TY  - JOUR
ID  - heidok6867
AV  - public
KW  - sulfur hexafluoride 
KW  -  atmosphere 
KW  -  greenhouse gas
JF  - Geophysical Research Letters 
Y1  - 1994///
TI  - Global increase of SF6 observed in the atmosphere
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/6867/
N2  - 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. 
A1  - Maiss, Manfred
A1  - Levin, Ingeborg
ER  -