Variations and Controls of Sulfate Reduction in the Continental Slope and Rise of the Ulleung Basin off the Southeast Korean Upwelling System in the East Sea SCIE SCOPUS

Cited 13 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Variations and Controls of Sulfate Reduction in the Continental Slope and Rise of the Ulleung Basin off the Southeast Korean Upwelling System in the East Sea
Author(s)
Hyun, Jung-Ho; Mok, Jin-Sook; You, Ok-Rye; Kim, Dongseon; Choi, Dong-Lim
KIOST Author(s)
Kim, Dong Seon(김동선)
Publication Year
2010
Abstract
Despite its importance in carbon mineralization pathways, relatively little is known about sulfate reduction along a continental slope and rise. We investigated the temporal and spatial variations and controls of sulfate reduction rates (SRRs) in the continental margin sediment of the Ulleung basin (UB), off the southeast Korean upwelling system in the East Sea. SRRs ranged from 1.22 to 8.07 mmol m-2 d-1 at the slope sites and from 0.69 to 3.18 mmol m-2 d-1 at the basin sites. These values were exceptionally higher than those observed within other marginal seas and were comparable to SRR values at the same depth range in the Peruvian and Chilean upwelling systems. The high sulfate reduction in the UB was attributable to enhanced primary production in the water column associated with coastal upwelling and a high export flux of large organic particles into the basin via the Ulleung warm eddy. The depth integrated SRR was approximately 4 times higher in the highly productive spring (4.91 +/- 2.55 mmol m-2 d-1) than during the summer, which exhibited a stratified water column (1.28 +/- 0.48 mmol m-2 d-1). In the meantime, despite the high organic carbon content ( 2.5% dry wt.) in the UB, the SRR was consistently suppressed in the Mn oxide-enriched (174 mol cm-3) surface sediments of the continental rise. Overall, these results indicate that the production of organic carbon in the water column and its subsequent deposition on the seafloor is the primary source controlling the temporal variability of sulfate reduction, whereas the Mn oxides that were enriched in the basin are responsible for the spatial variability of the SRR in the UB. Carbon oxidation in the UB accounted for approximately 30% of primary production and approximately 60% of the export flux, indicating that the continental slope and rise of the UB is a region of rapid organic carbon turnover and nutrient regeneration.
ISSN
0149-0451
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4152
DOI
10.1080/01490450903456731
Bibliographic Citation
GEOMICROBIOLOGY JOURNAL, v.27, no.2, pp.212 - 222, 2010
Publisher
TAYLOR & FRANCIS INC
Subject
PARTICULATE ORGANIC-CARBON; SOUTHWESTERN EAST/JAPAN SEA; DEEP SARGASSO SEA; TH-234/U-238 DISEQUILIBRIUM; MARGIN SEDIMENTS; NORTH PACIFIC; EXPORT FLUX; SURFACE SEDIMENTS; MARINE-SEDIMENTS; CENTRAL CHILE
Keywords
continental slope and rise; East Sea; Fe oxide; Japan Sea; Mn oxide; sulfate reduction; Ulleung basin; upwelling
Type
Article
Language
English
Document Type
Article; Proceedings Paper
Publisher
TAYLOR & FRANCIS INC
Related Researcher
Research Interests

Biogeochemistry,Carbon cycle,Ocean acidification,생지화학,탄소순환,해양산성화

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