论赤道地区的大气边界层

本文给出了赤道地区线性Ekman层的控制方程及其解答,指出如果考虑了边界展与自由大气相互作用的物理机制,则大气的位势高度不应该完全独立于边界层.利用这一观点,可以对高度场给以一定的合理约束,使自由大气与边界层内之解具有合理的连续分布。这样,便可克服在临界纬度上垂直速度无限增大的困难。同时,还得到了在临界纬度上,边界展的风速解不呈Ekman螺线的新的结果。利用Mahrt所提出的充分混和的条件,来验证这一结论,得出相同的特点,这也说明所得出的结果具有一定的合理性的。     

ATMOSPHERIC BOUNDARY LAYER IN EQUATORIAL AREA

A system of linearized equations which describe the motion in the tropical boundary layer and their solutions are given in this paper. If the interaction between the boundary layer and the free atmosphere is taken into consideration, the potential height of the free atmosphere cannot be entirely independent of the character of the boundary layer. From this point of veiw, the continuous and bounded solutions of the boundary layer are obtained by imposing some suitable conditions to the field of potential height and thus the difficulty that the vertical velocity at the critical latitude tends to infinity can be overcome. Furthermore, a new result that the variation of the wind with height in the boundary layer at the critical latitude is not in the form of classical Ekman spiral is obtained. And this is also supported by the result obtained under the assumption of the so-called well-mlxed condition proposed by Mahrt.