自由大气的扰动对地形大气边界层内参数的影响

INFLUENCE OF THE FREE ATMOSPHERIC DISTURBANCE ON THE INTERNAL PARAMETER IN THE TOPOGRAPHIC ATMOSPHERIC BOUNDARY LAYER

By numerical integration of the ecluation of the atmospheric boundary layermotion,a study is conducted of the influence of the horizontally nonhomogeneous, non-stationary disturbance of the free atmospheric (at the top of the boundary layer)wind onthe internalparameter u. /G (u. is the friction velocity and G the wind velocity of thefree atmosphere). Results indicate that in the parameterization of the large-scale modelboundary layer, owing to the non-stationariness and horizontal non-homogeneousnessof the large-scale wind pressure field there exist errors when the classic stationary,horizontally homogeneous resistance law is directly used. It is, therefore, necessary toconsider a revision of non-stationariness and non-homogeneousness as well as topo-graphic forcing.