Possible Amount of Total Radiation and Duration of Sun-shine in Japan

[摘要] From the results of total radiation observed with the Robitzschactinograph at several meteorological stations in Japan, the author of the present paper calculated the constant a in the formula Q=Q0{a+(1-a)S/S0}, proposed by A. Ångström, where Q is the daily amount of the total radiation observed, Q0 is the same amount when there is no cloud, S the observed value of the duration of sun-shine and S0 its pnssible value. The results of calculation of a are as follows.Tokyo 0.22, Nagasaki 0.25, Morioka 0.25 and Mt. Tukuba 0.23.Further he calculated a for various kinds of clouds, and he found that a is 0.40 for upper clouds, 0.35 for middle clouds and 0.22 for lower clouds.He also found that the total radiation in a clear day in Tokyo can be expressed approximately by the formula: Q0/S0=753/r2 sin h, where r is the distance from the earth to the sun measured in unit of its mean distance, and h the altitude of the sun at the time of the meridian transit; that this expression can be used approximately to the other stations.

[学科分类] 大气科学