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Registros recuperados: 11
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Echanges indo-atlantiques d'eau subtropicale en relation aux structures frontales et de méso-échelle: Utilisation de la série temporelle altimétrique de niveau de la mer ArchiMer
Dencausse, Guillaume.
Indo-Atlantic exchanges of subtropical water play a crucial role in controlling global climate. The intense mesoscale activity south of Africa contributes to these exchanges, yet remains poorly described. A commonly accepted circulation scheme of those waters assmues that the subtropical gyres of the neighbouring oceans are partially connected, forming a super-gyre. Using an altimeter-derived sea-level time series spanning over 12 years, we study the exchanges through the "northern branch" of the super-gyre (Indian to Atlantic ocean), and through the "southern branch" (opposite direction). Regarding the northern branch, an initial study of the Agulhas Current Retroflection yields a statistical description of its behaviour, and shows the disrupting role of...
Tipo: Text Palavras-chave: Courant des Aiguilles; Anneaux des Aiguilles; Front Subtropical; Retroflection; Altimétrie; Échanges indo-atlantiques; Mésoéchelle; Agulhas Current; Agulhas Rings; 3subtropical Front; Retroflection; Altimetry; Indo-atlantic exchanges; Mesoscale.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00030/14091/11310.pdf
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General hydrodynamical features in the ligurian sea inferred from the dyome experiment ArchiMer
Taupier-letage, Isabelle; Millot, Claude.
Tipo: Text Palavras-chave: Hydrodynamique; Mer Ligure; Circulation générale; Moyenne échelle; Variabilité; Hydrodynamics; Ligurian Sea; General circulation; Mesoscale; Variability.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00110/22125/19761.pdf
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Mesoscale hydrological variability induced by northwesterly wind on the French continental shelf of the Bay of Biscay ArchiMer
Puillat, I; Lazure, Pascal; Jegou, Anne-marie; Lampert, Luis; Miller, P.
On the French continental shelf of the Bay of Biscay the variability of the surface salinity distribution has been mainly investigated at the seasonal and inter-annual scales. Here, new mesoscale features such as lower-salinity lenses observed in model results are investigated by hydrological measurements acquired during 8 cruises (1997-2000). These lenses are 50-80 km wide and similar to 30 m thick and occur during westerly to northerly wind events that push offshore the less saline water of river Plumes. These water masses detached from the coast are replaced with upwelled saltier water at the coast, so coastal upwelling is often observed at the same time along Landes and southern Brittany coasts. We show that in addition to the influence of seasonal and...
Tipo: Text Palavras-chave: River plume; Upwelling; Lens; Mesoscale; Salinity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3958.pdf
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Monitoring of a quasi-stationary eddy in the Bay of Biscay by means of satellite, in situ and model results ArchiMer
Caballero, Ainhoa; Ferrer, Luis; Rubio, Anna; Charria, Guillaume; Taylor, Benjamin H.; Grima, Nicolas.
The presence of a quasi-stationary anticyclonic eddy within the southeastern Bay of Biscay (centred around 44°30′N-4°W) has been reported on various occasions in the bibliography. The analysis made in this study for the period 2003–2010, by using in situ and remote sensing measurements and model results shows that this mesoscale coherent structure is present almost every year from the end of winter-beginning of spring, to the beginning of fall. During this period it remains in an area limited to the east by the Landes Plateau, to the west by Le Danois Bank and Torrelavega canyon and to the northwest by the Jovellanos seamount. All the observations and analysis made in this contribution, suggest that this structure is generated between Capbreton and...
Tipo: Text Palavras-chave: Bay of Biscay; Eddies; SWODDIES; Topographic effects; Vortex; Mesoscale; Altimetry; Satellite oceanography; Drifters; ROMS.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00161/27260/25469.pdf
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Overview of (Sub)mesoscale Ocean Dynamics for the NAAMES Field Program ArchiMer
Della Penna, Alice; Gaube, Peter.
Tipo: Text Palavras-chave: Mesoscale; Eddies; North Atlantic aerosols and marine ecosystems study; North Atlantic; NAAMES; Altimeter; Satellite oceanography; Lagrangian reanalysis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00509/62022/66142.pdf
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Performances study of interferometric radar altimeters: from the instrument to the global mission definition ArchiMer
Enjolras, Vivien; Vincent, Patrick; Souyris, Jean-claude; Rodriguez, Ernesto; Phalippou, Laurent; Cazenave, Anny.
The main limitations of standard nadir-looking radar altimeters have been known for long. They include the lack of coverage (intertrack distance of typically 150 km for the T/P / Jason tandem), and the spatial resolution ( typically 2 km for T/P and Jason), expected to be a limiting factor for the determination of mesoscale phenomena in deep ocean. In this context, various solutions using off-nadir radar interferometry have been proposed by Rodriguez and al to give an answer to oceanographic mission objectives. This paper addresses the performances study of this new generation of instruments, and dedicated mission. A first approach is based on the Wide-Swath Ocean Altimeter (WSOA) intended to be implemented onboard Jason-2 in 2004 but now abandoned. Every...
