Emissions halted of the potent greenhouse gas SF<sub>5</sub>CF<sub>3</sub>
Author:
Sturges W. T.,Oram D. E.,Laube J. C.,Reeves C. E.,Newland M. J.,Hogan C.,Martinerie P.,Witrant E.,Brenninkmeijer C. A. M.,Schuck T. J.,Fraser P. J.
Abstract
Abstract. Long term measurements in background air (Cape Grim, Tasmania) and firn air (NEEM, Greenland) of the "super" greenhouse gas SF5CF3 show that emissions declined after the late 1990s, having grown since the 1950s, and became indistinguishable from zero after 2003. It is concluded that this is due to the cessation of global production of perfluorooctyl sulfonate-based fluorochemicals. 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.
Publisher
Copernicus GmbH
Reference26 articles.
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