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Atmos. Meas. Tech., 11, 651-662, 2018
https://doi.org/10.5194/amt-11-651-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
02 Feb 2018
Ground-based FTIR retrievals of SF6 on Reunion Island
Minqiang Zhou1,2,3, Bavo Langerock2, Corinne Vigouroux2, Pucai Wang1,3, Christian Hermans2, Gabriele Stiller4, Kaley A. Walker5, Geoff Dutton6, Emmanuel Mahieu7, and Martine De Mazière2 1Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
2Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
3University of Chinese Academy of Sciences, Beijing, China
4Karlsruhe Institute of Technology, Karlsruhe, Germany
5University of Toronto,Toronto, Canada
6Earth System Research Laboratory, NOAA, Boulder, Colorado, USA
7Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium
Abstract. SF6 total columns were successfully retrieved from FTIR (Fourier transform infrared) measurements (Saint Denis and Maïdo) on Reunion Island (21° S, 55° E) between 2004 and 2016 using the SFIT4 algorithm: the retrieval strategy and the error budget were presented. The FTIR SF6 retrieval has independent information in only one individual layer, covering the whole of the troposphere and the lower stratosphere. The trend in SF6 was analysed based on the FTIR-retrieved dry-air column-averaged mole fractions (XSF6) on Reunion Island, the in situ measurements at America Samoa (SMO) and the collocated satellite measurements (Michelson Interferometer 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 slightly weaker 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-FTS observations is also close to the ones from the FTIR retrievals and the SMO in situ measurements.

Citation: Zhou, M., Langerock, B., Vigouroux, C., Wang, P., Hermans, C., Stiller, G., Walker, K. A., Dutton, G., Mahieu, E., and De Mazière, M.: Ground-based FTIR retrievals of SF6 on Reunion Island, Atmos. Meas. Tech., 11, 651-662, https://doi.org/10.5194/amt-11-651-2018, 2018.
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Short summary
SF6 total columns are successfully retrieved from FTIR measurements (Saint Denis and Maïdo) at Reunion Island (21° S, 55° E) between 2004 and 2016 using the SFIT4 algorithm: the retrieval strategy and the error budget are discussed. The trend of SF6 is analysed based on the FTIR retrievals at Reunion Island, the in situ measurements at America Samoa (SMO) and the collocated satellite measurements (MIPAS and ACE-FTS) in the southern tropics. The results show good agreement.
SF6 total columns are successfully retrieved from FTIR measurements (Saint Denis and Maïdo) at...
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