摘要
利用NCEP的1,°×1,°格点资料,计算北京和天津地区平均垂直螺旋度;配合常规观测资料及多普勒雷达资料,对2012年7月21—22日京津特大暴雨进行诊断分析,结果表明:在高空槽与低空气旋性涡旋配合的形势下,平均垂直螺旋度对特大暴雨的发生发展有很好的诊断作用。
The NCEP 1°×1° grid data was used in the calculation of the average vertical helicity in the Beijing-Tianjin region; based on diagnostic analysis on both conventional observation data and Doppler radar data, a diagnostic analysis on an extraordinary rainstorm took place in the Beijing-Tianjin region from July 21-22, 2012 was performed.The results showed that, with the coordination of upper-level trough and lower-level cyclonic vortex, the average vertical helicity plays an important role in the diagnosis of the development and progressing of an extraordinary rainstorm.
出处
《天津科技》
2014年第6期61-64,共4页
Tianjin Science & Technology
关键词
垂直螺旋度
特大暴雨
诊断分析
vertical helicity
extraordinary storm
diagnostic analysis
