摘要
用大气边界层运动方程的数值积分方法,研究了自由大气(边界层顶)风水平非均匀、非定常扰动对地形边界层的内参数u./G(u.为摩擦速度,G为自由大气风速)的影响。结果表明:在大尺度模式边界层参数化问题中,由于大尺度风压场的非定常与水平非均匀性,直接引用定常、水平均匀的经典阻力定律有误差,应考虑非定常、非均匀性及地形作用的修正。
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.
出处
《南京气象学院学报》
CSCD
1992年第4期531-539,共9页
Journal of Nanjing Institute of Meteorology
关键词
大气
扰动
地形
边界层
内参数
disturbance
internal parameter
boundary layer
topography
