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Angelique C. Haza, Tamay M. Özgökmen, Annalisa Griffa, Andrew C. Poje, and M.-Pascale Lelong

in section 5 . 2. Trajectory datasets a. Submesoscale-permitting ocean general circulation model HYCOM ° simulation is centered on the Gulf Stream and nested within a larger-scale ° North Atlantic simulation ( Fig. 1 ). The simulation is performed subject to atmospheric forcing based on monthly values from the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis, superimposed with 6-hourly anomalies from perpetual-year wind stress and wind speed data from the Navy

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Daniel Mukiibi, Gualtiero Badin, and Nuno Serra

tracers ( Badin et al. 2011 ). The traditional techniques used in the definition and identification of coherent structures make use of Eulerian fields, defining them as localized, persisting regions with values of relative vorticity or strain rate larger than their surroundings (e.g., Calil and Richards 2010 ). An alternative definition makes use of the Okubo–Weiss (OW) parameter, defined as the difference between the square of relative vorticity and horizontal strain ( Okubo 1970 ; Weiss 1991

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