Physics – Atmospheric and Oceanic Physics
Scientific paper
2011-11-16
Physics
Atmospheric and Oceanic Physics
Scientific paper
We study three dimensional oceanic Lagrangian Coherent Structures (LCSs) in the Benguela region, as obtained from an output from the ROMS model. To this end we first compute Finite-Size Lyapunov exponent (FSLE) fields in the region volume, characterizing mesoscale stirring and mixing there. Average FSLE values show a general decreasing trend with depth, but there is a local maximum at about 100m depth. LCSs are extracted as ridges of the calculated FSLE fields. They present a "curtain-like" geometry in which the strongest attracting and repelling structures appear as quasivertical surfaces. LCSs around a particular cyclonic eddy, pinched off from the upwelling front are also calculated. The LCSs are confirmed to provide pathways and barriers to transport in and out of the eddy.
Bettencourt João H.
Hernandez-Garcia Emilio
Lopez Cristobal
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