Surface and subsurface Lagrangian trajectories gathered in the Pacific 
Sector of the Southern Ocean in the framework of the activities of the 
Italian National Programme for Antarctic Research (PNRA) are studied. 
Surface drifters have been routinely deployed along the route
New Zealand - Ross Sea once a year and have proved to efficiently track
the axis of the Antarctic Circumpolar Current. A fraction of the drifters
undergoes a regime of strong eddy activity and overshoots to the north,
getting caught in the South Pacific Current and, eventually, in the
subtropical gyre circulation of the Southern Pacific. The data are
presented both in terms of pseudoeulerian and stricly Lagrangian analyses.
An attempt to characterize the vorticity behaviour in terms of the f/H
ratio calculated along the trajectories is also carried out, with a
particular focus on the crossing of the Pacific-Antarctic Ridge, which
tipically occurs in a vorticity balanced fashion. The effect of the
presence of ice coverage is also investigated.