Journal
ATMOSPHERIC MEASUREMENT TECHNIQUES
Volume 9, Issue 9, Pages 4737-4757Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/amt-9-4737-2016
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Funding
- MeteoSwiss through engagement in the Global Atmosphere Watch programme
- Japan Meteorological Agency
- German Max Planck Society
- University of Exeter, UK
- NERC [NE/N015932/1] Funding Source: UKRI
- Natural Environment Research Council [NE/N015932/1] Funding Source: researchfish
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Until recently, atmospheric carbon dioxide (CO2) and methane (CH4) measurements were made almost exclusively using nondispersive infrared (NDIR) absorption and gas chromatography with flame ionisation detection (GC/FID) techniques, respectively. Recently, commercially available instruments based on spectroscopic techniques such as cavity ring-down spectroscopy (CRDS), off-axis integrated cavity output spectroscopy (OA-ICOS) and Fourier transform infrared (FTIR) spectroscopy have become more widely available and affordable. This resulted in a widespread use of these techniques at many measurement stations. This paper is focused on the comparison between a CRDS travelling instrument that has been used during performance audits within the Global Atmosphere Watch (GAW) programme of the World Meteorological Organization (WMO) with instruments incorporating other, more traditional techniques for measuring CO2 and CH4 (NDIR and GC/FID). We demonstrate that CRDS instruments and likely other spectroscopic techniques are suitable for WMO/GAW stations and allow a smooth continuation of historic CO2 and CH4 time series. Moreover, the analysis of the audit results indicates that the spectroscopic techniques have a number of advantages over the traditional methods which will lead to the improved accuracy of atmospheric CO2 and CH4 measurements.
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