一次连续性冰雹天气过程的诊断分析

The Diagnostic Analysis of a Continuous Hail Process

对2000年秋季发生在甘肃庆阳的一次连续性冰雹天气过程进行了诊断分析。结果表明:这次冰雹天气过程是由于低层大气能量不断积累、低空切变线触发不稳定能量释放而产生的。冰雹出现在中低层对流不稳定和低层暖平流、高层冷平流以及低层辐合、高层辐散的上升运动区。冰雹落区与高低空温度平流和总温度平流的分布有着较好的对应关系。

In this paper, a continuous hail process, which occurred at Qingyang in Gansu province in fall in 2000, was diagnosed. The results showed that the process was happened by the reasons of atmosphere energy accumulating continuously and unstable energy releasing touched off by shear line in lower level. Hail occurred in the ascending motion area which had convective instability at middle-lower level, warm advection at lower level, cold advection at higher level, convergence at lower level and divergence at higher level. The hail area was correlated well to the distribution of temperature advection.