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Evolution of an oceanic anticyclone in the lee of Madeira Island: In situ and remote sensing survey ArchiMer
Caldeira, Rui M. A.; Stegner, Alexandre; Couvelard, Xavier; Araujo, Isabel B.; Testor, Pierre; Lorenzo, Alvaro.
Island wakes are areas of a strong eddy activity influencing the availability and transport of organic matter in the ocean which, in turn impact biological productivity. Despite this, eddy formation in the lee of North Atlantic tropical islands is scarcely documented, except for the Canary Islands. Moreover, the occurrence of anticyclones leeward of Madeira has seldom been detected. During the summer of 2011, a multiplatform approach, combining satellite data with in situ measurements, was used to study an anticyclonic eddy generated in the lee of the Madeira Island. The main objective was to confirm recent numerical evidence suggesting that orographically perturbed winds can induce anticyclonic eddies leeward of Madeira, particularly during summer months....
Tipo: Text Palavras-chave: Boundary-layer; Inertial instability; Mode water; Mixed layer; Intrathermocline eddies; Wake.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00197/30846/29209.pdf
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Intrathermocline Eddies Embedded within an Anticyclonic Vortex Ring ArchiMer
Meunier, Thomas; Tenreiro, M.; Pallas-sanz, Enric; Ochoa, Jose; Ruiz-angulo, Angel; Portela, Esther; Cusi, Simo; Damien, Pierre; Carton, Xavier.
High‐resolution hydrographic measurements reveal the presence of three Intra‐Thermocline Eddies (ITEs) embedded within a Loop Current Eddy (LCE). ITEs are lenticular bodies of nearly homogeneous water which contrasts with the well stratified surrounding water. Their radii and thickness ranged between [19‐32] km and [150‐250] m. Negative relative vorticity within their cores (down to ‐0.85 times the Coriolis frequency), along with a large negative stratification anomaly, result in low Ertel Potential Vorticity (PV) and intense negative Ertel Potential Vorticity Anomalies (PVA). Vortex stretching and relative vorticity have comparable contributions to PVA, resulting in Burger numbers of order unity. The similarity of thermohaline properties within the ITE's...
Tipo: Text Palavras-chave: Intrathermocline eddies; Submesoscale coherent vortices; Vortex lenses; Loop current eddy; Gulf of Mexico; Submesoscale.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00440/55122/56578.pdf
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Optimal Perturbations of an Oceanic Vortex Lens ArchiMer
Meunier, Thomas; Menesguen, Claire; Carton, Xavier; Le Gentil, Sylvie; Schopp, Richard.
The stability properties of a vortex lens are studied in the quasi geostrophic (QG) framework using the generalized stability theory. Optimal perturbations are obtained using a tangent linear QG model and its adjoint. Their fine-scale spatial structures are studied in details. Growth rates of optimal perturbations are shown to be extremely sensitive to the time interval of optimization: The most unstable perturbations are found for time intervals of about 3 days, while the growth rates continuously decrease towards the most unstable normal mode, which is reached after about 170 days. The horizontal structure of the optimal perturbations consists of an intense counter-shear spiralling. It is also extremely sensitive to time interval: for short time...
Tipo: Text Palavras-chave: Vortex lenses; Intrathermocline eddies; Instability; Optimal perturbations.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00454/56605/58297.pdf
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