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
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
The color scale describes SLA in centimeters.
This animation is derived from Merged Gridded Sea Level
Anomaly (MSLA) product available at
were produced by Ssalto/Duacs and distributed by Aviso, with
support from Cnes".