摘要
利用常规气象资料和地面中尺度资料,从天气形势、物理量场和中尺度自动站风场,以及根据探空资料计算的对流有效位能等,研究了2007年8月3日发生在上海地区的一次强风暴天气。结果表明:该次强风暴天气发生在高空槽前、低空切变线和地面弱冷锋影响的有利环流背景下,大气层结处于位势不稳定状态,低层假相当位温的高能舌内和能量锋区,对流有效位能高能中心附近区域;散度场表现为低层辐合、中层辐散,中低层垂直速度为上升区;低空长江流域、江淮地区维持一条强水汽输送带和水汽辐合区;地面到200 hPa风的垂直切变大;地面中尺度辐合线触发对流发展。
A severe storm weather process in Shanghai area on Aug 3.2007 was investigated by analyzing synoptic situation,physical parameters,mesoscale wind data from automatic weather stations,etc.The result showed that it occurred under the advantageous environmental background situation,such as infront of an upper-level trough,with a low-level shear line and a weak cold front,in a tongue of highenergy and energy frontal zone ofθ_(se),and in the center of high CAPE.The stratification of atmosphere was potentially unstable.There was a belt of large water vapor flux and convergence in the Yangtze River Basin and Jianghuai region.There existed a severe vertical wind shear from the ground surface to 150 hPa.The ground mesoscale convergence line triggered the strong convection.
出处
《大气科学研究与应用》
2008年第2期27-34,共8页
Atmospheric Science Research and Application
