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- Title
Eddy diffusivity derived from drifter data for dispersion model applications.
- Authors
Dominicis, Michela; Leuzzi, Giovanni; Monti, Paolo; Pinardi, Nadia; Poulain, Pierre-Marie
- 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.
- Subjects
MEDITERRANEAN Sea; MARITIME shipping; STOCHASTIC models; OCEAN currents; SIMULATION methods &; models; ATMOSPHERIC turbulence; OCEAN circulation
- Publication
Ocean Dynamics, 2012, Vol 62, Issue 9, p1381
- ISSN
1616-7341
- Publication type
Article
- DOI
10.1007/s10236-012-0564-2