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日本海大和堆および沿岸周辺海域における^<226>Ra,^<228>Raおよび^<137>Cs濃度の鉛直分布
http://hdl.handle.net/2297/32416
http://hdl.handle.net/2297/32416fc563da6-8752-4566-ba61-ec3982bda2b9
名前 / ファイル | ライセンス | アクション |
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INET-PR-INOUE-M-167.pdf (957.8 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-10-05 | |||||
タイトル | ||||||
タイトル | 日本海大和堆および沿岸周辺海域における^<226>Ra,^<228>Raおよび^<137>Cs濃度の鉛直分布 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Vertical profiles of ^<226>Ra, ^<228>Ra and ^<137>Cs activities in seawater around the Yamato Ridge and coastal areas of the Sea of Japan | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
田中, 究
× 田中, 究× 井上, 睦夫× 御園生, 淳× 小村, 和久 |
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書誌情報 |
地球化学 = Geochemical Journal 巻 40, 号 3, p. 167-176, 発行日 2006-08-25 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0386-4073 | |||||
NCID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00141280 | |||||
出版者 | ||||||
出版者 | 日本地球化学会 = Geochemical Society of Japan | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | To obtain implications for the vertical water mixing within the Sea of Japan, we collected 29 water samples from 2 sites around the Yamato Ridge (3,685 m and 2,610 m depth), and 24 samples from coastal areas (12 sites) along the Japan Island (85-475 m depth) in May-June 2004 and 2005. ^<226>Ra (t_<1/2>=1,600 y), ^<228>Ra (5.75 y) and ^<137>Cs (30.2 y) were quantitatively coprecipitated by BaSO4 and AMP using 20-60 L of water samples, and their activities were measured by low-background y-spectrometry. From surface to the Upper Proper water (1-1,000 m), the ^<228>Ra and ^<137>Cs activities exhibit gradual decrease from 1.8-0.2 mBq/L and 1.7-0.2 mBq/L, respectively. From the gradient of ^<228>Ra activity, the vertical eddy diffusivity was calculated to be 〜6 cm^2/s around the Yamato Ridge. In the Deep Proper Water (>1,000 m), the ^<228>Ra activity keeps approximately constant (〜0.2 mBq/L). These vertical distributions are reflecting the intense vertical mixing compared with those in other oceans. For deep sites of coastal areas (>〜250 m depth), the ^<228>Ra activities of bottom waters are notably lower (〜0.5 mBq/L) than those of shallow sites (<〜250 m) (0.7-2.2 mBq/L). The exchange of radium between shallow and deep water is inhibited by the boundary layer (thermocline at 〜250 m depth). | |||||
権利 | ||||||
権利情報 | 日本地球化学会 | 本文データは学協会の許諾に基づきCiNiiから複製したものである | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | http://www.geochem.jp/ | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | http://ci.nii.ac.jp/naid/110008680122 |