Consulta: creatorFacets:"Turon, Jean-louis"
Registros recuperados: 9
Data/hora: 27/07/2024 02:51:58

A 27 kyr terrestrial biomarker record in the southern Indian Ocean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sicre, Marie-alexandrine; Labeyrie, Laurent; Ezat, Ullah; Mazaud, Alain; Turon, Jean-louis.
Terrestrial inputs were reconstructed using high molecular weight n-alkane concentrations recorded in the sub-Antarctic Indian Ocean core MD94-103 (45 degrees 35'S, 86 degrees 31'E, 3560 m) to examine regional changes in the atmospheric circulation over the last 27 kyr. This record was compared to the dust content of EPICA-Dome C ice and continental data from South Africa ( e. g., pollen sequences and isotope records in speleothems) to get a comprehensive understanding of atmospheric links between low and midlatitudes of the Indian Ocean. Terrestrial n-alkanes indicate higher glacial than Holocene inputs and marked glacial oscillations. Minimum values during the Last Glacial Maximum (LGM) are consistent with colder and drier climate and presumably caused...
Tipo: Text
Palavras-chave: Biomarker; Glacial; Indian Ocean; Marine sediments; Paleoclimate; Terrestrial.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34547/33355.pdf

MD141 – ALIÉNOR. Rapport scientifique à bord du Marion Dufresne II
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Turon, Jean-louis; Bourillet, Jean-francois; Delpeint, Arnaud; Simplet, Laure.
ALIENOR (A LIsbon-El Ferréol cruise. A support for North Oriental Atlantic Research) est l’intégration, dans une même campagne, de 4 projets situés sur la route du navire entre Lisbonne et Cardiff (leg 1) puis entre Cardiff et El Ferreol (leg 2). o PRIMAROSA (Paleoclimatic Research from Mediterranean Atlantic Record. Overflow Sedimentary Activity) projet de l’université de Bordeaux proposé par Jean-Louis TURON dont la première partie a été réalisée lors de la mission PRIVILEGE entre Malte et Lisbonne (Mai-Juin 2004). o SEQUOIA (Sequencing Ocean-Ice Interaction) financé par le NERC (Nature Environnement Research Council) et proposé par Ian HALL, principal investigateur. o ORSANE Oceanographic Record in the Sunart loch (Atlantic North East) présenté par...
Tipo: Text
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00257/36809/35445.pdf

New constraints on European glacial freshwater releases to the North Atlantic Ocean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Eynaud, Frederique; Malaize, Bruno; Zaragosi, Sebastien; De Vernal, Anne; Scourse, James; Pujol, Claude; Cortijo, Elsa; Grousset, Francis E.; Penaud, Aurelie; Toucanne, Samuel; Turon, Jean-louis; Auffret, Gerard.
During the late Quaternary, both external and internal forcings have driven major climatic shifts from glacial to interglacial conditions. Nonlinear climatic steps characterized the transitions leading to these extrema, with intermediate excursions particularly well expressed in the dynamics of the Northern Hemisphere cryosphere. Here we document the impact of these dynamics on the north-eastern North Atlantic Ocean, focussing on the 35-10 ka interval. Sea-surface salinities have been reconstructed quantitatively based on two independent methods from core MD95-2002, recovered from the northern Bay of Biscay adjacent to the axis of the Manche paleoriver outlet and thus in connection with proximal European ice sheets and glaciers. Quantitative...
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00086/19762/20100.pdf

North-south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Magny, Michel; Combourieu Nebout, Nathalie; De Beaulieu, Jacques-louis; Bout-roumazeilles, Viviane; Colombaroli, D.; Desprat, Stephanie; Francke, A.; Joannin, Sebastien; Ortu, Elena; Peyron, Odile; Revel, Marie; Sadori, Laura; Siani, Giuseppe; Sicre, Marie-alexandrine; Samartin, S.; Simonneau, A.; Tinner, Willy; Vanniere, Boris; Wagner, B.; Zanchetta, Giovanni; Anselmetti, Flavio S.; Brugiapaglia, E.; Chapron, Emmanuel; Debret, Maxime; Desmet, Marc; Didier, Jean; Essallami, Latifa; Galop, D.; Gilli, A.; Haas, J.n.; Kallel, Nejib; Millet, L.; Stock, Andy; Turon, Jean-louis; Wirth, S.
On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north-south transect, data collected in the central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and temporal coherency. Contrasting patterns of palaeohydrological changes have been evidenced in the central Mediterranean: south (north) of around 40 degrees N of latitude, the middle part of the Holocene was characterised by lake-level maxima (minima), during an interval dated to ca. 10 300-4500 cal BP to the south and 9000-4500 cal BP to the north. Available data suggest that these contrasting palaeohydrological...
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37570/36902.pdf

