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. SF6 total columns were successfully retrieved from FTIR (Fourier transform infrared)measurements (Saint Denis and Maido) on Reunion Island(21 ∘  S, 55 ∘  E) between 2004 and 2016 using the SFIT4algorithm: the retrieval strategy and the error budget werepresented. The FTIR SF6 retrieval has independentinformation in only one individual layer, covering the whole of thetroposphere and the lower stratosphere. The trend in SF6 wasanalysed based on the FTIR-retrieved dry-air column-averaged molefractions ( X SF 6 ) on Reunion Island, the in situmeasurements at America Samoa (SMO) and the collocated satellitemeasurements (MichelsonInterferometer for Passive Atmospheric Sounding, MIPAS, and Atmospheric Chemistry Experiment Fourier Transform Spectrometer, ACE-FTS) in the southern tropics. The SF6 annual growth rate from FTIR retrievals is 0.265±0.013 pptv year−1 for 2004–2016, which is slightlyweaker than that from the SMO in situ measurements( 0.285±0.002 pptv year−1 ) for the same time period. The SF6 trend in the troposphere from MIPAS and ACE-FTSobservations is also close to the ones from the FTIR retrievals andthe SMO in situ measurements.

Ground-based FTIR retrievals of SF&lt;sub&gt;6&lt;/sub&gt; on Reunion Island

Ground-based FTIR retrievals of SF<sub>6</sub> on Reunion Island