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Registros recuperados: 6
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Biweekly current oscillations on the continental slope of the Gulf of Guinea ArchiMer
Vangriesheim, Annick; Treguier, Anne-marie; Andre, Gael.
Current meter measurements have been carried out for 3 years on the continental slope of the Gulf of Guinea, near 7.5 degrees S off the Angola coast. Currents in a water depth of 1300 m over the continental slope show a remarkable biweekly oscillation, bottom intensified, and with currents oriented nearly parallel to the isobaths. With a peak-to-peak amplitude reaching 20-30 cm s(-1) at 30 in above the bottom, this signal is the most energetic at sub-inertial frequencies. Simultaneous measurements deeper on the continental rise (in a water depth of 4000 m) show a more complex signal dominated by lower frequencies, and with less clear polarization. Simple linear topographic wave theories are compared to the observations. A combination of coastal trapped...
Tipo: Text Palavras-chave: Linear wave model; Current meter measurement; Current oscillation; Continental slope.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1032.pdf
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Can satellite-derived chlorophyll imagery be used to trace surface dynamics in coastal zone? A case study in the northwestern Mediterranean Sea ArchiMer
Forget, Philippe; Andre, Gael.
A comparison of chlorophyll data from SeaWiFS imagery and modeling results from a 3D hydrodynamical model was performed over the northwestern Mediterranean for the entire year of 2001. The study aims at investigating the information content brought by satellite-derived chlorophyll concentration ([Chl]) maps concerning surface dynamics in coastal zone. The study is mainly focused on the Gulf of Lions (GoL) and its outer region, which are mainly influenced by the Rh ne River, local winds and the Northern Current (NC) flowing from the East along the continental slope. The physical hydrodynamical model was continuously run and 40 SeaWiFS images, presenting a significant coverage of the studied area, were selected. The comparison between [ Chl] and sea surface...
Tipo: Text Palavras-chave: MARS hydrodynamical model; Surface chlorophyll; SeaWiFS; Gulf of Lions.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-6205.pdf
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Circulation around La Reunion and Mauritius islands in the south-western Indian Ocean: A modeling perspective ArchiMer
Pous, Stephane; Lazure, Pascal; Andre, Gael; Dumas, Franck; Halo, Issufo; Penven, Pierrick.
Circulation around both islands is dominated by westward propagating features The predominant time scale of variability of currents and SSH is 60 days There is local generation of eddies in the lee of the islands due to topography
Tipo: Text Palavras-chave: Ocean circulation; Hydrodynamic model; La Reunion; Eddies; Rossby waves.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00195/30624/29073.pdf
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Echanges côte-large à moyenne échelle au niveau de la pente continentale du Golfe du Lion. Processus et Modélisation ArchiMer
Andre, Gael.
Dynamics of water mass exchanges between the Gulf of Lions (GoL) and the open sea are driven by several physical processes, which influence circulation at several spacio-temporal scales. This study, based on a realistic modelling during two years, aims to bring a better knowledge of circulation and hydrodynamics processes occurring in the NW Mediterranean Sea and in the GoL. Firstly, the NW Mediterranean Basin circulation modelled during the year 2001 is compared with Sea Surface Temperature (SST) satellite measurements (AVHRR) and with the MEDATLAS climatology. These comparisons show a good agreement concerning surface patterns and seasonal variability of the large scale circulation. At lower scale, several processes influence circulation over the shelf...
Tipo: Text Palavras-chave: Instabilities; Meso scale variability; Slope current; Hydrodynamical modelling; Gulf of Lions; Mediterranean Sea; Instabilité; Variabilité méso échelle; Courant de pente; Modélisation hydrodynamique; Golfe du Lion; Mer Méditerranée.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3673.pdf
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Infragravity waves: from driving mechanisms to impacts ArchiMer
Bertin, Xavier; De Bakker, Anouk; Van Dongeren, Ap; Coco, Giovanni; Andre, Gael; Ardhuin, Fabrice; Bonneton, Philippe; Bouchette, Frederic; Castelle, Bruno; Crawford, Wayne C.; Davidson, Mark; Deen, Martha; Dodet, Guillaume; Guerin, Thomas; Inch, Kris; Leckler, Fabien; Mccall, Robert; Muller, Heloise; Olabarrieta, Maitane; Roelvink, Dano; Ruessink, Gerben; Sous, Damien; Stutzmann, Eleonore; Tissier, Marion.
Infragravity (hereafter IG) waves are surface ocean waves with frequencies below those of wind-generated "short waves" (typically be- low 0.04 Hz). Here we focus on the most common type of IG waves, those induced by the presence of groups in incident short waves. Three related mechanisms explain their generation: (1) the development, shoaling and release of waves bound to the short-wave group envelopes (2) the modulation by these envelopes of the location where short waves break, and (3) the merging of bores (breaking wave front, resembling to a hydraulic jump) inside the surfzone. When reaching shallow water (O(1-10 m)), IG waves can transfer part of their energy back to higher frequencies, a process which is highly dependent on beach slope. On gently...
Tipo: Text Palavras-chave: Infragravity waves; Bound wave; Dissipation; Reflection; Sediment transport; Barrier breaching; Seiche; Earth hum.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00417/52876/53800.pdf
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Mesoscale slope current variability in the Gulf of Lions. Interpretation of in-situ measurements using a three-dimensional model ArchiMer
Andre, Gael; Garreau, Pierre; Fraunie, Philippe.
The ECOLOPHY experiments aimed at investigating physical exchanges between coastal and open sea. They were carried out in June and December 2005 over the shelf-break in the North-eastern part of the Gulf of Lions (Northwestern Mediterranean Sea). This area is considered to be the generation zone for the eddy and meandering structures of the Northern Current (NC). The objective of the present work is to examine mesoscale variability of this coastal slope current in the light of available data. Numerical modeling is used to support the field data analysis. ADCP current measurements over a one-year period show that mesoscale activity is maximal in late winter, correlating with the seasonal variability of the NC and, also, partly with local winds, Measured...
Tipo: Text Palavras-chave: Numerical modeling; Mesoscale variability; Slope Current; Northern Current; Gulf of Lions; Northwestern Mediterranean Sea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6461.pdf
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