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Mixing structures in the Mediterranean Sea from Finite-Size Lyapunov Exponents

AutorD'Ovidio, Francesco; Fernández, Vicente; Hernández-García, Emilio ; Hernández-García, Emilio ; Hernández-García, Emilio ; López, Cristóbal
Palabras clave[AGU] Oceanography: Physical: Turbulence, diffusion, and mixing processes
[AGU] Mathematical Geophysics: Nonlinear dynamics
[AGU] Mathematical Geophysics: Chaos
[AGU] Oceanography: General: Numerical modeling
[AGU] Oceanography: Physical: Upper ocean processes
Fecha de publicación2-sep-2004
EditorAmerican Geophysical Union
CitaciónGeophysical Research Letters 31: L17203 (2004)
ResumenWe characterize horizontal mixing and transport structures in the surface circulation of the Mediterranean Sea, as obtained from a primitive equation circulation model. We calculate the Finite Size Lyapunov Exponents (FSLEs) of the velocity data set, which gives a direct measure of the local stirring. By proper election of the FSLE parameters, we focus on the mesoscale structures, locating a number of vortices embedded in an intricate network of high-stretching lines. These lines control transport in the system. At the edge of the vortices, a dense tangle of line intersections appears, identifying strong mixing. The spatial distribution of FSLEs, averaged over one year, allows to classify areas in the Mediterranean basin according by their mixing activity. The space average of FSLEs on selected geographical regions gives a measure for quantifying and comparing the mixing seasonal variability.
Descripción7 pages, 6 figures.-- AGU Index terms: 4568, 3220, 3240, 4255, 4572.-- ArXiv pre-print available: http://arxiv.org/abs/nlin/0404041
Versión del editorhttp://dx.doi.org/10.1029/2004GL020328
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