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Dissolution of silica accompanied by oxygen consumption in the bottom layer of Japan’s central Seto Inland Sea in summer

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Abstract

Distribution of silicic acid (Si(OH)4) in bottom water was investigated in the central Seto Inland Sea under stratified conditions in summer. Water samples were collected at 10 stations on April 24 and 25 and July 7 and 8, 2012. In July, stratification progressed, and a cold water mass (dome) of <20 °C appeared. In response to the cold dome, low oxygen content was observed in the bottom layer of the eastern part of Hiuchi-Nada. In this water mass site, apparent oxygen utilization values calculated from dissolved oxygen (DO) concentrations increased, coinciding with increase of Si(OH)4 concentrations from April to July. This suggests that increase of Si(OH)4 [dissolution of biogenic silica (diatom frustules)] was accompanied by DO consumption due to degradation of organic matter such as plankton soft tissue. These findings suggest that a bacterial degradation of the organic matrix that covers diatom frustules could accelerate the dissolution of biogenic silica in bottom water under stratified conditions.

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Acknowledgments

The authors express their profound appreciation for the assistance with sampling provided by the officers and crew of the R/V Shirafuji-Maru. The authors are also deeply indebted to two anonymous reviewers and the editor of Journal of Oceanography for their kindly provided constructive comments.

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Authors and Affiliations

  1. National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, Hatsukaichi, 739-0452, Japan

    Kazuo Abe, Norihisa Nakagawa, Katsuyuki Abo & Mutsumi Tsujino

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  1. Kazuo Abe
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  2. Norihisa Nakagawa
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  3. Katsuyuki Abo
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  4. Mutsumi Tsujino
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Correspondence to Kazuo Abe.

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Abe, K., Nakagawa, N., Abo, K. et al. Dissolution of silica accompanied by oxygen consumption in the bottom layer of Japan’s central Seto Inland Sea in summer. J Oceanogr 70, 267–276 (2014). https://doi.org/10.1007/s10872-014-0229-5

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  • DOI: https://doi.org/10.1007/s10872-014-0229-5

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