Neodymium isotopic composition and concentration in the Southwest Pacific Ocean
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- AMAKAWA HIROSHI
- High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University Atmosphere and Ocean Research Institute, The University of Tokyo
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- TAZOE HIROFUMI
- Institute of Radiation Emergency Medicine, Hirosaki University
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- GAMO TOSHITAKA
- Atmosphere and Ocean Research Institute, The University of Tokyo
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- OBATA HAJIME
- Atmosphere and Ocean Research Institute, The University of Tokyo
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- SANO YUJI
- Atmosphere and Ocean Research Institute, The University of Tokyo
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- SHEN CHUAN-CHOU
- High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University
書誌事項
- 公開日
- 2013
- 資源種別
- journal article
- DOI
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- 10.2343/geochemj.2.0260
- 公開者
- 一般社団法人日本地球化学会
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説明
We report two vertical profiles of the concentration and isotopic composition of neodymium (Nd) in seawater samples collected at 20°S and 30°S along a longitude of 170°W in the Southwest Pacific Ocean. At depths below 500 m, Nd isotopic composition values are less radiogenic than those obtained from the subtropical North Pacific. The minimum εNd values of -8.0 and -6.9 at depths of 800 to 1000 m correspond to Antarctic Intermediate Water (AAIW). The differences in εNd values between upper deep water (2000-3000 m) and lower deep water (>4000 m) seem to be associated with Upper and Lower Circumpolar Deep Waters (UCDW and LCDW, respectively). The radiogenic Nd supply to AAIW from the Society Islands is estimated to be 30 ± 22 tons Nd/yr, which is consistent with the estimates from previous studies conducted in the same location and the oceanic region close to the Hawaiian Islands. Our study demonstrates the uniqueness of Nd isotopic composition distributions in the Southwest Pacific Ocean. These results may be valuable for tracing present and past ocean circulation in this region.
収録刊行物
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- ＧＥＯＣＨＥＭＩＣＡＬ ＪＯＵＲＮＡＬ
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ＧＥＯＣＨＥＭＩＣＡＬ ＪＯＵＲＮＡＬ 47 (4), 409-422, 2013
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679530094464
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- NII論文ID
- 10031195572
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BC3sXhslertr7P
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 024804637
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- NDLサーチ
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
