We present results obtained in the context of UE funded TRACMASS project that 
employs Lagrangian trajectories to investigate the North Atlantic and 
Mediterranean water mass circulation as they result from GCM numerical 
simulations. More specifically we will present some example of the results 
obtained in the study of the Mediterranean thermohaline circulation as the 
'section to section' transport stream function, the statistical analysis of the 
sub basin exit times and the study of the lagrangian renewal time scales versus 
water ages.