摘要
实际业务预报中,北京地区降水经常发生两种特殊情况,即明显系统移来时北京地区降水明显比周围偏多或偏少。对此,选取两个实例,利用中尺度非静力模式(MM5)进行了高分辨率数值模拟和敏感性试验。结果显示,该模式较成功地模拟出了这两次天气过程及其相关的中尺度系统的发生发展,还显示,凝结潜热对迎风坡天气过程的发生发展产生了重要作用,地表特征对背风坡天气过程产生了重要影响,而地形在两次天气过程中都起着主要作用,低层潜在不稳定能量的储备和输送是暴雨发生不可缺少的条件。
Two special weather events over Beijing are simulated,and a series of sensitivity experiments carried out using a nested grid version of PSU/NCAR's mesoscale model(MM5)with a fine mesh grid size of 15km.It is shown that these two events occurred in different synoptic scale environments;the MM5 model reproduces successfully the development of the two weather processes and their relevant mesoscale systems;latent heat release acts a vital role in the development of the weather-side waves process;landuse plays an important role in the development of the lee waves weather process;responses to topographic forcing in the two cases are rather sensitive;and the store and transportation of the low-level potentially unstable energy over Beijing are the crucial conditions for the formation and intensification of convection.
出处
《南京气象学院学报》
CSCD
北大核心
2004年第1期79-89,共11页
Journal of Nanjing Institute of Meteorology
基金
国家重点基础研究发展规划项目(G1999045700)
关键词
降水
预报
暴雨
中尺度系统
数值模拟
物理机制
torrential rain
mesoscale system
numerical simulation
physical mechanism
