Das Projekt "Vertikale Verteilung von Primaergasen in der suedlichen Hemisphaere" wird vom Umweltbundesamt gefördert und von Max-Planck-Gesellschaft zur Förderung der Wissenschaften, Max-Planck-Institut für Aeronomie durchgeführt. Objective: To understand the global distribution of ozone and its changes due to anthropogenic emissions. General Information: Balloon flights will be made in Mendoza (Argentine) in order to measure the vertical distribution (up to about 35 km altitude) of source gases which are important for the photo-chemistry of ozone: H2, CH4, N2O, CH3Br, CF4, C2F6, CO, CFC13, CF2C12, CF3C1, CHF2C1, C2F3C13, C2F4C12, C2F5C1, CH3CC13, CF3Br, C2H6, C3H8. The results of these measurements will be interpreted using model computations.