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	Provedor de dados ArchiMer (6) Autor Klein, Patrice (3) Fu, Lee-lueng (2) Meunier, Thomas (2) Ubelmann, Clement (2) Angulo, Angel Ruiz (1) Buckingham, Christian (1) Chavanne, Cedric P. (1) Chen, Shuiming (1) Colin De Verdiere, Alain (1) Hochet, Antoine (1) Le Gentil, Sylvie (1) Menesguen, Claire (1) Ochoa, Jose (1) Pallas Sanz, Enric (1) Qiu, Bo (1) Sasaki, Hideharu (1) Schopp, Richard (1) Scott, Robert (1) Tenreiro, Miguel (1) Mais... Palavra-chave Quasigeostrophic models (6) Mesoscale processes (4) Models and modeling (4) Circulation/ Dynamics (3) Dynamics (2) Eddies (2) Ocean dynamics (2) Tracers (2) Vertical motion (2) : Conservation equations (1) Advection (1) Ageostrophic circulations (1) Altimetry (1) Atm/Ocean Structure/ Phenomena (1) Circulation (1) Diagnostics (1) Fourier analysis (1) General circulation models (1) In situ oceanic observations (1) Interpolation schemes (1) Mais... Tipo do documento Text (6) Ano 2019 (1) 2016 (2) 2015 (3) País France (6) Idioma Inglês (6)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 6 Primeira ... 1 ... Última The Vertical Structure of Large-Scale Unsteady Currents ArchiMer Hochet, Antoine; Colin De Verdiere, Alain; Scott, Robert. A linear model based on the quasigeostrophic equations is constructed in order to predict the vertical structure of Rossby waves and, more broadly, of anomalies resolved by altimeter data, roughly with periods longer than 20 days and with wavelengths larger than 100 km. The subsurface field is reconstructed from sea surface height and climatological stratification. The solution is calculated in periodic rectangular regions with a 3D discrete Fourier transform. The effect of the mean flow on Rossby waves is neglected, which the authors believe is a reasonable approximation for low latitudes. The method used has been tested with an idealized double- gyre simulation [performed with the Miami Isopycnal Coordinate Ocean Model (MICOM)]. The linear model is able... Tipo: Text Palavras-chave: Circulation/ Dynamics; Ocean dynamics; Rossby waves; Waves; Oceanic; Mathematical and statistical techniques; Fourier analysis; Models and modeling; Quasigeostrophic models. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00260/37081/35586.pdf Observations of Layering under a Warm-Core Ring in the Gulf of Mexico ArchiMer Meunier, Thomas; Pallas Sanz, Enric; Tenreiro, Miguel; Ochoa, Jose; Angulo, Angel Ruiz; Buckingham, Christian. Two glider transects in the Gulf of Mexico reveal fine-vertical-scale thermohaline structures within a Loop Current eddy (LCE). Partially compensating temperature and salinity anomalies are shown to organize as thin layers below the eddy and near its edges. The anomalies have vertical scales ranging from 2 to 60 m and extend laterally over distances up to 120 km. These structures are evident in synthetic acoustic reflectivity derived from the glider data and are reminiscent of the intense layering observed in seismic imagery around meddies, Agulhas rings, and warm-core Kuroshio rings. The observed layers are aligned with the geostrophic streamfunction rather than isopycnals and develop preferentially in zones of intense vertical shear. These observations... Tipo: Text Palavras-chave: Eddies; Mesoscale processes; Small scale processes; In situ oceanic observations; Quasigeostrophic models; Tracers. Ano: 2019 URL: https://archimer.ifremer.fr/doc/00600/71242/69612.pdf Dynamic Interpolation of Sea Surface Height and Potential Applications for Future High-Resolution Altimetry Mapping ArchiMer Ubelmann, Clement; Klein, Patrice; Fu, Lee-lueng. Many issues may challenge standard interpolation techniques to produce high-resolution gridded maps of sea surface height in the context of future missions like Surface Water and Ocean Topography (SWOT). The present study proposes a new method to address these challenges. Based on the conservation of potential vorticity, the method provides a simple dynamic approach to interpolation through temporal gaps between high spatial resolution observations. For gaps shorter than 20 days, the dynamic interpolation is extremely efficient and allows for the reconstruction of the time evolution of small mesoscale eddies (below 100 km) that would be smoothed out by conventional methods based on optimal mapping. Such a simple approach offers some perspectives for... Tipo: Text Palavras-chave: : Conservation equations; Eddies; Mesoscale processes; Mesoscale forecasting; Interpolation schemes; Quasigeostrophic models. