| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Planktic foraminifer and coccolith contribution to carbonate export fluxes over the central Kerguelen Plateau
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| Autores: |
Rembauville, M.
Meilland, J.
Ziveri, P.
Schiebel, R.
Blain, S.
Salter, I.
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| Data: |
2016-05
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| Ano: |
2016
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| Palavras-chave: |
Foraminifer
Coccoliths
Export
Carbonate counter-pump
Kerguelen Plateau
Southern Ocean
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| Resumo: |
We report the contribution of planktic foraminifers and coccoliths to the particulate inorganic carbon (PIC) export fluxes collected over an annual cycle (October 2011/September 2012) on the central Kerguelen Plateau in the Antarctic Zone (AAZ) south of the Polar Front (PF). The seasonality of PIC flux was decoupled from surface chlorophyll a concentration and particulate organic carbon (POC) fluxes and was characterized by a late summer (February) maximum. This peak was concomitant with the highest satellite-derived sea surface PIC and corresponded to a Emiliania huxleyi coccoliths export event that accounted for 85% of the annual PIC export. The foraminifer contribution to the annual PIC flux was much lower (15%) and dominated by Turborotalita quinqueloba and Neogloboquadrina pachyderma. Foraminifer export fluxes were closely related to the surface chlorophyll a concentration, suggesting food availability as an important factor regulating the foraminifer's biomass. We compared size-normalized test weight (SNW) of the foraminifers with previously published SNW from the Crozet Islands using the same methodology and found no significant difference in SNW between sites for a given species. However, the SNW was significantly species-specific with a threefold increase from T quinqueloba to Globigerina bulloides. The annual PIC:POC molar ratio of 0.07 was close to the mean ratio for the global ocean and lead to a low carbonate counter pump effect (similar to 5%) compared to a previous study north of the PF (6-32%). We suggest that lowers counter pump effect south of the PF despite similar productivity levels is due to a dominance of coccoliths in the PIC fluxes and a difference in the foraminifers species assemblage with a predominance of polar species with lower SNW.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00421/53249/54722.pdf
DOI:10.1016/j.dsr.2016.02.017
https://archimer.ifremer.fr/doc/00421/53249/
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| Editor: |
Pergamon-elsevier Science Ltd
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| Formato: |
application/pdf
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| Fonte: |
Deep-sea Research Part I-oceanographic Research Papers (0967-0637) (Pergamon-elsevier Science Ltd), 2016-05 , Vol. 111 , P. 91-101
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| Direitos: |
2016 Elsevier Ltd. All rights reserved.
info:eu-repo/semantics/openAccess
restricted use
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