Peculiarities and trends in the vertical ozone distribution 1973 - 2023 at Faraday/Vernadsky Antarctic station

We processed vertical ozone distribution measurements from the Faraday/Vernadsky station made by the Umkehr method for the 1973–2023 period. Ozone profiles in this unique series of ozone observations since 1973 cover pre-ozone hole times and the ozone hole period. Umkehr data from about 1200 Dobson spectrophotometer observations was processed using the UMK92 ozone profile retrieval algorithm. The Faraday/Vernadsky station is located at the edge of the ozone hole area; therefore, the total ozone column values over the station can change rapidly. This feature is seen clearly in Umkehr profiles measured during the same day in the morning and evening. In the pre-ozone hole period 1973–1983, the ozone partial column in ozone profiles maximum varies from 134 DU/layer to 56 DU/layer with the altitude of the profile maximum at 14–18 km. Profiles in ozone hole conditions usually have two maxima. The altitude area of significant depletion in ozone partial column values between these maxima located in the usual highest ozone concentration height. The values in altitudes at expected ozone maximum drop to 14–26 DU/layer. The 50-year trend in ozone profiles in the atmosphere above Faraday/Vernadsky station from pre-ozone hole times till 2023 is described and discussed.