中国民航大学学报

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一次强对流天气的数值模拟和风场结构分析

蒋立辉,鄢政,庄子波,刘佳颖   

  1. (中国民航大学民航气象研究所,天津300300)
  • 收稿日期:2012-11-27 修回日期:2013-02-27 出版日期:2014-02-24 发布日期:2014-01-02
  • 作者简介:蒋立辉(1964—),男,黑龙江齐齐哈尔人,教授,博士,研究方向为图像处理、光电子技术和民航气象等.
  • 基金资助:

    国家重点基础研究发展计划(973 计划)(2010CB731800);中央高校基本科研业务费专项(ZXH2010D020);国家自然科学基金项目(41075013)

Numerical simulations and wind field analysis of severe convective weather

JIANG Li-hui,YAN Zheng,ZHUANG Zi-bo,LIU Jia-ying   

  1. (Civil Aviation Meteorological Institute,CAUC,Tianjin 300300,China)
  • Received:2012-11-27 Revised:2013-02-27 Online:2014-02-24 Published:2014-01-02

摘要:

利用数值预报模式WRF3.3 和1°×1°的NCEP气象再分析资料,对2012年4月27日发生在白云机场的一次强对流天气过程进行了数值模拟,模拟中采用三层嵌套的方式,利用可视化工具GRADS对模式输出的模拟结果进行研究分析。结果表明:WRF 模式能较好地模拟出此次强对流天气过程,低空950 hPa 的中尺度正涡辐合中心与高空200 hPa 的中尺度负辐散中心的相互耦合,能量相互释放是强对流天气得以维持和发展的重要原因;强天气威胁指数大小在某种意义上能够良好地反映出强对流天气发生的强弱程度。

关键词: 数值模拟, WRF模式, 强对流天气, 诊断分析

Abstract:

A severe convective weather occurring at the Baiyun Airport on Apirl 27,2012 is simulated by using WRF3.3(Weather Research and Forecasting Model,Version 3.3)and NCEP (National Center of Environment Predicting),meteorological data with 1°×1°grid are reanalyzed,making a deep diagnostic analysis with three nested simulation and visualization tools GRADS.The results show that there is a strong simulating ability for the severe convective weather process by WRF. It is important for this weather that the 950 hPa mesoscale eddy convergence center couples mutually with the 200 hPa mesoscale negative divergence center,energy is interchanged between each other. Compared with the different resolution wind field data,there is a greater impact at the lower atmosphere as improving the resolution;there is a certain degree of positive correlation between the size of severe weather threat index and the occurrence of severe convective weather.

Key words: numerical simulation, WRF mode, severe convective weather, wind field analysis

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