Helium isotopes of seawater in the Philippine Sea and the western North Pacific
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- TAKAHATA NAOTO
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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- TOKUKAKE TAICHI
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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- SHIRAI KOTARO
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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- FUJIO SHINZOU
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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- TANAKA KIYOSHI
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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- SANO YUJI
- Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo
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We measured helium isotopic ratios of 84 seawater samples from various depths collected in the western North Pacific Ocean and the western Philippine Sea. The 3He/4He ratios varied significantly from δ3He of 0.1% to 22.9%, where δ3He is defined as the percent deviation of the helium isotopic ratio relative to the atmospheric standard. Maximum δ3He > 20% was observed at mid-depth (2000-2500 m) in the western Philippine Sea and in the southern part (∼10°N) of the western North Pacific, though not in the northern part (∼30°N) at the same depth. Contour maps of the lateral δ3He distribution at mid-depth suggest that the helium-3 plume derived from the East Pacific Rise does not flow northward along the Izu-Ogasawara-Mariana Ridge but westward through the Caroline Basin or the Yap-Mariana Junction into the Philippine Sea. It then flows northward in the western Philippine Sea to a region adjacent to the Japanese Islands. Although these flows inferred from the δ3He distribution are roughly similar to those estimated from water properties such as isopycnal distributions, the δ3He distribution could reveal that deep-water circulation seems to be different at each depth (2000, 2500, 3000 m).
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 44 (6), 451-460, 2010
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
- 1390282679529713920
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- NII論文ID
- 10027719850
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BC3MXjtFahsr8%3D
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 10936220
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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