Tipo: Text Palavras-chave: Altimetry; Interferometry; Error budget; System analysis; Ocean; Mesoscale.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/00284/39507/38002.pdf
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Satellite altimetry and ocean dynamics ArchiMer
Fu, Lee Lueng; Le Traon, Pierre-yves.
This paper provides a summary of recent results derived from satellite altimetry. It is focused on altimetry and ocean dynamics with synergistic use of other remote sensing techniques, in-situ data and integration aspects through data assimilation. Topics include mean ocean circulation and geoid issues, tropical dynamics and large-scale sea level and ocean circulation variability, high-frequency and intraseasonal variability, Rossby waves and mesoscale variability.
Tipo: Text Palavras-chave: Rossby waves; Large scale; Mesoscale; Sea level; Ocean dynamics; Satellite altimetry; Ondes de Rossby; Grande échelle; Mésoéchelle; Niveau de la mer; Dynamique de l'océan; Altimétrie satellitaire.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2175.pdf
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Satellite remote sensing for an ecosystem approach to fisheries management ArchiMer
Chassot, Emmanuel; Bonhommeau, Sylvain; Reygondeau, Gabriel; Nieto, Karen; Polovina, Jeffrey J.; Huret, Martin; Dulvy, Nicholas K.; Demarcq, Herve.
Satellite remote sensing (SRS) of the marine environment has become instrumental in ecology for environmental monitoring and impact assessment, and it is a promising tool for conservation issues. In the context of an ecosystem approach to fisheries management (EAFM), global, daily, systematic, high-resolution images obtained from satellites provide a good data source for incorporating habitat considerations into marine fish population dynamics. An overview of the most common SRS datasets available to fishery scientists and state-of-the-art data-processing methods is presented, focusing on recently developed techniques for detecting mesoscale features such as eddies, fronts, filaments, and river plumes of major importance in productivity enhancement and...
Tipo: Text Palavras-chave: Ecosystem approach; Fisheries; Mesoscale; Satellite; Tracking.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00031/14188/11468.pdf
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South-Eastern Bay of Biscay eddy-induced anomalies and their effect on chlorophyll distribution ArchiMer
Caballero, Ainhoa; Rubio, Anna; Ruiz, Simon; Le Cann, Bernard; Testor, Pierre; Mader, Julien; Hernandez, Carlos.
The analysis of deep-water glider hydrographic and fluorescence data, together with satellite measurements provides a new insight into eddy-induced anomalies within the South-Eastern Bay of Biscay, during summer. Two cyclonic eddies and a SWODDY have been observed in different glider transects and by means of different sources of satellite data. Vertical profiles reveal complex structures (characteristic of the second baroclinic mode): upward/downward displacement of the seasonal/permanent thermocline in the case of X13 and the opposite thermocline displacements in the case of the cyclones. This is a typical behaviour of mode-water and “cyclonic thinny” eddies. A qualitative analysis of the vertical velocities in the anticyclone indicates that though...
Tipo: Text Palavras-chave: Eddies; Bay of Biscay; Glider; Hydrography; Mesoscale; Eddy-wind.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00326/43725/43176.pdf
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Synthesis of the POMME physical data set: One year monitoring of the upper layer ArchiMer
Gaillard, Fabienne; Mercier, Herle; Kermabon, Catherine.
The Programme Ocean Multidisciplinaire Meso Echelle (POMME) experiment was designed to describe and quantify the role of mesoscale processes in the subduction of mode waters in the northeast Atlantic. During 1 year ( September 2000 - October 2001), in situ measurements were conducted over a 8 degrees square area centered on 18 degrees W, 42 degrees N. We present the synthesis of the physical data set collected during this experiment. To improve time and space coverages, these measurements are combined with satellite information from sea surface temperature and altimetry. Daily fields of temperature, salinity, and stream function are produced over a seasonal cycle with a simplified Kalman filter. We analyze the annual cycle of the upper layer. The 1 year...
Tipo: Text Palavras-chave: Upper ocean seasonal cycle; Mesoscale; Northeast Atlantic; Subduction; Mode water; Mixed layer.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-455.pdf
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The Vertical structure of a Loop Current Eddy ArchiMer
Meunier, T.; Pallas-sanz, E.; Tenreiro, M.; Portela, E.; Ochoa, J.; Ruiz-angulo, A.; Cusi, S..
The vertical structure of a recently detached Loop Current Eddy (LCE) is studied using in‐situ data collected with an underwater glider from August to November 2016. Altimetry and Argo data are analysed to discuss the context of the eddy shedding and evolution as well as the origin and transformation of its thermohaline properties. the LCE appeared as a large body of nearly homogeneous water between 50 and 250 m confined between the seasonal and main thermoclines. A temperature anomaly relative to surrounding Gulf's water of up to 9.7 °C was observed within the eddy core. The salinity structure had a double core pattern. The subsurface fresh core had a negative anomaly of 0.27 psu while the deeper saline core's positive anomaly reached 1.22 psu. Both...
Tipo: Text Palavras-chave: Loop Current Eddies; Gulf of Mexico; Gliders; Vertical structure; Mesoscale; Vortex ring.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00450/56129/57666.pdf
Registros recuperados: 11
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