ENVISAT/SCIAMACHY VALIDATION WITH THE LPMA/DOAS/MINI-DOAS BALLOON GONDOLA: COMPARISON OF O-3, NO2 AND BRO PROFILES

Level 2 products (profiles of O-3, NO2, BrO) of the Envisat/SCIAMACHY instrument are validated by balloon-borne measurements of the same quantities using the same optical technique. The comparison studies with the level 2 retrievals of the University of Bremen are encouraging. Generally, the satellite and the balloon-borne O-3 retrievals agree within 15 to 20 % above 15 km. For NO2, a good agreement within about 20% is observed down to 18 km. At lower altitudes the relative differences increase, reaching about 40% at 15 km. For BrO we revisit the study of [1] which validates the scientific BrO product. A good agreement within about 20% is found between 15 and 25 km for measurements at mid and high-latitudes. The comparison for a tropical balloon flight shows, however, larger discrepancies of about 20-50%.