Model Descriptions The ocean general circulation model used here is the Los Alamos National Laboratory (LANL) Parallel Ocean Program (POP) model. It is a three-dimensional, z-level primitive equation model with a free-surface boundary condition. It is designed to run on multi-processor machines and is highly scalable onto a large number of processors provided the processor sub-grid is large enough. Technical details of the code and its adaptation for massively parallel computers can be found at http://climate.acl.lanl.gov 0.28-degree, 20-level POP run ( Maltrud et al., 1998). Domain: 77°S-77°N, Mercator grid, 0.28^o at the equator, 20 vertical levels. Winds: Daily European Centre for Medium-Range Forecasts (ECMWF) for 1993-1997. Surface heat fluxes: Barnier et al. (1995) ECMWF climatological fields. Surface salinity: Restored to Levitus (1982). All surface forcing fields interpolated to each model timestep. Daily snapshots of model velocities from uppermost level (12.5 m) saved for comparison with velocities from drifters drogued at 15 m. 0.1-degree, 40-level North Atlantic POP run. Domain: 20°S-72°N, 98°W-17°E, Mercator grid 0.1^o at the equator, 40 vertical levels. Winds: Daily Navy Operational Global Atmospheric Prediction System (NOGAPS) for 1993-1997 Surface heat fluxes: Barnier et al. (1995) climatological fields. Surface salinity: Restored to Levitus (1982). All surface forcing fields interpolated to each model timestep. Initialized from an earlier 15-year North Atlantic 0.1^o, 40-level POP run (Smith et al., 2000). Mixed layer: K-Profile Parameterization (Large et al., 1994). Daily snapshots of velocity from the second upper-most level (15 m) saved for the five years.		Abstract Introduction Model Descriptions Surface Drifters Numerical Trajectories Eulerian Statistics Mean Velocity Vectors MKE Ellipses EKE James test Lagrangian Statistics Diffusivities Time Scales Length Scales Summary Appendix A Appendix B Acronyms References Acknowledgements Forum