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A commercial low-resolution (0.5 cm<sup>−1</sup>)  Fourier Transform Spectrometer (FTS) has been modified and is used  for determining the total column XCO<sub>2</sub> of the atmosphere by  analysing direct solar radiation. The spectrometer has a small  home-built solar tracker attached, so that it is a ready-to-use  instrument. The results are validated with temporally coinciding  on-site measurements taken with a high-resolution Total Carbon  Column Observing Network (TCCON) FTIR spectrometer. For the whole  comparison period of 5 months (26 measurement days) an agreement  with TCCON results of (0.12 ± 0.08)% is achieved. This  makes the spectrometer a promising candidate for a low-cost addition  to the TCCON core FTIR sites, especially suitable for locations with  limited infrastructure. An impressive mechanical and thermal  stability is proved, enabling the spectrometer for use in field  campaigns and for the monitoring of local sources

XCO&lt;sub&gt;2&lt;/sub&gt;-measurements with a tabletop FTS using solar absorption spectroscopy

XCO<sub>2</sub>-measurements with a tabletop FTS using solar absorption spectroscopy