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Registros recuperados: 4
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Generation of submesoscale frontal eddies in the Agulhas Current ArchiMer
Tedesco, Pauline; Gula, Jonathan; Ménesguen, Claire; Penven, Pierrick; Krug, M..
This study addresses the dynamics of the Agulhas inshore front in the submesoscale range upstream of 26°E. Submesoscale frontal eddies are observed in the vicinity of Port Elizabeth (26°E) from satellite images and in observations collected from under‐water gliders. Using a submesoscale‐resolving numerical model (dx ~ 0.75 km) we are able to simulate similar submesoscale eddies. Barotropic instability is confirmed as the generation mechanism by a 1D linear stability analysis and an eddy kinetic energy budget. Kinetic energy is transferred from the mean flow to the eddies through the mean horizontal shear, which is a signature of barotropic instability. When the Agulhas Current is in a non‐meandering state, submesoscale eddy generation is a recurrent...
Tipo: Text Palavras-chave: Submesoscale; Numerical Modelling; Barotropic Instability; Agulhas Current; Frontal Eddies.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00514/62520/66827.pdf
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Satellite observations of an annual cycle in the Agulhas Current ArchiMer
Krug, M.; Tournadre, Jean.
Ocean models show an annual cycle in the Agulhas Current transport which has not yet been confirmed in analyses of in-situ or satellite observations. A cross-stream coordinate approach is used to study the variability of the Agulhas Current from 18 years of along-track altimetry and merged altimetry and close to 7 years of high frequency Sea Surface Temperature (SST) observations. While the position and width of the Agulhas Current's dynamical core do not display an annual cycle, the geostrophic current speed at the current's core exhibits distinct seasonal variations, with a stronger flow observed in austral summer. The annual cycle dominates the frequency spectra of the current's core geostrophic velocities. Citation: Krug, M., and J. Tournadre (2012),...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00092/20329/17976.pdf
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Submesoscale cyclones in the Agulhas current ArchiMer
Krug, M.; Swart, S.; Gula, J..
Gliders were deployed for the first time in the Agulhas Current region to investigate processes of interactions between western boundary currents and shelf waters. Continuous observations from the gliders in water depths of 100-1000m and over a period of 1month provide the first high-resolution observations of the Agulhas Current's inshore front. The observations collected in a nonmeandering Agulhas Current show the presence of submesoscale cyclonic eddies, generated at the inshore boundary of the Agulhas Current. The submesoscale cyclones are often associated with warm water plumes, which extend from their western edge and exhibit strong northeastward currents. These features are a result of shear instabilities and extract their energy from the mean...
Tipo: Text Palavras-chave: Western boundary current; Coastal and shelf; Sub-mesoscale; Agulhas Current; Ocean gliders; Instabilities.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00376/48687/69640.pdf
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Uncovering a New Current: The Southwest MAdagascar Coastal Current ArchiMer
Ramanantsoa, Juliano D.; Penven, P.; Krug, M.; Gula, J.; Rouault, M..
Cruise data sets, satellite remote sensing observations, and model data analyses are combined to highlight the existence of a coastal surface poleward flow in the southwest of Madagascar: the Southwest MAdagascar Coastal Current (SMACC). The SMACC is a relatively shallow (<300 m) and narrow (<100 km wide) warm and salty coastal surface current, which flows along the south western coast of Madagascar toward the south, opposite to the dominant winds. The warm water surface signature of the SMACC extends from 22°S (upstream) to 26.4°S (downstream). The SMACC exhibits a seasonal variability: more intense in summer and reduced in winter. The average volume transport of its core is about 1.3 Sv with a mean summer maximum of 2.1 Sv. It is forced by a strong...
Tipo: Text
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00428/53984/55159.pdf
Registros recuperados: 4
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