摘要
利用中尺度数值模式对2006年4月28日发生在山东省境内的一次飑线天气过程进行了数值模拟,并结合常规观测、自动气象站、卫星云图、多普勒天气雷达等资料对此次过程进行诊断分析。结果表明:飑线是高空西风槽、低空切变线和地面低压槽共同作用产生的。在高层干冷、低层暖湿的不稳定条件下,地面低压槽内诱生出中尺度对流系统MCS,在有利的水汽、热力、动力条件下使得MCS中的雷暴群发展为飑线。
The squall line,which happened in Shandong on 28 April 2006,is diagnosed by using the simulation results of mesoscale numerical model and conventional observation,automatic meteorological stations, satellite cloud image and Doppler radar data.The results show that the squall line occurs under the effects of upper westerly trough,lower shear line and surface trough.Under the condition of the unstable stratification of the dry and cold in the upper level and warm and humid in the lower level,mesoscale convective system(MCS) occurs in the surface trough.The thunderstorm complex in MCS evolves into a squall line under the local advantaged dynamic,thermal,and water vapor conditions.
出处
《大气科学研究与应用》
2007年第1期69-77,共6页
Atmospheric Science Research and Application
