摘要
除了动量的局地变化和水平平流之外,本文讨论了动量垂直输送和β-效应在均质正压的Ekman边界层中的作用。利用奇异摄动方法,得到了精确到O(R_0~2)的Ekman边界层中水平风场的垂直结构和边界层顶垂直速度的解析表达式,对解的非定常和水平非均匀特征作了定性讨论。用一迭加在均匀西风气流上的园形、定常涡旋场的定量计算表明,动量垂直输送和β-效应对Ekman边界层中水平风速分布、边界层厚度及边界层顶垂直速度均有明显的影响。
The effects of vertical transfer of momentum and B-effect, besides those of Jocal time change and horizontal advection of momentum, on the dynamics of ba-rotropic Ekman boundary layer are investigated in this paper. By use of the singular perturbation method, the solutions of wind structure and the verticalvelocity at the top of boundary layer with errors not larger than O(R02 ) are obta-ined, and the correspondent qualitative properties of nonsteadiness and horizon-tal nonuniformity are discussed. Quantitative calculations are made in the case of a circular, stationary vortex superimposed on a uniform westerly current. It is shown that the effects of vertical transfer of momentum and B-effect on the wind structure, boundary layer thickness, and the vertical velocity at the top of boundary layer are all significant.
出处
《气象科学》
CSCD
北大核心
1990年第3期259-272,共14页
Journal of the Meteorological Sciences
