摘要
2014年7月31日至8月4日,包头地区出现了一次明显降水过程,降水前期以强对流天气带来的短时强降水为主,降水后期为稳定性小量级降水。分析表明:暖式切变配合有利的水汽、动力及不稳定条件产生了第一阶段的对流性强降水天气;第二阶段降水由冷式切变触发,由于切变移动速度慢,水汽输送条件好,持续时间较长,但降水发生在不稳定能量释放之后,动力抬升条件、水汽辐合条件、层结条件都有明显地减弱,无对流产生且降水量级较小。
There was a obviously precipitation process from 31 July to 4 August in 2014 in Baotou. Earlier stage of the precipitation was the short-time heavy precipitation which brought by the convective weather, and the late stage was the small stable rainfall. The results showed that the warm shear with favorable water vapor, dynamic and unstable conditions produced a convective heavy precipi-tation process in the first phase. The second phase precipitation was triggered by cold shear, since the cold shear moving slowly, water vapor transfer condition well, duration time longed, but the precipitation occurs after the release of unstable energy, the dynamic lift-ing condition, water vapor convergence condition, stratification condition had weakened obviously, no convection and the rainfall grade was small.
出处
《内蒙古气象》
2015年第6期3-6,共4页
Meteorology Journal of Inner Mongolia
关键词
暴雨
切变线
强对流天气
不稳定能量
rainstorm
shear line
convective weather
unstable energy
