摘要
利用WRF中尺度模式对湖南省2009-07-24～27的暴雨天气过程进行数值模拟和诊断分析,模拟结果为:暴雨中心位置以及雨强与实况基本一致,但降水范围较实际偏大。诊断分析WRF模式输出的物理量发现:强降水落区与假相当位温最大值区相对应;涡度(散度)的低层辐合、高层辐散的高低空配置为强降水提供了动力条件。结合NCEP分析场、分析能量场和水汽条件,假相当位温高值区和水汽通量散度最大辐合中心与暴雨的落区有很好的一致性,表明WRF中尺度模式和NCEP分析场对这场连续暴雨都有很好的指示意义。
According to WRF mesoscale model, numerical simulation and diagnostic analysis for rainstorm weather process are carried out on 24th to 27th July, 2009 in Hunan province. The simulation results show that the central position and intensity of rainstorm are basically identical with practical situation,but precipitation range is actually larger. According to diagnostic analysis on WRF output physical quantity,it finds out the rainfall area is relative to maximum area of potential pseudo- equivalent temperature. The vorticity （divergence） low level convergence and high level divergence of high altitude are configured to provide dynamic condition of heavy rainfall. Combined with NCEP analysis field, energy field and water vapor condition, high value area of potential pseudo-equivalent temperature and maximum convergence center of moisture flux divergence has a good consistency with rainfall area, which show that WRF mesoscale model and NCEP analysis possesses the fairly indication for the continuous rainstorm.
出处
《气象水文海洋仪器》
2013年第1期36-40,共5页
Meteorological,Hydrological and Marine Instruments
关键词
暴雨
数值模拟
诊断分析
假相当位温
水汽通量散度
rainstorm
numerical simulation
diagnostic analysis
potential pseudo-equivalent temperature
watervapor flux divergence
作者简介
林明丽（1969-），女，大学，高级工程师．从事天气预报和气象服务工作．
