主办单位：中国气象局沈阳大气环境研究所
国际刊号：ISSN 1673-503X
国内刊号：CN 21-1531/P
气象与环境学报

气象与环境学报 ›› 2014, Vol. 30 ›› Issue (6): 16-24.doi:

• 论文 • 上一篇    下一篇

豫西地形对一次强降水过程的影响分析

张宁1,2 苏爱芳1,2   

  1. 1. 中国气象局河南省农业气象保障与应用技术重点开放实验室，河南 郑州 450003；2. 河南省气象台，河南 郑州 450003
  • 出版日期:2014-12-30 发布日期:2014-12-30

Influence of topography on a severe rainfall process in western He’nan province

ZHANG Ning1,2   SU Ai-fang1,2   

  1. 1. Key Laboratory of Agrometeorological Ensuring and Applied Technique, China Meteorological Administration, Zhengzhou 450003, China; 2. He’nan Meteorological Observatory, Zhengzhou 450003, China
  • Online:2014-12-30 Published:2014-12-30

PDF (PC)

547

被引次数

1

摘要：

利用中尺度模式WRF 3.3.1模拟了2007年7月29日豫西山区强对流天气过程，并进行了地形高度敏感性试验。结果表明：模式能够很好地再现此次强对流降水过程，模拟降水范围与强降雨中心均与实况较一致。分析对比控制试验和地形敏感性试验结果可知，地形的改变能够在水平和垂直方向上影响环流形势，进而影响降水的落区和中心量级。地形升高和迎风坡梯度增大使近地面层水平风场辐合增强，中层上升运动明显增大，且低层的水汽通量增大，导致雨带横向范围和降水中心量级明显增大；而地形降低和迎风坡梯度减小使山脉对近地面层气流的阻挡作用明显减弱，低层水汽通量显著降低，中层辐合抬升运动明显减弱，迎风坡前强降水中心减弱甚至消失，而山脉下游降水则有所增强。分析地形高度与山前降水的定量关系可知，降水中心量级随着地形升高或降低相应地增大或减小，但二者并非完全的线性正相关。

关键词: 中尺度模式, 强对流降水模拟, 地形敏感性试验

Abstract:

A severe convective rainstorm on July 29, 2007 in the western mountain area of He’nan province was simulated by a WRF3.3.1 mesoscale numerical model, and topographic sensitive tests were carried out at the same time. The results show that the model could simulate this process better, and simulated precipitation area and its center are coincident with the observed. A comparison of control test and topographic sensitive test shows that topographical change can affect both horizontal and vertical circulations as well as falling area of precipitation and its central rainfall level. When terrain height and gradient of windward slope rise, convergence of horizontal flow near the surface and lifting movement in middle level become stronger, and water vapor flux in low level increases, which increase the area and amount of rainfall. However, under the contrary conditions, strong precipitation center in the front of windward slope weakens or disappears. Also, precipitation in the lower reaches of mountain slightly increases. Analysis of relationship between topography height and precipitation of windward slope suggests that the latter rises or falls with the former changes correspondingly, while both are not an absolutely linear positive correlation.

Key words: Mesoscale numerical mode, Simulation of severe convective rainfall, Topographic sensitive test