Evolution of  sea level anomalies in the tropical and subtropical Atlantic in 2006



This figure shows the evolution of sea level anomaly (SLA) in the tropical and subtropical Atlantic.
The variability is dominated by westward propagating signal manifesting long oceanic (Rossby)
waves. Hovewer, the near-eqatorial signal shows clearly the eastward bound propagations: high
pressure cells in February-March and October-November,  and low propagation in July-August.
These represent the eqatorial Kelvin waves, which upon reaching the eastern boundary
transform part of their energy  into poleward-propagating coastally-trapped waves.  These poleward
propagations are the best manifested south of the equator along the coast from Gabon to
Central Angola.  

The color scale describes  SLA  in centimeters.

This animation is derived from Merged Gridded Sea Level Anomaly (MSLA) product available at
AVISO site.

Ackonwledgement:
"The altimeter products were produced by Ssalto/Duacs and distributed by Aviso, with
 support from Cnes
".


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