Palaeohydrological changes over the last 50 ky in the central Gulf of Cadiz: complex forcing mechanisms mixing multi-scale processes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Penaud, Aurelie; Eynaud, Frederique; Luise Voelker, Antje Helga; Turon, Jean-louis.
New dinoflagellate cyst (dinocyst) analyses were carried out at high resolution in core MD99-2339, retrieved from a contouritic field in the central part of the Gulf of Cadiz, for the Marine Isotope Stage (MIS) 3 interval, allowing for discussion of palaeohydrological changes over the last 50 ky in the subtropical NE Atlantic Ocean. Some index dinocyst taxa, according to their (palaeo) ecological significance, shed light on significant sea-surface changes. Superimposed on the general decreasing pattern of dinocyst export to the seafloor over the last 50 ky, paralleling the general context of decreasing aeolian dust fertilization, a complex variability in dinocyst assemblages was detected at the millennial timescale. Enhanced fluvial discharges occurred...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53220/54807.pdf

PICABIA MD 134 - Rapport scientifique. A bord du Marion Dufresne II
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Turon, Jean-louis; Malaize, Bruno.
La Mission océanographique PICABIA MD 134 est la dernière d’un long périple entamé le 4 Mai 2003 avec la campagne PICASSO MD 132 (Paleoclimatology Isotopes Calypso pour les séries sédimentaires Océaniques) . A Brest la campagne SEDICAR (MD 133) a pris le relais avec trois étapes dans le Golfe de Gascogne : BREST –BREST (24/06- 28/06); Après une escale technique, le deuxième leg (12/07-14/07) a permis de relier Brest à Bordeaux (escale et cérémonies officielles des14 Juillet-15 Juillet). SEDICAR 3 a été réalisée entre Bordeaux et la sortie du Golfe de Gascogne.De fait, la campagne PICABIA -MD 134 (Paléoclimatology, Calypso sur la Bordure Ibérique et Africaine) a débuté officiellement le 19 Juillet à 0 :00 heure. Cette mission et les programmes français sont...
Tipo: Text
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00632/74458/74276.pdf

Position of the Polar Front along the western Iberian margin during key cold episodes of the last 45 ka
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Eynaud, Frederique; De Abreu, Lucia; Voelker, Antje; Schoenfeld, Joachim; Salgueiro, Emilia; Turon, Jean-louis; Penaud, Aurelie; Toucanne, Samuel; Naughton, Filipa; Goni, Maria Fernanda Sanchez; Malaize, Bruno; Cacho, Isabel.
This paper documents the migration of the Polar Front (PF) over the Iberian margin during some of the cold climatic extremes of the last 45 ka. It is based on a compilation of robust and coherent paleohydrological proxies obtained from eleven cores distributed between 36 and 42 degrees N. Planktonic delta O-18 (Globigerina bulloides), ice-rafted detritus concentrations, and the relative abundance of the polar foraminifera Neogloboquadrina pachyderma sinistral were used to track the PF position. These three data sets, compared from core to core, show a consistent evolution of the sea surface paleohydrology along the Iberian margin over the last 45 ka. We focused on five time slices representative of cold periods under distinct paleoenvironmental forcings:...
Tipo: Text
Palavras-chave: Polar Front; LGM; Heinrich events.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00218/32909/31415.pdf

SEDICAR MD 133 - Rapport scientifique à bord du Marion Dufresne II
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bourillet, Jean-françois; Turon, Jean-louis.
La campagne SEDICAR (SEDIment CARottage) à bord du navire océanographique Marion Dufresne s’est déroulée dans le golfe de Gascogne. Le navire et ses équipements scientifiques associés étaient mis à disposition par l’IPEV. Au cours des trois parties, le navire a relié Brest à Brest (24-28 juin 03), Brest à Bordeaux (12-14 juillet 03) et Bordeaux à Las Palmas (14 au 24 juillet 03). Pour la première partie, l’équipe scientifique SEDICAR a bénéficié du soutien de l’équipe partielle de la mission précédente PICASSO ; pour la troisième partie, elle est venue renforcer l’équipe de la mission PICABIA. Les travaux de la campagne SEDICAR se sont terminés le 19 juillet 2003 à la sortie du golfe de Gascogne. Les responsables scientifiques étaient Jean-François...
Tipo: Text
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00257/36807/35435.pdf

The first estimation of Fleuve Manche palaeoriver discharge during the last deglaciation: Evidence for Fennoscandian ice sheet meltwater flow in the English Channel ca 20-18 ka ago
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Toucanne, Samuel; Zaragosi, Sebastien; Bourillet, Jean-francois; Marieu, Vincent; Cremer, Michel; Kageyama, Masa; Van Vliet-lanoe, Brigitte; Eynaud, Frederique; Turon, Jean-louis; Gibbard, Philip L.
The Fleuve Manche (English Channel) palaeoriver represents the largest river system that drained the European continent during Pleistocene lowstands, particularly during the Elsterian (Marine Isotope Stage 12) and Saalian Drenthe (MIS 6) glaciations when extensive ice advances into the North Sea area forced the central European rivers to flow southwards to the Bay of Biscay (NE Atlantic). Numerous long piston cores and high-resolution acoustic data from the northern Bay of Biscay have been correlated using a well-constrained chronostratigraphical framework, and for the first time allow the estimation of the discharge of the Fleuve Manche palaeoriver at the end of the last glacial period (i.e. Weichselian). Our results, discussed in the light of...
Tipo: Text
Palavras-chave: Fleuve Manche palaeoriver; English Channel; Sediment and meltwater discharge; European ice sheet; Deglaciation; Termination 1; North Sea area; European drainage network.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11310/7858.pdf