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Low benthic respiration and nutrient flux at the highly productive Amundsen Sea Polynya, Antarctica

Cited 10 time in wos
Cited 12 time in scopus

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DC Field Value Language
dc.contributor.authorKim, Sung-Han-
dc.contributor.authorChoi, Ayeon-
dc.contributor.authorYang, Eun Jin-
dc.contributor.authorLee, SangHoon-
dc.contributor.authorHyun, Jung-Ho-
dc.coverage.spatialAmundsen Sea-
dc.coverage.spatialAmundsen Sea Polynya-
dc.coverage.spatialAntarctica-
dc.date.accessioned2017-08-03T14:09:57Z-
dc.date.available2017-08-03T14:09:57Z-
dc.date.issued2016-
dc.description.abstractWe investigated rates of total oxygen uptake (TOU) sulfate reduction (SRR), and benthic nutrient flux (BNF) in sediments of polynya (730-825 m water depth), ice shelf (1064 m water depth), and marginal sea-ice zone (530 m water depth) to evaluate the role of benthic mineralization in degrading organic material produced by primary production in the Amundsen Sea polynya (ASP), Antarctica. Despite high primary production (110 mmol C m<sup>-2</sup> d<sup>-1</sup>) in the water column, benthic carbon mineralization in the ASP (average, 2.1±0.3 mmol C m<sup>-2</sup> d<sup>-1</sup>) was strikingly lower than in other less productive polar regions, accounting for only 1.9% of primary production. Low sediment accumulation rates (0.18-0.20 cm yr<sup>-1</sup>) and sinking fluxes of organic matter likely caused the low oxygen consumption rates (2.44-3.11 mmol m<sup>-2 </sup>d</sup>1<sup>) and low effluxes of dissolved inorganic nitrogen (0.12-0.13 mmol m<sup>-2</sup> d<sup>-1</sup>) and phosphate (0.017-0.018 mmol m<sup>-2</sup> d-1) in the ASP. Carbon oxidation by sulfate reduction (0.11-0.19 mmol Cm<sup>-2</sup> d</sup>-1<sup>) comprised only 10% of total benthic mineralization, indicating that anaerobic C oxidation plays a minor role in total C oxidation. Our results, including low sediment accumulation rates and benthic metabolic rates, suggest that most organic carbon produced by <em>Phaeocystis</em> blooms would be respired to CO<sub>2</sub> in the water column, and thus the organic carbon reaching the sediment is not adequate to stimulate benthic metabolism in the ASP.-
dc.languageEnglish-
dc.subjectOceanography-
dc.subject.classificationAraon-
dc.titleLow benthic respiration and nutrient flux at the highly productive Amundsen Sea Polynya, Antarctica-
dc.typeArticle-
dc.identifier.bibliographicCitationKim, Sung-Han, et al. 2016. "Low benthic respiration and nutrient flux at the highly productive Amundsen Sea Polynya, Antarctica". <em>Deep-Sea ResearchII</em>, 123(1): 92-101.-
dc.citation.titleDeep-Sea ResearchII-
dc.citation.volume123-
dc.citation.number1-
dc.citation.page92-101.-
dc.identifier.doi10.1016/j.dsr2.2015.10.004-
dc.coverage.x73.250°S-
dc.coverage.x73.496°S-
dc.coverage.x74.202°S-
dc.coverage.x71.699°S-
dc.coverage.y114.997°W-
dc.coverage.y114.008°W-
dc.coverage.y112.51°W-
dc.coverage.y114.037 °W-
dc.coverage.z825m-
dc.coverage.z730m-
dc.coverage.z1064m-
dc.coverage.z530m-
dc.subject.keywordTotal oxygen uptake-
dc.subject.keywordSulfate reductionrate-
dc.subject.keywordBenthic nutrient flux-
dc.subject.keywordAmundsen Sea Polynya-
dc.subject.keywordAntarctica-
dc.subject.keywordAraon-
dc.coverage.degreeX-73.25-
dc.coverage.degreeX-73.496-
dc.coverage.degreeX-74.202-
dc.coverage.degreeX-71.699-
dc.coverage.degreeY-114.997-
dc.coverage.degreeY-114.008-
dc.coverage.degreeY-112.51-
dc.coverage.degreeY-114.037-
dc.identifier.scopusid2-s2.0-84958115184-
dc.identifier.wosid000370885500011-
Appears in Collections  
2014-2016, Physical and Bio-Geochemical Processes in the Amundsen Sea / Lee; Sang H. (PP15020; PP16020; PP14020)
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