地形对昆明准静止锋影响的数值模拟研究

A Numerical Study of the Effect of Terrain on Kunming Quasi-Stationary Front(KQSF)

利用2008年1月NCEP/NCAR全球1°×1°再分析资料和MM5中尺度数值模拟结果,分析研究了昆明准静止锋的结构和位置。结果表明:在中国南方地区持续、频繁受冷空气影响下,昆明准静止锋的形成和维持是高原地形的阻挡和特定天气系统配置共同作用的结果;通过对地形减半的敏感性数值试验,定量分析得到高原地形阻挡作用是昆明准静止锋形成和维持的必要条件。

The numerical simulation using the NCEP/NCAR 1 °×1 ° global reanalysis in January 2008 and the MM5 mesoscale model is performed to investigate the structure and characteristics of Kunming quasi-stationary front （KQSF） during the extreme low temperature and frozen snow events over southern China. The results indicate that the formation and its maintenance of KQSF are the consequence of the obstruction due to plateau terrain and special synoptic system configuration under the influence of the long-time, repeating cold airs over southern China. It is found that the obstruction of plateau terrain is necessary for the formation and the maintenance of KQSF by the sensitivity numerical experiments of halving terrain.