Abstract
The amount of chlorine was chemically analysed on the 17 samples of precipitation taken during August 5, 1947 and January 1, 1948 at the Nagano City, and it was found that the groyp distribution of chlorine does not exist, which H. Köhler and H. Israel published to be so in fog and rain, respectively. Besides this a new fact was found that the chlorine contained in rain has a close relation to the air-mass that occupies the area at the time of the precipitation.
The amount of chlorine in each of the four kinds of air-masses, which the author has classified, are as listed below.
These results can be summarized as follows: (1) The amount of chlorine in precipitation is fifty times larger when the air-mass of the Pacific Ocean origin occupies the area than when that from the Japan Sea side occupies: (2) The air-masses of Siberia or Japan Sea origin can still be classified into two kinds, that is, the air-mass generated in September and that generated in Winter. The former is accompanied by smaller amount of chlorine than the latter. The author suggests that the difference of the amount of chlorine accompanied with these air-masses is due to the causes, such as, the difference of the areas of the Japan Sea and of the Pacific Ocean, the concentration of chlorine content, etc.
