对华北锢囚锋个例的数值模拟分析

A Numerical Simulation of the Occluded Front in North China

运用非静力中尺度模式（ＭＭ５）对１９９８年１１ 月２０～２１日的华北锢囚锋形成过程进行数值模拟。结果表明：本次锢囚锋结构在空间尺度上小于典型温带气旋锢囚锋，降水落区与锢囚锋性质（暖性）有关，因此，潜热释放对锢囚锋的维持起一定的作用；去掉太行山后，锢囚锋形成的时间会偏早，地点偏西，强度偏弱，因此。

By using the non static mesoscale model MM5, the forming process of the occluded front in North China during the period of November 20—21, 1998 was numerically simulated.It is shown from the sensitivity tests that the spatial scale of the occluded front in North China is smaller than that of the ideal .The area of precipitation is contact with the character of the occluded front, and the condensed latent heat affect the maintaining of the occluded front in North China. The topography played a determinant role in maintaining the occluded front in North China. If no topography, the occluded fronted which is weaker will form earlier at the western side of normal place.