2012年8月四川盆地东部一次持续性暴雨过程的中尺度特征分析  

Mesoscale Characteristics Systems during the Continuous Heavy Rainfall in Eastern Sichuan in August,2012

作　　者：周春花[1] 张驹[2] 

机构地区：[1]四川省气象台,成都610072 [2]四川省气象局科技与预报处,成都610072

出　　处：《高原山地气象研究》2013年第3期31-36,共6页Plateau and Mountain Meteorology Research

摘　　要：针对2012年8月30日～9月1日四川盆地东部的大暴雨个例，采用Barnes带通滤波和物理量诊断方法，对暴雨过程的中尺度活动特征进行分析，结果得出：700hPa的中尺度辐合系统与强降水位置对应较好，且中尺度低涡引发强降雨的强度（雨强、范围）要大于中尺度辐合线（辐合中心）；盆地内大气的辐合运功主要位于850hPa，造成此次暴雨的中尺度系统由浅薄逐渐转为深厚，且在整个暴雨过程中都维持着强的辐合辐散运动；暴雨天气过程中非平衡状态呈现出逐渐加强到逐渐减弱的演变规律，持续的非平衡振动激发低层辐合，高层辐散增长，从而形成强烈的上升运动。By analysing the feature of the mesoscale activities of the storm happened in eastern part of Sichuan basin dur- ing August 30th, 2012 to September 1st, 2012, with the mesurement of Barnes bandpass filter and physical quantity method, the conclusion is the mesoscale auxiliary system matches well with the heavy precipitation position around 700hPa. Normally the strength and scope of the storm in the mesoscale vortex area with heavy precipitation is stronger and bigger than that of the me- soscale auxiliary area. This time the atmospheric convergence movement in the basin is mainly around 850hPa, which leads the mesoscale system in this storm goes stronger and maintains strong convergence or divergence movement in the whole process. The non- equilibrium state goes gradually up and then gradually down. The continued non -equilibrium vibration stimulates low- level convergence and high -level divergence develop, thus strong atmospheric rising motion accompanied.

关 键 词：中尺度 非平衡振动 暴雨 

分 类 号：P458.2[天文地球—大气科学及气象学]