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Photochemical Degradation of Dissolved Organic Carbon to Carbon Monoxide in Coastal Seawater

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Dynamics and Characterization of Marine Organic Matter

Part of the book series: Ocean Sciences Research (OSR) ((OCRE,volume 2))

Abstract

Carbon Monoxide concentrations in the Seto Inland Sea (Stns. 3 and 6) and Ise Bay (Sugashima) were measured by the headspace method during the 95-1 cruise of the R/V Toyoshio Maru (Hiroshima University) and at the Sugashima Marine Laboratory (Nagoya University), respectively.

The vertical distribution of CO concentrations displayed a marked diurnal variation in sunlit water layers (photochemical depths), i.e., 0–10 m at Stn. 3, 0–20 m at Stn. 6, and 0–3 m at Sugashima. The sea-to-air CO fluxes were estimated to be 2–11 μmole/m2/d at these observation sites. The CO concentrations in the photochemical depth were integrated to give a CO column burden. Diurnal variations in the CO column burden were analyzed for daily oxidation and production rates of CO in water. Carbon monoxide in water was suggested to be rapidly oxidized by high microbial activities, showing the turnover times of 2–3 h in the Seto Inland Sea and 2 h at Sugashima. The CO production rates estimated were 0.16 (Stn. 3), 0.63 (Stn. 6) and 0.28 (Sugashima) mmole C/m2/d.

On the basis of daily CO production rates and DOC concentrations in water, the lifetimes of DOC were estimated to be 19, 10 and 5 yr at Stns. 3 and 6 and Sugashima, respectively. These values which were obtained for the first time for coastal oceanic DOC are about two order of magnitude as small as those reported for DOC in the Sargasso Sea (500–2100 yr).

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Authors and Affiliations

  1. Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Nagoya, 464-01, Japan

    Keiichi Ohta, Atsushi Sano & Koichi Sugimura

  2. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-01, Japan

    Yayoi Inomata

Authors
  1. Keiichi Ohta
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  2. Yayoi Inomata
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  3. Atsushi Sano
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  4. Koichi Sugimura
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Editors and Affiliations

  1. Faculty of Information Science and Technology, Aichi Prefectural University, Aichi-gun, Japan

    Nobuhiko Handa

  2. Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Nagoya, Japan

    Eiichiro Tanoue

  3. Institute of Biological Sciences, Tsukuba University, Tsukuba, Japan

    Takeo Hama

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© 2000 Springer Science+Business Media Dordrecht

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Ohta, K., Inomata, Y., Sano, A., Sugimura, K. (2000). Photochemical Degradation of Dissolved Organic Carbon to Carbon Monoxide in Coastal Seawater. In: Handa, N., Tanoue, E., Hama, T. (eds) Dynamics and Characterization of Marine Organic Matter. Ocean Sciences Research (OSR), vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1319-1_10

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  • DOI: https://doi.org/10.1007/978-94-017-1319-1_10

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-5451-7

  • Online ISBN: 978-94-017-1319-1

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