| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes
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| Autores: |
Rabouille, C.
Dennielou, Bernard
Baudin, F.
Raimonet, M.
Droz, Laurence
Khripounoff, Alexis
Martinez, P.
Mejanelle, L.
Michalopoulos, P.
Pastor, Lucie
Pruski, A.
Ragueneau, Olivier
Reyss, J.-l.
Ruffine, Livio
Schnyder, J.
Stetten, E.
Taillefert, M.
Tourolle, Julie
Olu, Karine
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| Data: |
2019-10
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| Ano: |
2019
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| Palavras-chave: |
Present
Paleoceanography
South Atlantic
Inorganic geochemistry
Organic geochemistry
Sedimentology-marine cores
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| Resumo: |
Carbon and silicon cycles at the Earth surface are linked to long-term variations of atmospheric CO2 and oceanic primary production. In these cycles, the river-sea interface is considered a biogeochemical hotspot, and deltas presently receive and preserve a major fraction of riverine particles in shallow water sediments. In contrast, periods of glacial maximum lowstand were characterized by massive exports of sediments to the deep-sea via submarine canyons and accumulation in deep-sea fans. Here, we calculate present-day mass balances for organic carbon (OC) and amorphous silica (aSi) in the terminal lobe complex of the Congo River deep-sea fan as an analogue for glacial periods. We show that this lobe complex constitutes a megasink with the current accumulation of 18 and 35% of the OC and aSi river input, respectively. This increases the estimates of organic carbon burial by 19% in the South Atlantic Ocean in a zone representing less than 0.01% of the basin. These megasinks might have played a role in carbon trapping in oceanic sediments during glacial times.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00511/62289/66720.pdf
DOI:10.1016/j.quascirev.2019.07.036
https://archimer.ifremer.fr/doc/00511/62289/
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| Editor: |
Elsevier BV
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| Formato: |
application/pdf
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| Fonte: |
Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-10 , Vol. 222 , P. 105854 (7p.)
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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