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。
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.
出处
《南京气象学院学报》
CSCD
北大核心
2007年第4期457-462,共6页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(40505020)
北京市科委项目(H020620250330)
关键词
边界层急流
局地暴雨
正反馈作用
数值模拟
low level jet
local heavy rain
positive feedback
numerical simulation
