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The long-term evolution of the vertical column abundance of carbontetrafluoride (CF4) above the high-altitude Jungfraujoch station (SwissAlps, 46.5° N, 8.0° E, 3580 m a.s.l.) has been derived fromthe spectrometric analysis of Fourier transform infrared solar spectrarecorded at that site between 1989 and 2012. The investigation is based on amulti-microwindow approach, two encompassing pairs of absorption linesbelonging to the R-branch of the strong ν3 band of CF4centered at 1283 cm−1, and two additional ones to optimally account forweak but overlapping HNO3 interferences. The analysis reveals a steadyaccumulation of the very long-lived CF4 above the Jungfraujoch at meanrates of (1.38 ± 0.11) × 1013 molec cm−2 yr−1 from 1989to 1997, and (0.98 ± 0.02) × 1013 molec cm−2 yr−1 from1998 to 2012, which correspond to linear growth rates of 1.71 ± 0.14and 1.04 ± 0.02% yr−1 respectively referenced to 1989 and1998. Related global CF4 anthropogenic emissions required to sustainthese mean increases correspond to 15.8 ± 1.3 and 11.1 ± 0.2 Gg yr−1 over the above specified time intervals. Findings reported hereare compared and discussed with respect to relevant northern mid-latituderesults obtained remotely from space and balloons as well as in situ at theground, including new gas chromatography mass spectrometry measurementsperformed at the Jungfraujoch since 2010

atmospheric measurement techniques

Spectrometric monitoring of atmospheric carbon tetrafluoride (CF&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;) above the Jungfraujoch station since 1989: evidence of continued increase but at a slowing rate