Eddy diffusivity derived from drifter data for dispersion model applicationsReport as inadecuate




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Ocean Dynamics

, Volume 62, Issue 9, pp 1381–1398

Topical Collection on Advances in Search and Rescue at Sea

Abstract

Ocean transport and dispersion processes are at the present time simulated using Lagrangian stochastic models coupled with Eulerian circulation models that are supplying analyses and forecasts of the ocean currents at unprecedented time and space resolution. Using the Lagrangian approach, each particle displacement is described by an average motion and a fluctuating part. The first one represents the advection associated with the Eulerian current field of the circulation models while the second one describes the sub-grid scale diffusion. The focus of this study is to quantify the sub-grid scale diffusion of the Lagrangian models written in terms of a horizontal eddy diffusivity. Using a large database of drifters released in different regions of the Mediterranean Sea, the Lagrangian sub-grid scale diffusion has been computed, by considering different regimes when averaging statistical quantities. In addition, the real drifters have been simulated using a trajectory model forced by OGCM currents, focusing on how the Lagrangian properties are reproduced by the simulated trajectories.

KeywordsDrifter Lagrangian statistics Diffusivity Lagrangian models Marine turbulence Responsible Editor: Christophe Maisondieu

This article is part of the Topical Collection on Advances in Search and Rescue at Sea

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Author: Michela De Dominicis - Giovanni Leuzzi - Paolo Monti - Nadia Pinardi - Pierre-Marie Poulain

Source: https://link.springer.com/







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