FTIR spectroscopy; atmospheric composition and trend; greenhouse gas
Abstract :
[en] SF6 total columns were successfully retrieved from FTIR (Fourier transform infrared) measurements (Saint Denis and Maïdo) on Reunion Island (21º S, 55º 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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Zhou, M.
Langerock, B.
Vigouroux, C.
Wang, P.
Hermans, C.
Stiller, G.
Walker, K. A.
Dutton, G.
Mahieu, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
De Mazière, M.
Language :
English
Title :
Ground-based FTIR retrievals of SF6 on Reunion Island
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