AIRBORNE MEASUREMENTS DURING THE EUROPEAN ARCTIC STRATOSPHERIC OZONE EXPERIMENT COLUMN AMOUNTS OF HNO3 AND O3 DERIVED FROM FTIR EMISSION SOUNDING

During the EASOE (European Arctic Stratospheric Ozone Experiment) winter campaign 1991/92, first measurements were made from an aircraft with the new atmospheric sounder MIPAS-FT (Michelson Interferometer for Passive Atmospheric Sounding - Flugzeug Transall). The instrument measures infrared radiation emitted by atmospheric trace constituents in the spectral range between 750 and 1250 cm-1. As first results, we present zenith column amounts of O3 and HNO3 retrieved from data recorded between January 30 and February 16, 1992 in the region from 45-degrees west to 45-degrees east and from 55-degrees to 80-degrees north. The column amounts vary considerably, from 1 to 3 x 10(16) molecules/cm2 for HNO3 and from 180 to 420 DU for O3, respectively. The strong linear correlation between these stratospheric gases indicates that the large variations during that period are mainly due to dynamic processes in the arctic atmosphere.