1804号台风“艾云尼”造成广州市特大暴雨的成因分析  

Analysis of the Causation for an Unusually Heavy Rain in Guangzhou Caused by Typhoon Ewiniar (1804)

作　　者：杨守懋 王娟怀[2] 郭腾[3] 王亚楠 郭飞云 YANG Shou-mao;WANG Juan-huai;GUO Teng;WANG Ya-nan;GUO Fei-yun(Meteorological Bureau of Baiyun District,Guangzhou,Guangzhou 510040;Climate Center of Guangdong Province,Guangzhou 510641;Meteorological Bureau of Guangzhou,Guangzhou 511430)

机构地区：[1]广州市白云区气象局,广东广州510000 [2]广东省气候中心,广东广州510000 [3]广州市气象局,广东广州510000

出　　处：《广东气象》2020年第2期31-35,共5页Guangdong Meteorology

基　　金：广东省气象局科学技术研究项目(GRMC2018Q15)。

摘　　要：利用常规观测资料、加密自动站资料、NCEP 2.5°×2.5°逐6 h再分析资料和广州多普勒雷达资料,对1804号台风"艾云尼"造成广州6月8日特大暴雨降水进行了成因分析。结果表明:"6·8"广州特大暴雨呈现与地形相关性大的南北带状分布特征;特大暴雨是由"艾云尼"本体对流沿切向发展的较强的螺旋云带产生,前期西南季风的爆发以及南海偏东风的低空急流为特大暴雨的产生提供充足水汽条件,低层辐合高层辐散的配置、不稳定能量积聚释放都为暴雨发生提供了条件;暴雨发生时降雨回波列车效应明显,暴雨过程具有雨强、累积雨量较大的特点。Using conventional observation data, data from intensified automatic weather stations, NCEP six-hourly reanalysis and data from a Doppler radar in Guangzhou, this work analyzes the causation for an unusually heavy rain on June 8, 2018 in the city that was caused by Typhoon Ewiniar(1804). The result is shown as follows. The rain presented a north-south stripe-like distribution that was well related with the terrain. Generated from an intense spiral cloud band developing tangentially from Ewiniar’s own convection, the rain was supplied with sufficient water vapor by both a southwest monsoon that started earlier and a low-level jet stream in the easterly over the South China Sea, together with a pattern of low-level convergence and high-level divergence and the accumulation and release of instability energy. During the rain, which was characterized by large rain rates and accumulated rain amounts, the so-called "train effect" was evident in the rain echo.

关 键 词：天气学 台风“艾云尼” 特大暴雨 广州 

分 类 号：P44[天文地球—大气科学及气象学]