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Characteristics and implications of Pu isotopes in the northern South China Sea sediments
https://repo.qst.go.jp/records/71427
https://repo.qst.go.jp/records/7142749a3019d-d3ef-4466-b288-7a997dc7f93a
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-03-14 | |||||
| タイトル | ||||||
| タイトル | Characteristics and implications of Pu isotopes in the northern South China Sea sediments | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
呉, 俊文
× 呉, 俊文× 鄭, 建× 田上, 恵子× 内田, 滋夫× et.al× 呉 俊文× 鄭 建× 田上 恵子× 内田 滋夫 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 239+240Pu activities and 240Pu/239Pu atom ratios in sediments of northern South China Sea were determined to examine the spatial and temporal variations of Pu inputs. We clarified that Pu in the northern South China Sea is sourced from a combination of global fallout and close-in fallout from the Pacific Proving Grounds in the Marshall Islands where above-ground bomb testing was carried out during the period of 1952-1958. The latter source dominated the Pu input in the 1950s through atmospheric deposition, as evidenced by elevated 240Pu/239Pu atom ratios (>0.30) in a dated sediment core. Even after the 1950s, Pacific Proving Grounds was still a dominant Pu source due to continuous transport of remobilized Pu from the Marshall Islands along the North Equatorial Current followed by the transport of the Kuroshio and its intrusion into the South China Sea through the Luzon Strait. Using a simple two end-member mixing model, we have quantified the spatial and temporal variations of this Pu source term contributed from the Pacific Proving Grounds. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 2014 Ocean Science Meeting | |||||
| 発表年月日 | ||||||
| 日付 | 2014-02-26 | |||||
| 日付タイプ | Issued | |||||