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00252/36313/34865.pdf Reconstructability of 3-Dimensional Upper Ocean Circulation from SWOT Sea Surface Height Measurements ArchiMer Qiu, Bo; Chen, Shuiming; Klein, Patrice; Ubelmann, Clement; Fu, Lee-lueng; Sasaki, Hideharu. Utilizing the framework of effective surface quasi-geostrophic (eSQG) theory, we explored the potential of reconstructing the 3D upper ocean circulation structures, including the balanced vertical velocity (w) field, from high-resolution sea surface height (SSH) data of the planned SWOT satellite mission. Specifically, we utilized the 1/30°, submesoscale-resolving, OFES model output and subjected it through the SWOT simulator that generates the along-swath SSH data with expected measurement errors. Focusing on the Kuroshio Extension region in the North Pacific where regional Rossby numbers range from 0.22 to 0.32, we found that the eSQG dynamics constitutes an effective framework for reconstructing the 3D upper ocean circulation field. Using the modeled... Tipo: Text Palavras-chave: Variability; Models and modeling; General circulation models; Vertical motion; Circulation/ Dynamics; Quasigeostrophic models; Mesoscale processes; Observational techniques and algorithms; Oceanic variability; Altimetry. Ano: 2016 URL: https://archimer.ifremer.fr/doc/00309/42032/41331.pdf QuasiGeostrophic Diagnosis of Mixed-Layer Dynamics Embedded in a Mesoscale Turbulent Field ArchiMer Chavanne, Cedric P.; Klein, Patrice. A quasigeostrophic model is developed to diagnose the three-dimensional circulation, including the vertical velocity, in the upper ocean from high-resolution observations of sea surface height and buoyancy. The formulation for the adiabatic component departs from the classical surface quasigeostrophic framework considered before since it takes into account the stratification within the surface mixed layer that is usually much weaker than that in the ocean interior. To achieve this, the model approximates the ocean with two constant stratification layers: a finite-thickness surface layer (or the mixed layer) and an infinitely deep interior layer. It is shown that the leading-order adiabatic circulation is entirely determined if both the surface... Tipo: Text Palavras-chave: Circulation; Dynamics; Ageostrophic circulations; Mesoscale processes; Ocean dynamics; Vertical motion; Models and modeling; Diagnostics; Quasigeostrophic models. Ano: 2016 URL: http://archimer.ifremer.fr/doc/00309/42031/41330.pdf Tracer stirring around a meddy: The formation of layering ArchiMer Meunier, Thomas; Menesguen, Claire; Schopp, Richard; Le Gentil, Sylvie. The dynamics of the formation of layering surrounding meddy-like vortex lenses is investigated using primitive equation (PE), quasigeostrophic (QG), and tracer advection models. Recent in situ data inside a meddy confirmed the formation of highly density-compensated layers in temperature and salinity at the periphery of the vortex core. Very high-resolution PE modeling of an idealized meddy showed the formation of realistic layers even in the absence of double-diffusive processes. The strong density compensation observed in the PE model, in good agreement with in situ data, suggests that stirring might be a leading process in the generation of layering. Passive tracer experiments confirmed that the vertical variance cascade in the periphery of the vortex... Tipo: Text Palavras-chave: Circulation/ Dynamics; Advection; Dynamics; Atm/Ocean Structure/ Phenomena; Vortices; Models and modeling; Primitive equations model; Quasigeostrophic models; Tracers. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36599/35160.pdf Registros recuperados: 6 Primeira ... 1 ... Última

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