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Meteorological parameters contributing to variability in 222Rn activity concentrations in soil gas at a site in Sapporo, Japan

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タイトル: Meteorological parameters contributing to variability in 222Rn activity concentrations in soil gas at a site in Sapporo, Japan
著者: Fujiyoshi, Ryoko 著作を一覧する
Sakamoto, Keita 著作を一覧する
Imanishi, Tsukushi 著作を一覧する
Sumiyoshi, Takashi 著作を一覧する
Sawamura, Sadashi 著作を一覧する
Vaupotic, Janja 著作を一覧する
Kobal, Ivan 著作を一覧する
キーワード: 222Rn
Soil gas
Continuous monitoring
Meteorological parameters
Seismic effects
発行日: 2006年10月15日
出版者: Elsevier B.V.
誌名: Science of The Total Environment
巻: 370
号: 1
開始ページ: 224
終了ページ: 234
出版社 DOI: 10.1016/j.scitotenv.2006.07.007
抄録: Continuous 222Rn monitoring in soil gas since November 22, 2004 has revealed variability in activity concentration with time in the semi-natural woods on the campus of Hokkaido University in Sapporo, Japan. Among various factors affecting soil radon levels and variability, temperature was found to be dominant during three seasons when activity concentrations of 222Rn showed a diurnal high and nocturnal low with a boundary around 10 o'clock in the morning. This pattern was disturbed by low pressure fronts with occasional rain. The activity gradually decreased as soil temperatures decreased from late November to mid-December. After the ground surface was completely covered with snow, soil radon levels became low with a small fluctuation. There were several peaks of 222Rn on the time-series chart in winter. Those peaks appearing in early winter and early spring may be interpreted by considering meteorological parameters. In a few cases, the radon activity suddenly increased with increasing pressure in the soil at a depth of 10 cm, which may be associated with subsurface events such as seismic activity in the area.
Relation (URI): http://www.sciencedirect.com/science/journal/00489697
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/15422
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤吉 亮子

 

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