title: Global increase of SF6 observed in the atmosphere
creator: Maiss, Manfred
creator: Levin, Ingeborg
subject: 530
subject: 530 Physics
description: 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. 
date: 1994
type: Article
type: info:eu-repo/semantics/article
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/6867/1/MaissGRL1994.pdf
identifier: DOI:10.11588/heidok.00006867
identifier: urn:nbn:de:bsz:16-opus-68673
identifier:   Maiss, Manfred ; Levin, Ingeborg  (1994) Global increase of SF6 observed in the atmosphere.  Geophysical Research Letters .       
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/6867/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng