In the following we interpret the velocity constituents [[??].sub.1] and [[??].sub.2] as the Stokes drift and the Ekman drift velocity constituents, respectively.
The e-folding scale of [[??].sub.2] exceeds the e-folding scale of [[??].sub.1] ([h.sub.21] > [h.sub.11]), i.e., the characteristic vertical extent of the Ekman drift layer is larger than the characteristic vertical extent of the Stokes drift layer.
While the e-folding scale of the Ekman drift velocity constituent [[??].sub.2] exceeds its rotation depth scale ([h.sub.21] > [h.sub.22]), the rotation scale of the Stokes drift velocity constituent [[??].sub.1] exceeds its e-folding scale ([h.sub.11] < [h.sub.12]).
The mismatch between the rates of hitting the coast and leaving the coast may stem from the different balance between the impact of the Ekman drift and the mean circulation and internal meso-scale dynamics on the surface drift in different seasons.
The surface dynamics is largely determined by the Ekman drift and relatively weakly correlated with the dynamics of underlying water masses during windy months.