Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean)
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/16770 |
Resumo: | Physical 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. |
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Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean)DiatomsSea iceMarginal ice zoneCarbon exportBiogenic siliconScotia seaSouthern oceanCorethron pennatumPhysical 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.CTM2009-08287-E/ANT, CTM2011-14056E/ANT, SGR 315 2017Frontiers Media SASapientiaZúñiga, D.Sanchez-Vidal, A.Flexas, M. M.Carroll, D.Rufino, M. M.Spreen, G.Calafat, A.Abrantes, F.2021-07-13T10:49:59Z2021-062021-06-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/16770eng10.3389/feart.2021.5791982296-6463info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:28:45Zoai:sapientia.ualg.pt:10400.1/16770Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:06:50.076964Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
title |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
spellingShingle |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) Zúñiga, D. Diatoms Sea ice Marginal ice zone Carbon export Biogenic silicon Scotia sea Southern ocean Corethron pennatum |
title_short |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
title_full |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
title_fullStr |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
title_full_unstemmed |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
title_sort |
Sinking diatom assemblages as a key driver for deep carbon and silicon export in the Scotia Sea (Southern Ocean) |
author |
Zúñiga, D. |
author_facet |
Zúñiga, D. Sanchez-Vidal, A. Flexas, M. M. Carroll, D. Rufino, M. M. Spreen, G. Calafat, A. Abrantes, F. |
author_role |
author |
author2 |
Sanchez-Vidal, A. Flexas, M. M. Carroll, D. Rufino, M. M. Spreen, G. Calafat, A. Abrantes, F. |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Zúñiga, D. Sanchez-Vidal, A. Flexas, M. M. Carroll, D. Rufino, M. M. Spreen, G. Calafat, A. Abrantes, F. |
dc.subject.por.fl_str_mv |
Diatoms Sea ice Marginal ice zone Carbon export Biogenic silicon Scotia sea Southern ocean Corethron pennatum |
topic |
Diatoms Sea ice Marginal ice zone Carbon export Biogenic silicon Scotia sea Southern ocean Corethron pennatum |
description |
Physical 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. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-07-13T10:49:59Z 2021-06 2021-06-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/16770 |
url |
http://hdl.handle.net/10400.1/16770 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.3389/feart.2021.579198 2296-6463 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Frontiers Media SA |
publisher.none.fl_str_mv |
Frontiers Media SA |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133312206241792 |