【摘要】 利用常规观测资料、自动站观测资料和NCEP 1°×1°再分析资料、雷达探测等资料对2007年7月11日山东中西部发生的一次飑线过程进行了综合诊断分析。结果表明:飑线发生在高空低涡后部横槽前上干冷下暖湿的不稳定层结中,高空急流和地面切变线对不稳定能量的释放有触发作用;飑线是在低空增温增湿及对流层中层干侵入的作用下形成的,并在强风速垂直切变条件下发展成熟,边界层弱的水汽输送和能量积聚是这次过程的能量来源。更多还原

【Abstract】 Based on conventional data,AMS(Automatic Meteorological Station) data,NCEP reanalysis data of 1°×1° with a 6 h interval,and radar echo data,a squall line weather event on 11 June 2007 is analyzed comprehensively.The weather background,radar echoes,meteorological element fields are diagnosed.The results show that the squall line occurred under an unstable stratification,in which it was dry and cold at the upper level,wet and warm at the lower troposphere;its triggering mechanisms include the upper-troposphere jet,ground shear,vertical wind shear,and dry air intrusion in the middle troposphere;its energy sources include the weak ABL water vapor transportation and energy accumulation.更多还原