Consumption of dissolved oxygen in the deep Japan Sea, giving a precise isotopic fractionation factor

Mathematics – Logic

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Oceanography: Biological And Chemical: Geochemistry, Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Geochemistry: Stable Isotope Geochemistry (0454, 4870), Oceanography: Biological And Chemical: Marine Inorganic Chemistry (1050), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041)

Scientific paper

Concentrations and stable isotopic compositions (δ 18O) of dissolved O2 in samples collected in May 2005 from the eastern Japan Sea were measured. The O2 consumption rate and the isotopic fractionation factor (α r ) during dissolved O2 consumption were obtained from the field observations by applying a simple model to the deep water. The in-situ O2 consumption rates were calculated from the apparent O2 utilization and the turnover time of deep water obtained in the previous tracer studies. The rates were 1.2-1.4 μmol kg-1 yr-1 in the deep water below 2000 m. The α r estimated was 0.9875 +/- 0.0003 applying a Rayleigh distillation equation to the quasi-deep water mass of 298-3584 m. The estimated α r and the turnover time mean that δ 18O of dissolved O2 will increase with a rate of 0.05-0.06‰ yr-1 for the closed Japan Sea deep water mass.

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