Ozone soundings are performed from Spitzbergen (79¿N, 12¿E) by an ozone LIDAR and balloon sondes. The development of the ozone layer from January until the end of March 1989 shows no major depletion, but a significant increase in mid-February due to the stratospheric warming. In March a secondary concentration maximum occured above the tropopause. ¿ American Geophysical Union 1990 |