In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 12, No. 8 ( 2012-04-19), p. 3653-3658
Abstract:
Abstract. Long term measurements in background air (Cape Grim, Tasmania) and firn air (NEEM, Greenland) of the potent long-lived greenhouse gas SF5CF3 show that emissions declined after the late 1990s, having grown since the 1950s, and became indistinguishable from zero after 2003. The timing of this decline suggests that emissions of this gas may have been related to the production of certain fluorochemicals; production of which have been recently phased out. An earlier observation of closely correlated atmospheric abundances of SF5CF3 and SF6 are shown here to have likely been purely coincidental, as their respective trends diverged after 2002. Due to its long lifetime (ca. 900 yr), atmospheric concentrations of SF5CF3 have not declined, and it is now well mixed between hemispheres, as is also shown here from interhemispheric aircraft measurements. Total cumulative emissions of SF5CF3 amount to around 5 kT.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-12-3653-2012
DOI:
10.5194/acp-12-3653-2012-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2012
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
