Abstract. Results of balloon borne soundings with electrochemical ozone sondes carried out at 70,77°S; 11,85°E are discussed. During the polar spring in 1985 the high time resolution of soundings (about 12 launches per month) gives a detailed picture on the vertical distribution and height variations of different maxima of ozone partial pressure near the margin of the ozone hole crossing the continentalcoast above Queen Maud Land.