Global increase of SF6 observed in the atmosphere

Details Global increase of SF6 observed in the atmosphere Global increase of SF6 observed in the atmosphere

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..569m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 7, p. 569-572

Physics

36

Air Pollution, Atmospheric Composition, Global Warming, Sulfur Fluorides, Trace Contaminants, Atmospheric Models, Greenhouse Effect, Man Environment Interactions

Scientific paper

High precision long-term observations of the trace gas sulphur hexafluoride (SF6) in the background air at Neumayer station, Antarctica (1886-1991), and at Izana observatory Tenerife (1991-1992), are presented. Since the very first measurements in 1970 (0.03 pptv), the purely anthropogenic greenhouse gas SF6 has increased by two orders of magnitude to a global mean value of 2.8 pptv 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 0.29 pptv 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 20 pptv for the year 2030.

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