We compare the global-scale Lagrangian transport properties of the NCEP reanalysis with a 20-year simulation by the NCAR Community Climate Model Version 3 (CCM). The CCM simulation uses realistic geography and observed, time-varying, sea-surface temperatures. The transport is quantified by computing trajectories for a large-number of massless particles for the period of interest. The trajectories are analyzed using the Green's function technique of Bowman and Carrie (2002). We focus on the seasonal and hemispheric symmetries and asymmetries of the climatological global-scale transport and the differences between the NCEP Reanalysis, which is constrained by observations, and the CCM simulation, which is not. We also compare the interhemispheric exchange times and transport pathways for the two simulations.