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	Provedor de dados ArchiMer (2) Autor Adkins, Jess F. (1) Arthur, Kristina (1) Biastoch, Arne (1) Burke, Andrea (1) Caley, Thibaut (1) Durgadoo, Jonathan (1) Ferrari, Raffaele (1) Giraudeau, Jacques (1) Jansen, Malte F. (1) Malaize, Bruno (1) Peeters, Frank J. C. (1) Rossignol, Linda (1) Stewart, Andrew L. (1) Thompson, Andrew F. (1) Van Sebille, Erik (1) Zahn, Rainer (1) Mais... Palavra-chave Overturning circulation (2) Last Glacial Maximum (1) Numerical ocean model (1) Planktic foraminiferal (1) Quantitative palaeo Agulhas leakage (1) Radiocarbon (1) Mais... Tipo do documento Text (2) Ano 2015 (1) 2014 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última The glacial mid-depth radiocarbon bulge and its implications for the overturning circulation ArchiMer Burke, Andrea; Stewart, Andrew L.; Adkins, Jess F.; Ferrari, Raffaele; Jansen, Malte F.; Thompson, Andrew F.. Published reconstructions of radiocarbon in the Atlantic sector of the Southern Ocean indicate that there is amid-depth maximum in radiocarbon age during the Last Glacial Maximum (LGM). This is in contrast to the modern ocean where intense mixing between water masses results in a relatively homogenous radiocarbon profile. Ferrari et al. (2014) suggested that the extended Antarctic sea ice cover during the LGM necessitated a shallower boundary between the upper and lower branches of the meridional overturning circulation. This shoaled boundary lay above major topographic features associated with strong diapycnal mixing, isolating dense southern sourced water in the lower branch of the overturning circulation. This isolation would have allowed radiocarbon to... Tipo: Text Palavras-chave: Radiocarbon; Overturning circulation; Last Glacial Maximum. Ano: 2015 URL: https://archimer.ifremer.fr/doc/00497/60855/64245.pdf Quantitative estimate of the paleo-Agulhas leakage ArchiMer Caley, Thibaut; Peeters, Frank J. C.; Biastoch, Arne; Rossignol, Linda; Van Sebille, Erik; Durgadoo, Jonathan; Malaize, Bruno; Giraudeau, Jacques; Arthur, Kristina; Zahn, Rainer. The Indian-Atlantic water exchange south of Africa (Agulhas leakage) is a key component of the global ocean circulation. No quantitative estimation of the paleo-Agulhas leakage exists. We quantify the variability in interocean exchange over the past 640,000 years, using planktic foraminiferal assemblage data from two marine sediment records to define an Agulhas leakage efficiency index. We confirm the validity of our new approach with a numerical ocean model that realistically simulates the modern Agulhas leakage changes. Our results suggest that, during the past several glacial-interglacial cycles, the Agulhas leakage varied by ~10 sverdrup and more during major climatic transitions. This lends strong credence to the hypothesis that modifications in the... Tipo: Text Palavras-chave: Quantitative palaeo Agulhas leakage; Planktic foraminiferal; Numerical ocean model; Overturning circulation. Ano: 2014 URL: https://archimer.ifremer.fr/doc/00291/40172/39028.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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