气候变化领域集成服务门户(CCPortal): Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes

CCPortal

DOI	10.1016/j.quascirev.2019.07.036
	Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes
	Rabouille C.; Dennielou B.; Baudin F.; Raimonet M.; Droz L.; Khripounoff A.; Martinez P.; Mejanelle L.; Michalopoulos P.; Pastor L.; Pruski A.; Ragueneau O.; Reyss J.-L.; Ruffine L.; Schnyder J.; Stetten E.; Taillefert M.; Tourolle J.; Olu K.
发表日期	2019
ISSN	0277-3791
卷号	222
英文摘要	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. © 2019 Elsevier Ltd
英文关键词	Inorganic geochemistry; Organic geochemistry; Paleoceanography; Present; Sedimentology-marine cores; South Atlantic
语种	英语
scopus关键词	Geochemistry; Glacial geology; Rivers; Sediments; Silica; Inorganic geochemistries; Marine cores; Organic geochemistry; Paleoceanography; Present; South Atlantic; Organic carbon; atmosphere-ocean system; carbon sink; deep-sea sediment; geochemistry; inorganic compound; long-term change; mass balance; organic compound; paleoceanography; primary production; sedimentology; shallow-water equation; silica; submarine canyon; Atlantic Ocean; Atlantic Ocean (South); Congo River; Gorgonacea
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151765
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA-CNRS-UVSQ 8212 et IPSL, Université Paris-Saclay, Avenue de la Terrasse, Gif sur Yvette, 91190, France; Unité de Recherche Géosciences Marines, IFREMER, Plouzané, 29280, France; Institut des Sciences de la Terre de Paris, Sorbonne Université, CNRS, UMR 7193, 4 Place Jussieu, Paris, 75005, France; Laboratoire des Sciences de l'Environnement Marin, UMR UBO-CNRS, Institut Universitaire Européen de la Mer, Plouzané, 29280, France; Laboratoire Domaines Océaniques, UMR UBO-CNRS6538, Institut Universitaire Européen de la Mer, Plouzané, 29280, France; IFREMER Centre Bretagne, Unité de Recherche Etude des Ecosystèmes Profonds, (REM-EEP-LEP), Plouzané, 29280, France; Environnements et Paléoenvironnements Océaniques et Continentaux, Université de Bordeaux, UMR 5805, Allée Geoffroy St Hilaire, Pessac Cedex, 33615, France; Laboratoire d'Ecogéochimie des Environnements Benthiques, Sorbonne Université, CNRS, UMR 8222, Observatoire Océanologique, Banyuls-su...
推荐引用方式 GB/T 7714	Rabouille C.,Dennielou B.,Baudin F.,et al. Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes[J],2019,222.
APA	Rabouille C..,Dennielou B..,Baudin F..,Raimonet M..,Droz L..,...&Olu K..(2019).Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes.Quaternary Science Reviews,222.
MLA	Rabouille C.,et al."Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes".Quaternary Science Reviews 222(2019).