<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Global increase of SF6 observed in the atmosphere"^^ . "High precision long-term observations of the trace gas sulphur hexafluoride (SF6) in background air at Neumayer station, Antarctica (1986-1991), and at Izana observatory, Tenerife (1991-1992), are presented. Since the very first measurements in 1970 (0.03pptv), the purely anthropogenic greenhouse gas SF6 has increased by two orders of magnitude to a global mean value of 2.8pptv in 1992. The observations can best be fitted by a quadratic curve with a recent increase rate of 8.3%/yr. A significant north-south gradient of 0.29pptv is observed. From this gradient an interhemispheric exchange time of 1.4 years is derived. A modeled atmospheric budget history agrees reasonably well with estimates of global SF6 production rates and leads to an extrapolated SF6 concentration of about 20pptv for the year 2030. "^^ . "1994" . . . . "Geophysical Research Letters "^^ . . . . . . . . . . "Ingeborg"^^ . "Levin"^^ . "Ingeborg Levin"^^ . . "Manfred"^^ . "Maiss"^^ . "Manfred Maiss"^^ . . . . . . "Global increase of SF6 observed in the atmosphere (PDF)"^^ . . . "MaissGRL1994.pdf"^^ . . . "Global increase of SF6 observed in the atmosphere (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Global increase of SF6 observed in the atmosphere (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Global increase of SF6 observed in the atmosphere (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Global increase of SF6 observed in the atmosphere (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Global increase of SF6 observed in the atmosphere (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #6867 \n\nGlobal increase of SF6 observed in the atmosphere\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .