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Global increase of SF6 observed in the atmosphere

Maiss, Manfred ; Levin, Ingeborg

In: Geophysical Research Letters , (1994),

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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.

Item Type: Article
Journal or Publication Title: Geophysical Research Letters
Date Deposited: 17 Oct 2006 08:49
Date: 1994
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Environmental Physics
Subjects: 530 Physics
Controlled Keywords: Schwefelhexafluorid, Atmosphäre, Treibhausgas
Uncontrolled Keywords: sulfur hexafluoride , atmosphere , greenhouse gas
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