Remote sensing observations of daytime column NO₂ during the Airborne Antarctic Ozone Experiment, August 22 to October 2, 1987

A sensitive absorption spectrograph was flown on the NASA DC‐8 aircraft as part of the 1987 Airborne Antarctic Ozone Experiment to measure column abundances of O 3 , NO 2 , OClO, and BrO inside the Antarctic polar vortex. The instrument functioned successfully on all flights. Slant column NO 2 measurements were made every 300 s whenever light levels permitted observation with an absolute accuracy better than 20% and with a detection limit of 3.4×10 15 cm −2 slant column. These measurements are presented and compared with TOMS total ozone along the flight track.