The Observation of the Ultraviolet Radiation at Kirigamine

[摘要] 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).

[学科分类] 大气科学