Recent Variation in the Atmospheric Radiocarbon and the Problem of Transfer of Radiocarbon into Hydrosphere
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概要
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Recent variation on the atmospheric radiocarbon was measured using tree ring samples grown at three different places in Honshu Island of Japan. These three series of measurements on the annual variation of radiocarbon content showed good agreement each other. The observed increase of radiocarbon content in these samples indicates a remarkable increase after 1954. The percentage increase of the atmospheric radiocarbon is 8% in 1957 and 24% in 1959. The evaluation of the variation of radiocarbon content in the surface layer of the ocean water was done assuming the observed variation of radiocarbon in the atmosphere. The relation between the variation of C-14 in the atmosphere and the sea water gives a way to evaluate the residence time of carbon dioxide in the atmosphere and the sea water. The detailed examination on this problem leads to the conclusion that the observed variation of C-14 content in the atmosphere and the sea water gives rather poor results of the numerical informations on the residence times of carbon dioxide in the atmosphere and the sea water. However if we have some exact knowledge on one of the residence times of carbon dioxide in the atmosphere or the sea water, we can get a reliable knowledge on the mean depth of the mixed layer of the ocean sea water. Using the residence time of 7 years of a carbon atom in the atmosphere and the mean depth of 75 meters of the mixing layer, the expected increase of radiocarbon in the surface water of the ocean is 1.7% in January 1958 and 4.7% in January 1960.
- 日本放射線影響学会の論文
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関連論文
- 木曽川泥流のC^年代のヴュルム氷期年代学にたいする意義
- Recent Variation of Atmospheric Contents of C-14 in Tokyo and Transfer Problem of Atmospheric Carbon Dioxide
- Recent Variation in the Atmospheric Radiocarbon and the Problem of Transfer of Radiocarbon into Hydrosphere