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Open Access item Oceanic three-dimensional Lagrangian Coherent Structures: A study in the Benguela upwelling region.

Authors:Bettencourt, Joao
López, Cristóbal
Hernández-García, Emilio
Keywords:Lagrangian Coherent Structures, Finite-Size Lyapunov exponents
Issue Date:Jul-2012
Citation:Ocean Modelling 51: 73-83 (2011)
Abstract: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 o from the upwelling front are also calculated. The LCSs are confirmed to provide pathways and barriers to transport in and out of the eddy
Publisher version (URL):http://dx.doi.org/10.1016/j.ocemod.2012.04.004
URI:http://hdl.handle.net/10261/45462
ISSN:1463-5003
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