Seasonal variation of 7Be deposition in Japan |
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| Authors: | Y. Narazaki K. Fujitaka S. Igarashi Y. Ishikawa N. Fujinami |
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| Affiliation: | (1) Fukuoka Institute of Health and Environmental Sciences, 39, Mukaizano, Dazaifu, Fukuoka, 818-0135, Japan;(2) National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba, 263-8555, Japan;(3) Fukui Prefectural Environmental Radiation Monitoring Center, 39-4, Harame-cho, Fukui, 910-0825, Japan;(4) Environmental Radioactivity Research Institute of Miyagi, Ise, Onagawa-cho, Miyagi, 986-2261, Japan;(5) Kyoto Prefectural Institute of Hygienic and Environmental Sciences, Fushimi-ku, Kyoto, 612-8369, Japan |
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| Abstract: | Seasonal variations of 7Be deposition in regions throughout Japan (26°18'N-43°05'N, 127°54'E-141°27'E) were observed during the period of 1989-1995. The observation indicated that 7Be deposition peaked in spring all over Japan except in the inland central basin. However, spring peak was not always the annual maximum. Along the coastal side of the Japan Sea, especially around Hokuriku region, 7Be deposition was at its maximum in winter. In addition, September peak also was observed in some regions, which was presumably caused by high precipitation or blowing in of northern air stream. Variations were classified into 4 types according to meteorological factors and local geographical conditions: winter peak, double peaks (spring and September peaks), spring peak and non-peak. A correlation between 7Be deposition and precipitation was observed in winter. |
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