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.
I have attempted to clear the nature of the earth's electromagnetic field by means of electrodynamics. It is proved that the conductivity of the earth lessens the storage of electric energy near the surface when there is no accumulation of charge.
The chemical analyses of the rain water were made through a year of 1934 at four stations in Tôkio and its suburbs. At the Central Meteorological Observatory situated in the central part of Tôkio, the rain-water is remarkably soiled by a large quantity of ammonium etc., especially in the daytime. At the both places, Narimune and Ogikubo situating in the suburbs of city of Tôkio, the quantity of ammonium and nitrate is greatly decreased and the difference between the amounts of daytime and night is not almost appeared in the observed data.
Hitherto, the equation of molecular diffusion has been applied to that of eddy diffusion without serious precaution, which will be justified when the problem is confined to one dimensional motion, but the extention of such a procedure to two or three dimen_??_ional diffusion meets with some unremovable contradictions. In this paper the present author tried one generalization of the term of eddy diffusion in two dimension empirically, denying the equipartition theory of eddying stress, which, in case of one dimension, accords well with Rossby's theory. As one application of the above derivation, the theory of monsoon wind has been deduced from the view-point of thermal convection current, from which the coefficients of kinematic eddy viscosity and eddy thermal diffusivity have been determined to be about 1010 cm2 sec-1 in horizontal direction and 105 cm2 sec-1 in vertical direction.
The height of the tidal waves caused by the meteorological agencies is determined mainly by the amount of the depression of the barometric pressure and by the velocity of wind blowing there. Barometric depression relates to the height of the tidal waves linearly but the wind velocity has a quadratic relation to it. The calculated height of the tidal waves using the meteorological data agrees quite well to the observed one. The largest error is only 0.3 feet. The oscillation of water in the bay has some influence on the height of tidal waves caused by the barometeric depression. The velocity of the propagation of the centre of depression is an important factor in this case.
A few years ago, one of the present authors has reported some results of the observation of the twilight, especially the observational data as to the colour, the intensity and the maximum point of the first purpurlight. In this paper the authors calculated the height of the dust sphere by the formula (1). The calculation showed it to be 14.6km.
The equation of the flow of radiative energy is solved for some values of the vap.-press. gradient. It is shown that considerable jumps of temperature distribution can occur, due to radiation, far above the limit of normal convection.
Applying the periodgram analysis to the daily minimum temperature at Hsinking it was found that the periods of 7 days and 10 days p_??_evail during cold season. The present author tried to express daily minimum temperature with two elements: fundamental seasonsl variation and periodic variations of short periods.