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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 5 | Copyright
Atmos. Meas. Tech., 10, 1803-1812, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 May 2017

Research article | 16 May 2017

Comparison of optical-feedback cavity-enhanced absorption spectroscopy and gas chromatography for ground-based and airborne measurements of atmospheric CO concentration

Irène Ventrillard1, Irène Xueref-Remy2, Martina Schmidt2,a, Camille Yver Kwok2, Xavier Faïn3, and Daniele Romanini1 Irène Ventrillard et al.
  • 1Univ. Grenoble Alpes, CNRS-UMR5588, Laboratoire Interdisciplinaire de Physique (LIPhy), Grenoble, France
  • 2Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR CEA-CNRS 1572, Gif-sur-Yvette, France
  • 3Univ. Grenoble Alpes, Institut des Géosciences de l'Environnement (IGE), Grenoble, France
  • anow at: Institut für Umweltphysik (IUP), Heidelberg University, Heidelberg, Germany

Abstract. We present the first comparison of carbon monoxide (CO) measurements performed with a portable laser spectrometer that exploits the optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) technique, against a high-performance automated gas chromatograph (GC) with a mercuric oxide reduction gas detector (RGD). First, measurements of atmospheric CO mole fraction were continuously collected in a Paris (France) suburb over 1 week. Both instruments showed an excellent agreement within typically 2ppb (part per billion in volume), fulfilling the World Meteorological Organization (WMO) recommendation for CO inter-laboratory comparison. The compact size and robustness of the OF-CEAS instrument allowed its operation aboard a small aircraft employed for routine tropospheric air analysis over the French Orléans forest area. Direct OF-CEAS real-time CO measurements in tropospheric air were then compared with later analysis of flask samples by the gas chromatograph. Again, a very good agreement was observed. This work establishes that the OF-CEAS laser spectrometer can run unattended at a very high level of sensitivity ( < 1ppb) and stability without any periodic calibration.

Publications Copernicus
Short summary
We present a comparison of CO measurements performed with a portable OF-CEAS laser spectrometer against a high-performance gas chromatograph. For both surface and airborne measurements, the instruments show an excellent agreement very close to the 2 ppb World Meteorological Organization recommendation for CO inter-laboratory comparison. This work establishes that this laser technique allows for the development of sensitive, compact, robust and reliable instruments for in situ trace-gas analysis.
We present a comparison of CO measurements performed with a portable OF-CEAS laser spectrometer...