In the present paper, the author will endeavor ot classify the air masses of the North Pacific Ocean, as: 1. Arctic-Polar Air masses, (Siberian Air Mass and Canadian or Alaskan Air Mass) 2. Polar Pacific Air Mass 3. Tropical_??_ritime Air Mass 4. North-East Trade Wind 5. South-East Trade Wind 6. South-West Monsoon
This investigation was carried out in order to co_??_firm the theory that the frost heaving is caused by the ice filaments occured under the ground. An apparatus was designed for producing the frost heaving and was used in the cold chamber belonging to the Low Temperature Laboratory. The paocess of the segregation of ice in the f_??_ozen soil is found to be as follows. As the freezing of soil proceeds, hair cracks. take place just below the freezing line, the cracks are filled with ice, thin ice layers are formed, they becomes thicker, the next cracks take place below the ice layers thus produced, the second cracks are again filled with ice. When the freezing line stops to descend for a long while and the water is continuously supplied from the unfrozen soil below, the ice layers grow into thick ones which the composed of ice filaments. Adjusting the temperature of the atmosphere and that of subgrade water, any specified form of segregation of ice are produced in the laboratory.
In the Last winter, we made the observation of the Ultraviolet radiation at Kirigamine, Nagano Prefecture, and the results obtained are summarized as follows:- 1) The correlation coefficients between the intensity of the UV-radiation reflected by the snow surface and that of the sky UV-radiation, that of the (direct) solar UV-radiation, and the total UV-radiation respectively, are rsky.=0.47, rsol=0.55, rtot.=0.88. The albedo for the UV-radiation does not necessarily increase with the solar altitude. 2) From the data gained at the top, in the middle of the slope, and at the foot of the mountain, the transmission coefficient of the atmosphere for the UV-radiation are obtained to be ah=46°20', ah=35°26' (h: altitude of the sun) 3) We cut the snow into several layers and observed the transmitted. UV-radiation. The absorption coefficients of the snow are 0.133 (for fresh snow) 0.704 (for crusted snow) (Feb. 24th, 1942).