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Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean)

2021-06Journal article Open access
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dc.contributor.authorZúñiga, D.
dc.contributor.authorSanchez-Vidal, A.
dc.contributor.authorFlexas, M. M.
dc.contributor.authorCarroll, D.
dc.contributor.authorRufino, M. M.
dc.contributor.authorSpreen, G.
dc.contributor.authorCalafat, A.
dc.contributor.authorAbrantes, F.
dc.date.accessioned2021-07-13T10:49:59Z
dc.date.available2021-07-13T10:49:59Z
dc.date.issued2021-06
dc.description.abstractPhysical and biogeochemical processes in the Southern Ocean are fundamental for modulating global climate. In this context, a process-based understanding of how Antarctic diatoms control primary production and carbon export, and hence global ocean carbon sequestration, has been identified as a scientific priority. Here we use novel sediment trap observations in combination with a data-assimilative ocean biogeochemistry model (ECCO-Darwin) to understand how environmental conditions trigger diatom ecology in the iron-fertilized southern Scotia Sea. We unravel the role of diatoms assemblage in controlling the biogeochemistry of sinking material escaping from the euphotic zone, and discuss the link between changes in upper-ocean environmental conditions and the composition of settling material exported from the surface to 1,000 m depth from March 2012 to January 2013. The combined analysis of in situ observations and model simulation suggests that an anomalous sea-ice episode in early summer 2012–2013 favored (via restratification due to sea-ice melt) an early massive bloom of Corethron pennatum that rapidly sank to depth. This event drove high biogenic silicon to organic carbon export ratios, while modulating the carbon and nitrogen isotopic signals of sinking organic matter reaching the deep ocean. Our findings highlight the role of diatom ecology in modulating silicon vs. carbon sequestration efficiency, a critical factor for determining the stoichiometric relationship of limiting nutrients in the Southern Ocean.pt_PT
dc.description.sponsorshipCTM2009-08287-E/ANT, CTM2011-14056E/ANT, SGR 315 2017pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/feart.2021.579198pt_PT
dc.identifier.eissn2296-6463
dc.identifier.urihttp://hdl.handle.net/10400.1/16770
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Media SApt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectDiatomspt_PT
dc.subjectSea icept_PT
dc.subjectMarginal ice zonept_PT
dc.subjectCarbon exportpt_PT
dc.subjectBiogenic siliconpt_PT
dc.subjectScotia seapt_PT
dc.subjectSouthern oceanpt_PT
dc.subjectCorethron pennatumpt_PT
dc.titleSinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleFrontiers in Earth Sciencept_PT
oaire.citation.volume9pt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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