Resolution and Scale Dependence of Relative Dispersion in a Hierarchy of Ocean Models
Andrew Poje, Angelique Haza, Tamay Ozgokmen
City University of New York
(Abstract received 08/14/2009 for session B)
ABSTRACT
We examine a hierarchy of ocean models, ranging from simple 2D turbulence simulations to North Atlantic HYCOM output, to determine the effect of Eulerian spatial model resolution on the two particle statistics of synthetic drifter tra jectories. In each case, particle dispersion at large time and space scales is found to be controlled by hyperbolic structures produced by identifiable meso-scale features of the flow. In all cases, time-distance graphs given in terms of computed Finite Size Lyapunov Exponents show an in- crease in the extent of exponential scaling with increasing spatial smoothing of the velocity field and scaling of the limiting exponent with resolved hyperbolicity.
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