author】 Que Zhiping;Wu Fan;Bi Chen;Wu Yuan;Ma Zhongyuan;Meteorological Service Center of Jiangxi;Jiangxi Provincial Meteorological Research Institute;

【机构】 江西省气象服务中心； 江西省气象科学研究所；

【摘要】 利用地面、高空等常规观测资料,结合雷达、自动站等非常规资料,以及TBB和NCEP1.0°×1.0°的再分析资料,采用统计对比等分析方法对2015年4月2日江西北部强天气过程进行分析研究,结果表明:此次过程是一次强飑线系统背景下产生的,造成江西北部强对流天气的并不是飑线系统本身,而是由飑线系统前端不断生成的中小尺度对流系统。中高纬阻高形势、中纬度500h Pa低槽、中低层切变以及低空西南急流的有利配置为此次强对流过程的产生提供了有利的环境条件。强对流发生前,近地面强烈增温、对流层中低层强对流不稳定层结、强垂直风切变,以及丰富的水汽条件为强对流风暴的发生发展提供了良好的潜势条件。地面温度锋区为不稳定能量的释放和中尺度对流系统的发生发展提供了触发条件。更多还原

【Abstract】 Based on various data including conventional observation data,Doppler-Radar data, observations from automatic weather stations, TBB data and reanalysis data from NCEP, the cause analysis of a severe convective weather process over the north of Jiangxi on 2 April 2015 was performed. The results indicated that the convective process occurred at the background of a heavy squall line. However,the severe convective weather was not caused by the squall line itself, but by the mesoscale and microscale convective systems generated continuously in front of the squall line. The blocking high at high latitude, the trough of 500 h Pa at mid-latitude,the shear lines in middle and lower troposphere and the southwest jet in low-level provided favorable environmental conditions for the process. Before the process,intense warming near the ground, instable convection stratification in middle and lower troposphere, strong vertical wind shear and abundant water vapor near the ground provided good potential conditions for the occurrence and development of the severe convective storm. Ground temperature front provided trigger conditions for the release of the unstable energy and the occurrence and development of the mesoscale convective systems.更多还原