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Lagrangian diagnostics of transport properties, barrier effects and mixing rates for the stratospheric polar vortex through a dynamical systems approach (FSLE)
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Spatial patterns in chemically and biologically reacting flows
No full textEn: Proceedings of the 2001 ISSAOS School, Eds. G. Boffetta, G. Lacorata, G. Visconti, A. Vulpiani.-- 41 pages, 8 figures.-- ArXiv pre-print: http://arxiv.org/abs/nlin.CD/0205009We present here a number of processes, inspired by concepts in Nonlinear Dynamics such as chaotic advection and excitability, that can be useful to understand generic behaviors in chemical or biological systems in fluid flows. Emphasis is put on the description of observed plankton patchiness in the sea. The linearly decaying tracer, and excitable kinetics in a chaotic flow are mainly the models described. Finally, some warnings are given about the difficulties in modeling discrete individuals (such as planktonic organisms) in terms of continuous concentration fields.Financial support from MCyT (Spain) projects IMAGEN REN2001-0802-C02-01/MAR and CONOCE BFM2000-1108 is greatly acknowledged. C. L. acknowledges support from MECD (Spain).Peer reviewe
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