摘要
2009年7月8-9日发生在泰安的暴雨天气过程主要是在副高西进北抬、副高边缘西南暖湿气流与高空低槽东移南压相结合的大尺度环流下,由黄河北部的低层中尺度切变线和鲁中地区的小低涡以及低空西南急流共同作用造成的。低空西南急流为大暴雨的产生输送了充足的水汽,低涡加大了辐合上升运动和水汽辐合。850 hPa低空大气散度辐合中心正处于泰安,垂直速度强上升区也在鲁中地区,为暴雨产生提供了足够的动力条件,低层850 hPa假相当位温sθe>75℃的高能舌为这次暴雨提供了不稳定能量。
The rainstorm process occurred in Tai＇ an on July 8-9, 2009 is analyzed. In the large-scale circulation of the subtropical high north lift, the southwest warm and humid airflow in subtropical high edge combined upper-level low trough eastward shift, the interaction of mesoscale shear line in Yellow River northern, low vortieity in Luzhong region and low southwest jet causes the rainstorm process. The low southwest jet supplied the abundant vapor for the rainstorm; the low vorticity enhanced the convergence upward motion and moisture convergence. The divergence convergence center at 850 hPa is in Tai＇ an, and strong increasing region of vertical velocity is in Luzhong region, which provide sufficient dynamic conditions. The high energy tongue θse 〉 75 ℃ at 850 hPa provide instable energy.
出处
《气象与环境科学》
2009年第B09期221-223,共3页
Meteorological and Environmental Sciences
关键词
暴雨
副高
急流
低涡
rainstorm
subtropical high
jet
low vorticity
