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Estimation of Oxygen Consumption Rate and Organic Carbon Oxidation Rate at the Sediment/Water Interface of Coastal Sediments in the South Sea of Korea using an Oxygen Microsensor  

Lee, Jae-Seon (South Sea Fisheries Research Institute, NFRDI)
Kim, Kee-Hyun (Department of Oceanography, Chungnam National University)
Yu, Jun (South Sea Fisheries Research Institute, NFRDI)
Jung, Rae-Hong (South Sea Fisheries Research Institute, NFRDI)
Ko, Tae-Seung (South Sea Fisheries Research Institute, NFRDI)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.8, no.4, 2003 , pp. 392-400 More about this Journal
Abstract
We used an oxygen microelectrode to measure the vertical profiles of oxygen concentration in sediments located near point sources of organic matter. The measurements were carried out between 13th and 17th May, 2003, in semi-closed bay and coastal sediments in the central part of the South Sea. The measured oxygen penetration depths were extremely shallow and ranged from 1.30 to 3.80 mm. This suggested that the oxidation and reduction reactions in the early diagenesis should be studied at the mm depth scale. In order to estimate the oxygen consumption rate, we applied the one-dimension diffusion-reaction model to vertical profiles of oxygen near the sediment/water interface. Oxygen consumption rates were estimated to be between 10.8 and 27.6 mmol O$_2$ m$\^$-2/ day$\^$-1/(average: 19.1 mmol O$_2$ m$\^$-2/ day$\^$-1/). These rates showed a positive correlation with the organic carbon of the sediments. The corresponding benthic organic carbon oxidation rates calculated using an modified Redfield ratio (170/110) at the sediment/water interface were in the range of 89.5-228.1 mg C m$\^$-2/ day$\^$-1/(average: 158.0 mg C m$\^$-2/ day$\^$-1/). We suggest that these results are maximum values at the presents situation in the bay because the sampling sites were located near point sources of organic materials. This study will need to be carried out at many coastal sites and throughout the seasons to allow an understanding of the mechanisms of eutrophication e.g. the spatial distribution of oxygen consumption within the oxic zone and hypoxic conditions in the coastal sea.
Keywords
Early Diagenesis; Oxygen Consumption Rate; Benthic Organic Carbon Oxidation Rate; Hypoxic Condition;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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