Drifters dispersion in the Adriatic Sea: Lagrangian data and chaotic model

Guglielmo Lacorata; Erik Aurell; Angelo Vulpiani

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arXiv · chao-dyn/9902014

Drifters dispersion in the Adriatic Sea: Lagrangian data and chaotic model

Guglielmo Lacorata·Erik Aurell·Angelo Vulpiani

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Abstract

We analyze characteristics of drifter trajectories from the Adriatic Sea with recently introduced nonlinear dynamics techniques. We discuss how in quasi-enclosed basins, relative dispersion as function of time, a standard analysis tool in this context, may give a distorted picture of the dynamics. We further show that useful information may be obtained by using two related non-asymptotic indicators, the Finite-Scale Lyapunov Exponent (FSLE) and the Lagrangian Structure Function (LSF), which both describe intrinsic physical properties at a given scale. We introduce a simple chaotic model for drifter motion in this system, and show by comparison with the model that Lagrangian dispersion is mainly driven by advection at sub-basin scales until saturation sets in.

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Guglielmo Lacorata, Erik Aurell, Angelo Vulpiani. 2000-10-11. Drifters dispersion in the Adriatic Sea: Lagrangian data and chaotic model. https://arxiv.org/abs/chao-dyn/9902014

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