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	Provedor de dados ArchiMer (2) Autor Hillaire-marcel, C (2) Brasseur, R (1) De Vernal, A (1) Fagel, N (1) Humblet, M (1) Peltier, Wr (1) Stevenson, R (1) Weaver, Aj (1) Weis, D (1) Mais... Palavra-chave North Atlantic (2) Clay-size fraction (1) Deep circulation (1) Density (1) LGM (1) Labrador Sea (1) Last Glacial Maximum (1) Nd and Pb isotopes (1) Pycnocline (1) Salinity (1) Sedimentary mixings (1) Mais... Tipo do documento Text (2) Ano 2004 (1) 2002 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern ArchiMer Fagel, N; Hillaire-marcel, C; Humblet, M; Brasseur, R; Weis, D; Stevenson, R. Nd and Pb isotopes were measured on the fine fraction of one sediment core drilled off southern Greenland. This work aims to reconstruct the evolution of deep circulation patterns in the North Atlantic during the Holocene on the basis of sediment supply variations. For the last 12 kyr, three sources have contributed to the sediment mixture: the North American Shield, the Pan-African and Variscan crusts, and the Mid-Atlantic Ridge. Clay isotope signatures indicate two mixtures of sediment sources. The first mixture (12.2-6.5 ka) is composed of material derived from the North American shield and from a "young'' crustal source. From 6.5 ka onward the mixture is characterized by a young crustal component and by a volcanic component characteristic of the... Tipo: Text Palavras-chave: Clay-size fraction; Sedimentary mixings; Deep circulation; Nd and Pb isotopes; North Atlantic; Labrador Sea. Ano: 2004 URL: https://archimer.ifremer.fr/doc/00226/33731/32199.pdf Structure of the upper water column in the northwest North Atlantic: Modern versus last glacial maximum conditions ArchiMer De Vernal, A; Hillaire-marcel, C; Peltier, Wr; Weaver, Aj. During the Last Glacial Maximum, the northwestern North Atlantic constituted a major conduit for Labrador and Greenland ice sheet meltwaters. Vertical density gradients in its upper water masses have been reconstructed by combining information from transfer functions based on dinocysts and from oxygen isotope measurements (delta(18)O) in planktonic foraminifera. Transfer functions yield temperature and salinity and thus potential density (sigma(theta)) for the warmest (August) and coldest (February) months in the photic zone. The delta(18)O values in different size fractions of epipelagic (Globigerina bulloides) and mesopelagic (Neogloboquadrina pachyderma left-coiled (Np1)) foraminifera allow us to assess sigma(theta) gradients through the pycnocline... Tipo: Text Palavras-chave: Last Glacial Maximum; LGM; North Atlantic; Salinity; Density; Pycnocline. Ano: 2002 URL: https://archimer.ifremer.fr/doc/00223/33405/31861.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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