拉萨航路一次颠簸过程的成因分析和数值模拟

颠簸是成都—拉萨航路影响飞行安全与正常的重要因素。本文分析了2009年10月23日发生在拉萨航路太昭航段的两例颠簸事件,并利用WRF模式进行了数值模拟预报。结果表明,这是一次典型的晴空颠簸过程,在高空急流区边缘,冷暖平流交汇的梯度带上,上升和下沉气流的转换区域内产生了飞机颠簸。分析WRF模式计算得到的L_P颠簸指数,能够确定飞机颠簸发生的区域、高度和强度,具有一定的预报指示意义。 

Numerical Simulation and Analysis of a Process of Turbulence on Lasa Airway

Turbulence is an important element which impacts flight security and normality on Chengdu-Lasa airway.Two turbulence events occurring at Taizhao segment of Lasa airway on 23 Oct 2009 are analyzed as well as forecasted in the way of numerical simulation using WRF model.The result manifests that these two events feature the process of CAT (Clear Air Turbulence), in which the aircraft turbulence happens in the edge of upper air jet stream, the gradient zones where cold and warm advection convergence, or the areas where upward and downward flow switch into each other.The L_P turbulence index calculated though WRF model analysis is able to fix where aircraft turbulence will happen and its height and intensity, so it has certain instructional significance of forecasting.