边界层急流与北京局地强降水关系的数值研究
投稿时间:2006-08-11  修订日期:2007-02-25  点此下载全文
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作者单位
郑祚芳 北京城市气象研究所, 北京, 100089 
张秀丽 空军气象中心, 北京, 100843 
基金项目:国家自然科学基金资助项目(40505020);北京市科委项目(H020620250330)
中文摘要:应用3 km分辨率的中尺度模式,成功模拟出了2005年8月3日凌晨北京地区一次局地强降水过程,在此基础上探讨了地形热力作用和局地强降水与边界层急流的关系,结果表明,局地强降水与边界层急流之间存在正反馈作用,降水过程通过改变局地大气温度场的分布,导致边界层气流加速和急流的形成。而边界层气流的加速又加强了急流前方的风速辐合,为降水提供更多的水汽和更有利的动力条件。
中文关键词:边界层急流  局地暴雨  正反馈作用  数值模拟
 
Numerical Study on Relationship between Low Level Jet and Local Heavy Rain in Beijing
Abstract:The process of local heavy rain in Beijing on 3 August 2005 is numerically successfully simulated by the high-resolution MM5 model.Based on the results of numerically simulation,the relationships among boundary layer jet,the thermodynamic effects of topography,and local heavy rain are studied,and the positive feedback between local heavy rain and low level jet is revealed that heavy precipitation resulted in the acceleration of boundary layer flow and the formation of the jet through changing the distribution of local temperature,and in turn the acceleration of boundary layer flow enhanced the convergence in the front of the jet,thus providing precipitation with more moisture and favorable dynamic condition.
keywords:low level jet  local heavy rain  positive feedback  numerical simulation
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