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    Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations

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    Date
    2016-09-26
    Author
    Zellweger, Christoph
    Emmenegger, Lukas
    Firdaus, Mohd
    Hatakka, Juha
    Heimann, Martin
    Kozlova, Elena
    Spain, T. Gerard
    Steinbacher, Martin
    van der Schoot, Marcel V.
    Buchmann, Brigitte
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    Cited 20 times in Scopus (view citations)
    
    Recommended Citation
    Zellweger, Christoph; Emmenegger, Lukas; Firdaus, Mohd; Hatakka, Juha; Heimann, Martin; Kozlova, Elena; Spain, T. Gerard; Steinbacher, Martin; van der Schoot, Marcel V. Buchmann, Brigitte (2016). Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations. Atmospheric Measurement Techniques 9 (9), 4737-4757
    Published Version
    https://www.atmos-meas-tech.net/9/4737/2016/amt-9-4737-2016.pdf
    Abstract
    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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    http://hdl.handle.net/10379/14518
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