2013年7月广西一次罕见季风槽暴雨分析  

Analysis of a rare monsoon trough rainstorm of Guangxi in July 2013

作　　者：刘晓梅[1] 陈见[1] 高安宁[1] 赵金彪[1] 周云霞[1] 

机构地区：[1]广西气象台,南宁530022

出　　处：《气象研究与应用》2015年第2期54-58,I0005,共6页Journal of Meteorological Research and Application

基　　金：广西自然科学基金项目"广西持续性暴雨中尺度特征诊断分析和预报技术研究"(2011GXNSFA018011);广西区气象局重点科研项目(桂气科201304)

摘　　要：利用常规观测、雷达探测和自动站等资料对2013年7月26-27日发生在广西的一次罕见的季风槽暴雨过程进行分析,结果表明:(1)此次暴雨过程具有持续时间长,短历时降雨强,过程雨量非常之大,灾害十分严重等特点。(2)此次暴雨过程是非常典型的暖区暴雨。是在副热带高压发展较强、亚洲季风槽非常活跃的背景下,由南海季风槽发展而成的特殊罕见的深厚季风涡旋移入广西造成。季风涡旋的垂直伸展厚度和降水强度呈正相关。(3)大气环流形势的异常是季风槽加强和维持的原因。地面西低东高的气压场形势和副热带高压脊线呈NW-SE走向使得季风槽能够向北推进并西移进入广西。(4)此次季风槽暴雨过程的高低空配置虽然基本符合广西热带辐合带影响暖区暴雨模型,但也有其特殊之处,如季风槽辐合带的水平尺度较小,但垂直尺度和时间尺度较大;其北上受其它因素影响而非台风的牵动等。Based on the conventional observation, radar detection and automatic station rainfall data, a rare monsoon trough rainstorm is analyzed on 26th -27th July 2013 in Guangxi. The results show： （1） the heavy rain process had the characteristics of the long duration, the strong rainfall intensity rainfall the heavy total rainfall and causing the serious disaster. （2） Under the background of the strong subtropical high and the very active Asian monsoon trough, this process, which was very typical of the warm sector rainstorm, was caused by a special rare deep monsoon vortex formed by the monsoon trough moving into Guangxi. The height of vortex vertical was positively related to the rainfall intensity. （3） Anomalies of atmospheric circulation made the monsoon trough strengthen and maintain. The west-low and east-high pressure field and the subtropical high ridge toward NW-SE made monsoon trough move into Guangxi. （4） Although the High and low level configuration of the monsoon trough rainstorm process was consistent with the warm sector rainstorm model by the influence of Guangxi tropical convergence zone, it has its unique features; like： the small horizontal scale and the large vertical and time scale of monsoon trough; the northward movement was affected by other factors rather than by typhoon etc.

关 键 词：南海季风槽 特大暴雨 季风涡旋 垂直厚度 暴雨模型 

分 类 号：P458.121.1[天文地球—大气科学及气象学]