Consulta: subjectFacets:"Atlantique nord-est"
Registros recuperados: 3
Data/hora: 06/06/2024 08:26:41

Instability of the Mediterranean Water undercurrents southwest of Portugal: effects of baroclinicity and of topography
Provedor de dados: 5
Autores: Cherubin, Laurent; Carton, Xavier; Paillet, Jerome; Morel, Yann; Serpette, Alain.
Southwest of Portugal, in situ data show that part of the mesoscale variability of the Mediterranean Water undercurrents is triggered by topographic effects (near capes and submarine canyons), and is driven by a dominantly baroclinic instability. The vertical alignment of these undercurrents observed at sites of eddy formation is indeed favorable to baroclinic instability. This instability is materialized by the formation of filaments and of small eddies in the Portimao canyon and of meddles near Cape Saint Vincent and near the Estramadura Promontory. Hydrological data and float trajectories reveal that these eddies have a baroclinic structure. Near Portimao canyon, the variation of the potential vorticity of the undercurrents again proves their...
Tipo: Text
Palavras-chave: Eau méditerranéenne; Sous-courants; Instabilité barocline; "meddies"; Atlantique nord-est; Mediterranean Water; Undercurrents; Baroclinic instability; Meddies; NE Atlantic.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00255/36632/35219.pdf

A new bathyphotometer for bioluminescence measurements on the Armorican continental shelf (northeastern Atlantic)
Provedor de dados: 5
Autores: Geistdoerfer, P; Vincendeau, Ma.
A new bathyphotometer has been developed by the Oceanographic Laboratory of the French Naval Academy which has performed a series of in situ bioluminescence: measurements since 1994. It is used as an additional probe to a Seabird (R) CTD. It measures planktonic bioluminescence. It is associated with a SeaTech (R) fluorometer. The Armorican shelf has particularly been investigated since July 1994. Results obtained in January and April 1995 off Brittany (France), at the entrance to the Bay of Douarnenez and in the northern Bay of Biscay are presented as examples. A method to separate the bioluminescence background from sharp peaks is presented. The strength of bioluminescence signals was related to seasonal planktonic biomass fluctuations, low in winter,...
Tipo: Text
Palavras-chave: Bioluminescence marine; Bathyphotomètre; Atlantique nord-est; Plancton; Marine bioluminescence; Bathyphotometer; Northeastern Atlantic; Plankton.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43616/43313.pdf

Les reconstitutions paléo-hydrographiques de surface dans le Golfe de Gascogne au cours de l'Holocène
Provedor de dados: 5
Autores: Zumaque, Jéna.
La carotte MD95-2002, prélevée dans le Golfe de Gascogne (47°27'N; 08 °32'W, 2174m) a fait l'objet d'analyses micropaléontologiques afin de « documenter » les changements dans les conditions palée-hydrographiques de surface et de la colonne d'eau sous-jacente au cours de l'Holocène dans l'Atlantique nord-est. Les reconstructions quantitatives basées sur les assemblages de kystes de dinoflagellés (dinokystes) et les compositions isotopiques de foraminifères planctoniques ont permis de mettre en évidence des tendances à long terme auxquelles se superpose une importante variabilité climatique. Cette dernière se traduit principalement par des fortes variations des températures d'eau de surface (Sea-Surface Temperatures - SSTs) à l'Holocène inférieur, avec des...
Tipo: Text
Palavras-chave: Holocène; Atlantique nord-est; Golfe de Gascogne; Conditions paléohydrographiques de surface; Dinokystes; Foraminifères planctoniques; Compositions isotopique; Oscillation Nord Atlantique.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00499/61040/64447.pdf