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中文摘要: 利用卫星、雷达资料,分析了2002年6月24日北京地区大暴雨的降水云团演变特征,结果表明:中α尺度对流系统减弱过程中经历了中β尺度云团的发展过程,中β尺度对流云团是北京西部局地暴雨的影响系统:在观测分析的基础上进行了数值模拟分析:低层东风气流向西移动遇太行山东坡辐合抬升,黄土高原低层偏西风向东移动,受太行山脉强迫倾斜上升,与太行山东坡的地形抬升叠加,在太行山及其东坡产生强烈的上升运动,并形成垂直次级环流圈,同时,低层的偏南气流在燕山南坡上升,而冷空气偏北气流在燕山南坡半山腰下沉,该次级环流圈是北京西部山区强降水产生和维持的主要物理机制。
中文关键词: 地形,中尺度,暴雨,次级环流
Abstract:The characteristics of cloud cluster which brought the heavy rainfall in Beijing on June 24th 2002 is studied by use of satellites and radar data. The results show that during the weakening of meso-α convective systems, they may go through the evolution of meso-β scale convective cloud cluster systems which directly led to the heavy rainfall in the west of Beijing. Numerical simulation is done on the base of observational data analysis. Low-level eastern wind converged and rose on the eastern slope of Taihang Mountain where the low-level eastern wind moving westward from the Loess Plateau also rose slantwise by effects of topographic forcing, so strong vertical ascending motion generated on the Taihang Mountain and its eastern slope a secondary vertical circulation appeared. At the same time, low-level southern wind was ascending along the south slope of Yan Mountain where the cold air brought by northern wind was subsiding on the hillside, the forthcoming of this secondary vertical circulation was the main physical mechanism leading and maintaining the heavy precipitation on the west mountainous region of Beijing.
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基金项目:北京市自然科学基金重点项目:北京城市化发展对气象条件影响的机理研究(项目编号:8051002)资助
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引用文本:
矫梅燕,毕宝贵,2005.夏季北京地区强地形雨中尺度结构分析[J].气象,31(6):9-14.
,2005.Mesoscale Structure Analysis of Topography-induced Heavy Rainfall in Beijing in Summer[J].Meteor Mon,31(6):9-14.
矫梅燕,毕宝贵,2005.夏季北京地区强地形雨中尺度结构分析[J].气象,31(6):9-14.
,2005.Mesoscale Structure Analysis of Topography-induced Heavy Rainfall in Beijing in Summer[J].Meteor Mon,31(6):9-14.