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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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