Consulta: creatorFacets:"Halo, Issufo"
Registros recuperados: 3
Data/hora: 02/06/2024 13:01:03

Mesoscale eddy variability in the southern extension of the East Madagascar Current: Seasonal cycle, energy conversion terms, and eddy mean properties
Provedor de dados: 5
Autores: Halo, Issufo; Penven, Pierrick; Backeberg, Bjoern; Ansorge, Isabelle; Shillington, Frank; Roman, Raymond.
In this study, we used more than 17 years of satellite altimetry observations and output from an ocean model to investigate the mesoscale eddy variability and forcing mechanisms to the south of Madagascar. Analysis of energy conversion terms in the model has shown seasonality on eddy formation, both by barotropic and baroclinic instabilities: maximum in winter (JJA) and minimum in summer (DJF). The eddies were mainly formed in the upper ocean (0–300 m) and at intermediate depths (800–2000 m) by barotropic and baroclinic instabilities, respectively. The former dominated in the southeastern margin of Madagascar, and the latter to the southwest, where the South-East Madagascar Current (SEMC) separates from the continental shelf. Seasonality of the eddy...
Tipo: Text
Palavras-chave: Mesoscale eddies; Barotropic; Baroclinic instabilities; Seasonality; Eddy properties; Variability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00222/33348/31749.pdf

Cyclogeostrophic balance in the Mozambique Channel
Provedor de dados: 5
Autores: Penven, Pierrick; Halo, Issufo; Pous, Stephane; Marie, Louis.
Three methods are proposed for the inclusion of inertia when deriving currents from sea surface height (SSH) in the Mozambique Channel: gradient wind, perturbation expansion, and an iterative method. They are tested in a model and applied to satellite altimetry. For an eddy of 25 cm amplitude and 100 km radius, typical of Mozambique Channel rings at 18°S, the error made with geostrophy is 40% for the anticyclones and 20% for the cyclones. Inertia could reach one third of the pressure gradient. Geostrophy underestimates subsurface currents by up to 50 cm s−1, resulting in errors of 30–40%. The iterative method results in errors of &lt;5% for the most part of the structure. The error RMS in velocities based on 8 years of model SSH is in excess of 30 cm s−1...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00175/28617/27045.pdf

Circulation around La Reunion and Mauritius islands in the south-western Indian Ocean: A modeling perspective
Provedor de dados: 5
Autores: 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