【摘要】 利用NCEP1°×1°6h再分析资料和常规观测资料,对2008年9月22—27日四川盆地持续性暴雨过程进行了诊断分析。结果表明:副热带高压、东北冷涡、低空切变、青藏高原东部高空槽以及台风是影响此次暴雨过程的主要天气系统;来源于南海及孟加拉湾的低层偏南气流提供了稳定的水汽输送;暴雨前期850hPaθse场呈典型的"Ω"形分布;强烈的上升运动触发不稳定能量释放,有利于强降水天气的发生发展。更多还原

【Abstract】 The NCEP 1°×1° reanalysis data and conventional observation data are used to investigate the continual rainstorm event occurred in Sichuan Basin during 22—27 September 2008.The results indicated that the subtropical high,the northeastern cold vortex,the low-level shear,the upper trough in the east of Tibetan Plateau and typhoon were the major influence synoptic systems of this rainstorm.The low-level southerly flow which came from the South China Sea and the Bay of Bengal provided stable transportation of water-vapor.At the earlier stage of rainstorm,the θse field at 850 hPa showed the typical "Ω"mode,and the intense upward motion was favorable for the unstable energy to release and for the strong rainfall to occur and develop.更多还原