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Provedor de dados:  5
País:  France
Título:  Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes
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
Data:  2019-10
Ano:  2019
Palavras-chave:  Present
Paleoceanography
South Atlantic
Inorganic geochemistry
Organic geochemistry
Sedimentology-marine cores
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.
Tipo:  Text
Idioma:  Inglês
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/
Editor:  Elsevier BV
Formato:  application/pdf
Fonte:  Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-10 , Vol. 222 , P. 105854 (7p.)
Direitos:  info:eu-repo/semantics/openAccess

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