MACHU, E. E.J.. LEGOS/UMR5566/CNRS, machu@pontos.cst.cnes.fr
GARCON, V. E.J.. LEGOS/UMR5566/CNRS, Veronique.Garcon@cnes.fr

 
SEASONALITY OF THE AGULHAS RETURN CURRENT FROM REMOTELY SENSED DATA AND STATISTICAL ANALYSIS
 
In order to better constrain the carbon fluxes in the southern ocean, the role of mesoscale eddies in biological production has to be elucidated in the large sinks areas of the subtropical convergence zones. Causes of the variability of the phytoplankton distribution in relation to the forcing induced by physical environment are studied in the eastern boundary current system of the South Atlantic Ocean. Remotely sensed data from SeaWiFS for ocean color is used in conjunction with other remote sensing data (dynamical heights, SST) in the Agulhas region. Statistical data analysis such as Fourier transform and wavelets are applied to determine the nature of the temporal and spatial variability. The seasonality of the Agulhas Return Current is characterized by both, its position and the wavelength associated to its meandering Rossby wave. Correlation of ocean color with physical data helps us reveal the underlying dynamical nature of the region. In the subtropical convergence, a strong thermal gradient and an extended frontal area, with shedding of eddies, lead to an increase of primary production. This enhancement occurs on a large oceanic area and then is of great importance in carbon fluxes estimation.
 
Day: Wednesday, Feb. 3
Time: 03:45 - 04:00pm
Location: Sweeney Center
 
Code: SS31WE0345S