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dc.contributor.author김성한-
dc.date.accessioned2018-06-11T08:26:08Z-
dc.date.available2018-06-11T08:26:08Z-
dc.date.issued2017-03-
dc.identifier.citationBiogeosciences, v. 14, No. 4, Page. 941-958en_US
dc.identifier.issn1726-4170-
dc.identifier.issn1726-4189-
dc.identifier.urihttp://findresearcher.sdu.dk:8080/portal/en/publications/id(dd20e4ee-1743-4ccf-bd14-79240b936b51).html-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/72005-
dc.description.abstractRates and pathways of benthic organic carbon (Corg) oxidation were investigated in surface sediments of the Ulleung Basin (UB) characterized by high Corg contents (˃ 2.5 %, dry wt.) and very high contents of Mn oxides (˃ 200 mu mol cm(-3)) and Fe oxides (up to 100 mu mol cm(-3)). The combination of geochemical analyses and independently executed metabolic rate measurements revealed that Mn and Fe reduction were the dominant Corg oxidation pathways in the center of the UB, comprising 45 and 20% of total Corg oxidation, respectively. By contrast, sulfate reduction was the dominant Corg oxidation pathway, accounting for 50% of total Corg mineralization in sediments of the continental slope. The relative significance of each Corg oxidation pathway matched the depth distribution of the respective electron acceptors. The relative importance of Mn reduction for Corg oxidation displays saturation kinetics with respect to Mn oxide content with a low half-saturation value of 8.6 mu mol cm(-3), which further implies that Mn reduction can be a dominant Corg oxidation process even in sediments with lower MnO2 content as known from several other locations. This is the first report of a high contribution of manganese reduction to Corg oxidation in offshore sediments on the Asian margin. The high manganese oxide content in the surface sediment in the central UB was maintained by an extreme degree of recycling, with each Mn atom on average being reoxidized similar to 3800 times before permanent burial. This is the highest degree of recycling so far reported for Mn-rich sediments, and it appears linked to the high benthic mineralization rates resulting from the high Corg content that indicate the UB as a biogeochemical hotspot for turnover of organic matter and nutrient regeneration.en_US
dc.description.sponsorshipThis research was a part of the projects titled Korean Long-term Marine Ecological Researches (K-LTMER) and Deep Water Circulation and Material Cycling in the East Sea (EAST-II) funded by the Korean Ministry of Oceans and Fisheries, and was also supported by the National Research Foundation of Korea (NRF-2012-013-2012S1A2A1A01030760) in collaboration with the Danish Council for Independent Research and the Danish National Research Foundation (DNRF53). The authors thank S. Pantoja (handling editor), S. Kasten and the two anonymous reviewers for their comments that improved the earlier version of the manuscript.en_US
dc.language.isoen_USen_US
dc.publisherEuropean Geosciences Union (EGU).en_US
dc.subjectCONTINENTAL-MARGIN SEDIMENTSen_US
dc.subjectBACTERIAL SULFATE REDUCTIONen_US
dc.subjectCLIPPERTON FRACTURE-ZONEen_US
dc.subjectCOASTAL MARINE-SEDIMENTSen_US
dc.subjectACID VOLATILE SULFIDEen_US
dc.subjectSALT-MARSH SEDIMENTSen_US
dc.subjectMATTER MINERALIZATIONen_US
dc.subjectEAST SEAen_US
dc.subjectHEMIPELAGIC SEDIMENTSen_US
dc.titleManganese and iron reduction dominate organic carbon oxidation in surface sediments of the deep Ulleung Basin, East Seaen_US
dc.typeArticleen_US
dc.relation.no4-
dc.relation.volume14-
dc.identifier.doi10.5194/bg-14-941-2017-
dc.relation.page941-958-
dc.relation.journalBiogeosciences-
dc.contributor.googleauthorHyun, Jung-Ho-
dc.contributor.googleauthorKim, Sung-Han-
dc.contributor.googleauthorMok, Jin-Sook-
dc.contributor.googleauthorCho, Hyeyoun-
dc.contributor.googleauthorLee, Tongsup-
dc.contributor.googleauthorVandieken, Verona-
dc.contributor.googleauthorThamdrup, Bo-
dc.relation.code2017022561-
dc.sector.campusE-
dc.sector.daehakRESEARCH INSTITUTE[E]-
dc.sector.departmentINSTITUTE OF OCENA AND ATMOSPHERIC SCIENCES-
dc.identifier.pidshkim1778-
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