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Satellite-tracked drifter trajectoriesSatellite-tracked drifting buoys are very useful for discerning ocean circulation patterns and transport.  FOCI's drifters are steered by ocean currents occurring at about the same depth that larval pollock inhabit, ~40 meters.  Thus they indicate the trajectories that larval pollock patches might take.  The figure to the right displays trajectories of 91 drifters deployed from 1986 through 1999.  Features to note are circular paths indicating eddies southwest of Kodiak Island and transport off the shelf to the Alaskan Stream with some subsequent recirculation onto the shelf.  Animations of these drifter trajectories are useful in determining interannual variability, detecting eddies, and discovering currents.

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