摘要
对2007年7月16—19日哈密暴雨天气过程的分析表明:这次暴雨是伊朗副高北伸,里咸海长脊,与乌拉尔山高压脊反气旋型接通,推动中亚低涡东移进入新疆,在哈密滞留造成的。深厚的低值系统从低层到中层都表现为强的辐合上升运动,为暴雨产生提供很强的动力条件,有利于暴雨所需不稳定能量的储存,低层风场辐合及中高层强西南气流不断将水汽输送至暴雨区,为暴雨提供充足的水汽,冷暖、干湿空气的水平、垂直交换等在暴雨中激发大量不稳定能量的释放加强了对流,这都是暴雨产生的直接有利条件,欧洲数值预报产品、T213物理量场和FY-2红外云图进行暴雨天气预报具有较好的指导意义。
The weather process of a rainstorm in Hami from 16th to 19th July in 2007 were analyzed ,and it is resulted that the northward Iran subtropical high and the high pressure ridge near the Ural Mountain drived depression in mid-Asia to Xinjiang and stayed in Hami area.Strong depression made intense convergence ascending from low layer to middle layer, which provided strong dynamic condition for rainstorm as it was vailahle for the deposit of instahle energy necessary for rainstorm.Convergence of wind field in low layer and strong south-west air flow made abundant vapour,and horizontal and vertical encharge between cold-warm air and dry-wet air exploded mass instability energy and intensified convection,all above could directly cause the rainstorm. Rainstorm would be well forecasted by ECMWF, physical field of T213 and infrared cloud imagery FY-2.
出处
《沙漠与绿洲气象》
2010年第1期36-40,共5页
Desert and Oasis Meteorology
关键词
暴雨
环流形势
低涡
物理量
rainstorm
circulation pattern
low vortex
physical quantity
