A novel dissolved O2 consumption process in mesopelagic waters inferred from observation and model simulation of dissolved oxygen delta18O in open oceanic regions
Project/Area Number |
24710002
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Environmental dynamic analysis
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Research Institution | The University of Tokyo |
Principal Investigator |
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Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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Keywords | 溶存酸素 / 安定同位体比 / 酸素消費過程 / 酸素消費プロセス / 酸素安定同位体比 / 懸濁粒子 |
Outline of Final Research Achievements |
We explored how physical and biological processes affect to the O2 concentrations and d-18O of dissolved O2 relationship in seawater applying a 3-D OGCM to data obtained field observations and laboratory experiment. It failed to reproduce when we adopted the previously reported isotopic fractionation factor (a = 0.98), and prescribed physical parameters. The discrepancy became larger when oxygen saturation level decreased. Sensitivity experiments revealed that (1) the intensity of O2 consumption rate nor physical processes (diffusion/advection) could explain the observed relationship, (2) applying a new kinetic isotope fractionation effect for deep waters rather than commonly used isotope effect could only reproduce the observed relationship. Current result suggests the unidentified deep metabolism process, such as complete O2 consumption by diffusion process predominant process for O2 distribution in the mesopelagic waters rather than that in the epipelagic zone.
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Report
(4 results)
Research Products
(4 results)
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[Journal Article] The Sea of Japan and its Unique Chemistry Revealed by Time-Series observations over the Last 30 Years2014
Author(s)
Gamo, T., Nakayama, N, Takahata, N., Sano, Y., Zhang, J., Yamazaki, E., Taniyasu, S. and Yamashita, N.
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Journal Title
Monographs on Environment, Earth and Planets
Volume: 2
Pages: 1-22
NAID
Related Report
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