Details for The background atmospheric concentrations of cyclic perfluorocarbon tracers determined by negat

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Name:The background atmospheric concentrations of cyclic perfluorocarbon tracers determined by negat
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Simmonds, P. G., Greally, B. R., Olivier, S., Nickless, G., Cooke, K. M., and Dietz, R. N.  The background atmospheric concentrations of cyclic perfluorocarbon tracers determined by negative ion-chemical ionization mass spectrometry.  Atmos. Environ. 36, 2147-2156 (2002).


Abstract


The background atmospheric mixing ratios for a range of cyclic perfluorocarbons (cyclic-PFCs), widely used in atmospheric dispersion studies, have been measured by gas chromatography-mass spectrometry in negative ion-chemical ionization mode. Background concentrations range from <1fll-1 to >10fll-1, where femtolitre is expressed as parts in 1015 (ppqv). Because of their very long atmospheric lifetimes (>3000yr) the present day concentrations represent the accumulated emissions from all sources, although significant commercial production did not commence until the 1960s. Cyclic-PFCs are potent greenhouse gases; however, their atmospheric concentrations are currently so low as to make an insignificant contribution to global warming.

 

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