武汉"6·22"空难下击暴流的三维数值模拟研究

使用武汉实测探空资料,利用三维强风暴冰雹分档模式对2000年6月22日发生在武汉的一次引起坠机事件的下击暴流进行了模拟和分析,并与实际观测进行了比较研究,结果表明:造成此次空难的下击暴流的发生发展与大的天气背景紧密相关;模拟微下击暴流的各种主要结构和生消演变特征与实测结果吻合较好;该下击暴流产生的直接原因是冰雹的重力拖曳作用引起,其次是冰雹的融化和雨水蒸发的冷却作用.空中散度和涡度的分布与变化同下击暴流也存在密切的联系.

A Numerical Study of the Airplane Disaster-Producing Microburst on 22 June 2000 in Wuhan

A three dimensional cloud model was used to simulate and analyze a severe microburst which caused an aircraft accident on 22 June 2000 in Wuhan The simulated results have been compared with those observed The results show the occurrence and development of the downburst producing storm are closely related to the large scale meteorological background The simulated results are very close to the observed characteristics of the downburst producing storm It is found that the downburst was primarily produced by hail loading and enhanced by melting of hail and evaporation of rain The variation of vorticity and divergence in the storm also has close relationship with the production of the downburst