Antarctic ozone seasonal variation analysis in the lower stratosphere from Lidar and Sounding measurements at Dumont d'Urville

Average subsidence in the Antarctic lower stratosphere for the austral fall of 1994 and 1996 and ozone destruction rates during the spring are derived from ozone measurements made at Dumont d'Urville (140.1E, 66.4S). The comparison with POAM II data suggests that ozone destruction within the vortex starts earlier on the edge than in the centre. The vortex sampling in 1996 allows us to study the vortex confinement and to confirm its role of isolating barrier above 400 K. (C) Academie des sciences/Elsevier, Paris.