低空急流在四川“9.18”大暴雨中的触发作用  

The Trigger Action of Low-level Jet in a Heavy Rain of Sichuan Province

作　　者：陈静[1] 李川[2] 谌贵珣[1] 

机构地区：[1]四川省气象台,成都610072 [2]成都高原气象研究所

出　　处：《气象》2002年第8期24-29,共6页Meteorological Monthly

摘　　要：利用 2 0 0 1年 9月 17～ 2 1日T10 6客观分析资料 ,较详细地分析了“9 18”四川盆地西北部大暴雨过程的物理条件和可能机制 ,发现向北推进的低空偏南风急流促使川西北形成有利于暴雨的热力、水汽和动力条件。低空急流最大风速出口辐合上升区与地形抬升作用共同造成盆地西北强烈的垂直上升运动 ,激发对流云团强烈发展 ,是本次暴雨的触发条件。局地地形的强烈抬升作用增强了上升运动和水汽辐合 。Based on the T106 objective analysis data obtained from 17 to 21 September of 2001,the physical conditions and possible mechanism of Sichuan ″9.18″ torrential rain are analyzed. The results reveal that northward low level south east jet would cause favorable thermodynamic, moisture and dynamic conditions for the heavy rainfall in the northwestern Sichuan. The strong upward vertical movement, resulted from the convergence ascending of low level south east jet exit region and the local topographic forcing, stimulated strong convective clouds. The heavy rain was amplified to a great extent by local topographic forcing, and the convergence of low level wet air.

关 键 词：暴雨 低空急流 触发机制 四川盆地 物理条件 热力条件 水汽条件 动力条件 

分 类 号：P458.121.1[天文地球—大气科学及气象学]