Cornelis. E. Blom, IMK-FZK, Karlsruhe, GermanyBruno Carli and Ugo Cortesi, IROE-CNR, Firenze, ItalyGianluca Redaelli, University of L’Aquila, L’Aquila, ItalyMartyn P. Chipperfield, University of Leeds, Leeds, United Kingdom

APE-GAIA: Airborne Polar Experiment - Geophysica Aircraft In Antarctica

Forschungszentrum KarlsruheTechnik und Umwelt

AbstractWe report about the field campaign APE-GAIA conducted by the high altitude research aircraft M55-Geophysica in the Antarctic region, to study chemical and dynamical processes related to stratospheric ozone depletion. An overview of the mission objectives and a summary of the scientific flights is presented, along with preliminary results.

Juli 2000

Fig. 1: Map of the test flight and the five scientific flights performed by the M55-Geophysica from the base of Ushuaia (Argentina) during the APE-GAIA mission

Fig. 2: Altitude, latitude and in-situ measurements of minor constituents acquired during the flight of 23rd September 1999. The measurements are preliminary.

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Fig. 4:The volume mixing ratio [ppmv] of nitric acid as a function of altitude andlatitude from MIPAS-STR measurements on two legs of the flight of 23rdSeptember 1999. The 2-dimensional distribution is obtained from about 50individual profiles.

Fig. 3:The volume mixing ratio [pptv] of ClO as a function of altitude andlatitude from SAFIRE-A measurements on two legs of the flight of 23rd

September 1999.