Organic carbon accumulation and sulfate reduction rates in slope and basin sediments of the Ulleung Basin,East/Japan Sea |
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Authors: | Taehee?Lee Jung-Ho?Hyun Jin?Sook?Mok Email author" target="_blank">Dongseon?KimEmail author |
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Institution: | (1) Southern Coastal Environment Research Department, KORDI, Geoje, 656-830, South Korea;(2) Department of Environmental Maine Sciences, Hanyang University, Ansan, 426-791, South Korea;(3) Marine Environment Research Department, KORDI, Ansan, P.O. Box 29, Seoul, 425-600, South Korea |
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Abstract: | This study investigated the organic carbon accumulation rates (OCARs) and sulfate reduction rates (SRRs) in slope and basin
sediments of the Ulleung Basin, East/Japan Sea. These sediments have high organic contents at depths greater than 2,000 m;
this is rare for deep-sea sediments, except for those of the Black Sea and Chilean upwelling regions. The mean organic carbon
to total nitrogen molar ratio was estimated to be 6.98 in the Ulleung Basin sediments, indicating that the organic matter
is predominantly of marine origin. Strong organic carbon enrichment in the Ulleung Basin appears to result from high export
production, and low dilution by inputs of terrestrial materials and calcium carbonate. Apparent sedimentation rates, calculated
primarily from excess 210Pb distribution below the zone of sediment mixing, varied from 0.033 to 0.116 cm year−1, agreeing well with previous results for the basin. OCARs fluctuated strongly in the range of 2.06–12.5 g C m−2 year−1, these rates being four times higher at the slope sites than at the basin sites. Within the top 15 cm of the sediment, the
integrated SRRs ranged from 0.72 to 1.89 mmol m−2 day−1, with rates approximately twice as high in the slope areas as in the basin areas. SRR values were consistently higher in
areas of high sedimentation and of high organic carbon accumulation, correlating well with apparent sedimentation rates and
OCARs. The sulfate reduction rates recorded in the basin and slope sediments of the Ulleung Basin are higher than those reported
for other parts of the world, with the exception of the Peruvian and Chilean upwelling regions. This is consistent with the
high organic carbon contents of surface sediments of the Ulleung Basin, suggesting enhanced organic matter fluxes. |
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