不定常大氣運動論(第一報)

抄録

Recently the remarkable progress of the theory of non-stationary ocean currents has been made by Dr. K. Hidaka and others. In atmospheric motion, however, Dr. H. Arakawa discussed the development of the gradient wind when the eddy viscosity was a constant, and there still remain some problems such as a theory of a diurnal variation of wind velocity and direction, a phenomenon that a strong wind blows gradually downwards from the upper layer of the atmosphere and so on.
In this paper the author gave the solution for the non-stationary atmospheric currents, when the eddy viscosity was a function of a height and a time, and the slipping conditions on the ground were the followings:
where r(t), s(t) are slipping coefficients, using a set of orthogonal functions with which Dr. K. Hidaka had obtained many excellent results.
And he explained that the sence of the rotation of the wind at the different stations as shown by Prof. T. Terada and Prof. T. Okada, was due to whether the direction of the pressure gradient depending on the heating condition at the different topography rotated with the clock's hand or counter-clock's hand in the course of a day at the places.