A Fourier transform infrared trace gas analyser for atmospheric applications
Author:
Griffith D. W. T.,Deutscher N. M.,Caldow C. G. R.,Kettlewell G.,Riggenbach M.,Hammer S.
Abstract
Abstract. Concern in recent decades about human impacts on Earth's climate has led to the need for improved and expanded measurement capabilities for greenhouse gases in the atmosphere. In this paper we describe in detail an in situ trace gas analyser based on Fourier Transform Infrared (FTIR) spectroscopy that is capable of simultaneous and continuous measurements of carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), nitrous oxide (N2O) and 13C in CO2 in air with high precision and accuracy. Stable water isotopes can also be measured in undried airstreams. The analyser is automated and allows unattended operation with minimal operator intervention. Precision and accuracy meet and exceed the compatibility targets set by the World Meteorological Organisation – Global Atmosphere Watch Programme for baseline measurements in the unpolluted troposphere for all species except 13C in CO2. The analyser is mobile and well suited to fixed sites, tower measurements, mobile platforms and campaign-based measurements. The isotopic specificity of the optically-based technique and analysis allows application of the analyser in isotopic tracer experiments, for example 13C in CO2 and 15N in N2O. We review a number of applications illustrating use of the analyser in clean air monitoring, micrometeorological flux and tower measurements, mobile measurements on a train, and soil flux chamber measurements.
Publisher
Copernicus GmbH
Reference50 articles.
1. Allan, D.: Statistics of atomic frequency standards, Proc. IEEE, 54, 221–230, 1966. 2. Anderson, R. J. and Griffiths, P. R.: Errors in absorbance measurements in infrared Fourier transform spectrometry because of limited instrument resolution, Anal. Chem., 47, 2339–2347, 1975. 3. Cohen, E. R., Cvitas, T., Frey, J. G., Holmstroem, B., Kuchitsu, K., Marquardt, R., Mills, I., Pavese, F., Quack, M., Stohner, J., Strauss, H. L., Takami, M., and Thor, A. J.: Quantities, Units and Symbols in Physical Chemistry, IUPAC, RSC Publishing, Cambridge, 2007. 4. Coplen, T. B.: Explanatory glossary of terms used in expression of relative isotope ratios and gas ratios, IUPAC, 27, available at: http://old.iupac.org/reports/provisional/abstract08/coplen_prs.pdf (last access: 16 January 2012), 2008. 5. Davis, S. P., Abrams, M. C., and Brault, J. W.: Fourier Transform Spectrometry, Academic Press, San Diego, 2001. \\clearpage
Cited by
11 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|