Abstract
Abstract The Lagrangian and Eulerian descriptions of the flow in a double gyre, eddy-resolving numerical simulation are compared in the context of exploring the use of drifter arrays to describe ocean circulation. The parameterization of the unresolved scales of motion in large-scale numerical ocean models is analyzed through a combination of Lagrangian and Eulerian simulated fields. Here, in Part I, the Lagrangian and Eulerian description of the flow is presented with special emphasis on the description of the eddy diffusivity field. In Part II, the limitations that coarse spatial resolution imposes on the advective–diffusive equation are tested by comparing the evolution of a passive tracer field in high- and low-resolution numerical models. The number of “buoy days” used in the numerical experiment is similar to what is expected to be launched in the Atlantic Ocean during WOCE/TOGA surface velocity program. The parameters that determine the model ocean circulation were chosen such that the mean and edd...
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