Atmospheric profiling data collected from radiosondes in the Southern Ocean in the austral summer of 2016/2017 during the Antarctic Circumnavigation Expedition. Data file(s): overview_radiosonde_launches.csv sample_number: unique identifier of radiosounding launch_date [day-month-year]: date of radiosonde launch [UTC] start_time [hour-minute-second UTC]: time at which the radiosonde was turned on [UTC] SLWC attached: “yes” if radiosonde was of type RSB with attached SLWC. “no” if radiosonde was of type ABx Success: "yes" if radiosonde was launched successfully and reached above 10km height; "partly" if radiosonde was launched successfully, but the signal was lost before the radiosonde reached 10km or if some of the sensors failed; "no" if the launch was not successful