Articles | Volume 18, issue 11
https://doi.org/10.5194/amt-18-2439-2025
https://doi.org/10.5194/amt-18-2439-2025
Research article
 | 
10 Jun 2025
Research article |  | 10 Jun 2025

Robustness of atmospheric trace gas retrievals obtained from low-spectral-resolution Fourier transform infrared absorption spectra under variations of interferogram length

Bavo Langerock, Martine De Mazière, Filip Desmet, Pauli Heikkinen, Rigel Kivi, Mahesh Kumar Sha, Corinne Vigouroux, Minqiang Zhou, Gopala Krishna Darbha, and Mohmmed Talib

Data sets

Formaldehyde (HCHO) RD groundbased remote sensing data from the FTIR instrument FMI001 at Sodankylä FMI-ARC R. Kivi et al. https://doi.org/10.60897/ndacc.sodankyla_ftir.h2co_fmi001_rd

Model code and software

SFIT4 Line-by-line nonlinear spectral fitting software: version 1.0.21 J. Hannigan et al. https://doi.org/10.18758/CLYG3EUO

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Short summary
Ground-based Fourier transform interferometer instruments have been used for many decades to measure direct solar light in the infrared to obtain high-resolution spectra from which atmospheric gas profile concentrations can be derived. It is shown that the typical processing chain used to derive atmospheric gas columns can be sensitive to relatively small shortenings of the recorded interferograms. Low-resolution recordings, used in more recent years, are more sensitive to such adaptations.
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