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| Titel |
Spectrometric monitoring of atmospheric carbon tetrafluoride (CF4) above the Jungfraujoch station since 1989: evidence of continued increase but at a slowing rate |
| VerfasserIn |
E. Mahieu, R. Zander, G. C. Toon, M. K. Vollmer, S. Reimann, J. Mühle, W. Bader, B. Bovy, B. Lejeune, C. Servais, P. Demoulin, G. Roland, P. F. Bernath, C. D. Boone, K. A. Walker, P. Duchatelet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 1 ; Nr. 7, no. 1 (2014-01-31), S.333-344 |
| Datensatznummer |
250115575
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| Publikation (Nr.) |
 copernicus.org/amt-7-333-2014.pdf |
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| Zusammenfassung |
| The long-term evolution of the vertical column abundance of carbon
tetrafluoride (CF4) above the high-altitude Jungfraujoch station (Swiss
Alps, 46.5° N, 8.0° E, 3580 m a.s.l.) has been derived from
the spectrometric analysis of Fourier transform infrared solar spectra
recorded at that site between 1989 and 2012. The investigation is based on a
multi-microwindow approach, two encompassing pairs of absorption lines
belonging to the R-branch of the strong ν3 band of CF4
centered at 1283 cm−1, and two additional ones to optimally account for
weak but overlapping HNO3 interferences. The analysis reveals a steady
accumulation of the very long-lived CF4 above the Jungfraujoch at mean
rates of (1.38 ± 0.11) × 1013 molec cm−2 yr−1 from 1989
to 1997, and (0.98 ± 0.02) × 1013 molec cm−2 yr−1 from
1998 to 2012, which correspond to linear growth rates of 1.71 ± 0.14
and 1.04 ± 0.02% yr−1 respectively referenced to 1989 and
1998. Related global CF4 anthropogenic emissions required to sustain
these mean increases correspond to 15.8 ± 1.3 and 11.1 ± 0.2 Gg yr−1 over the above specified time intervals. Findings reported here
are compared and discussed with respect to relevant northern mid-latitude
results obtained remotely from space and balloons as well as in situ at the
ground, including new gas chromatography mass spectrometry measurements
performed at the Jungfraujoch since 2010. |
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