EVIDENCE OF LARGE-SCALE OZONE DEPLETION WITHIN THE ARCTIC POLAR VORTEX 94 95 BASED ON AIRBORNE LIDAR MEASUREMENTS/

Measurements with an airborne lidar performed during the Arctic winter 1994/95 show, that the ozone mixing ratio declined by about 50% throu ghout the polar vortex in the period from the beginning of February to mid of March in a sharp defined altitude band from 420 K to 520 K pot ential temperature. The simultaneous detection of the stratospheric ae rosol density provides evidence that this depletion was not caused by dynamical processes but by chemical reactions.