Chemical characteristics of hadal waters in the Izu-Ogasawara Trench of the western Pacific Ocean
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- GAMO Toshitaka
- Atmosphere and Ocean Research Institute, The University of Tokyo
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- SHITASHIMA Kiminori
- School of Marine Resources and Environment, Tokyo University of Marine Science and Technology
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<p>Vertical profiles of potential temperature, salinity, and some chemical components were obtained at a trench station (29°05′N, 142°51′E; depth = 9768 m) in the Izu-Ogasawara (Bonin) Trench in 1984 and 1994 to characterize the hadal waters below ∼6000 m depth. We compared portions of both the 1984 and 1994 profiles with nearby data obtained between 1976 and 2013. Results demonstrated that the hadal waters had slightly higher potential temperature and nitrate and lower dissolved oxygen than waters at sill depths (∼6000 m) outside the trench, probably due to the effective accumulation of geothermal heat and active biological processes inside the trench. The silicate, iron, and manganese profiles in 1984 showed slight but significant increases below ∼6000 m depth, suggesting that these components may have been intermittently supplied from the trench bottom. Significant amounts of 222Rn in excess over 226Ra were detected in the hadal waters up to 2675 m from the bottom, reflecting laterally supplied 222Rn from the trench walls.</p>
収録刊行物
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- Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences
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Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences 94 (1), 45-55, 2018
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詳細情報 詳細情報について
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- CRID
- 1390001204147979264
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- NII論文ID
- 130006307229
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- NII書誌ID
- AA00785485
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- ISSN
- 13492896
- 03862208
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- NDL書誌ID
- 028795488
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- PubMed
- 29321446
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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
- Crossref
- PubMed
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可