Abstract:
Tropospheric ozone depletion events during the Antarctic spring of 06/07 and 07/08 were observed. DOAS measurements of near surface BrO and O3 concentrations were made at three locations: Cape Bird (06-07 and 07-08 seasons), the sea ice below Arrival Heights (06-07 and 07-08 seasons) and from sea ice close to Inaccessible Island (07-08 season). BrO slant columns were measured, near surface O3
... were determined and snow samples were collected and analysed for mercury and pH. Two ozone depletion events were captured in the 06-07 season and 5 were captured in the 07-08 season. The dataset for the 07-08 season consists of 6 weeks measurements on the sea-ice close to Inaccesible Island, 4 concurrent weeks with a second DOAS instrument on the sea ice below Arrival Heights and then 5 weeks at Cape Bird. Calibrations of the instruments were made at Arrival Heights. Vertical profiles of temperature, humidity and ozone up to 300 m were measured occasionally. 
