Articles | Volume 5, issue 11
Atmos. Meas. Tech., 5, 2969–2980, 2012
Atmos. Meas. Tech., 5, 2969–2980, 2012

Research article 29 Nov 2012

Research article | 29 Nov 2012

XCO2-measurements with a tabletop FTS using solar absorption spectroscopy

M. Gisi1, F. Hase1, S. Dohe1, T. Blumenstock1, A. Simon2, and A. Keens2 M. Gisi et al.
  • 1Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
  • 2Bruker Optics GmbH, Ettlingen, Germany

Abstract. A commercial low-resolution (0.5 cm−1) Fourier Transform Spectrometer (FTS) has been modified and is used for determining the total column XCO2 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.