Estimation of tropospheric trends (1980 - 1995) for CF4 and C2F6 from stratospheric data

Jochen Harnisch; Reinhard Borchers; Peter Fabian

doi:10.1117/12.221039

20 September 1995 Estimation of tropospheric trends (1980 - 1995) for CF₄ and C₂F₆ from stratospheric data

Jochen Harnisch, Reinhard Borchers, Peter Fabian

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221039
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

In this work the stratosphere was used as archive of former tropospheric conditions. Laboratory measurements (GC/MS) of CF₄, C₂F₆, and SF₆ were carried out on stratospheric air samples obtained by cryosampling between 1983 and 1995. Characteristic relations between height and age of stratospheric air were derived from SF₆ values. For heights above 25 km ages of 6-7 years for mid-altitudes and 7-9 years for the arctic winter stratosphere were found. By correlating this age information with mixing ratios of the perfluorated carbons increase rates of 1 ppt/y for CF₄ and 0.09 ppt/y for C₂F₆ are determined for the period 1980-1995, which translates into annual injection rates of 14000 t/y and 2000 t/y respectively. Assuming aluminium production as the only major source average emissions per ton of primary aluminium are thus calculated to be 0.75 kg for CF₄ and 0.11 kg of C₂F₆ in 1990. The mass ratio of CF₄/C₂F₆ in the atmosphere is observed to have decreased from well above 30 in 1980 to below 20 in 1995.

Citation Download Citation

Jochen Harnisch, Reinhard Borchers, and Peter Fabian "Estimation of tropospheric trends (1980 - 1995) for CF₄ and C₂F₆ from stratospheric data", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221039

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