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Review of Scientific Instruments / Volume 79 / Issue 4 / OPTICS; ATOMS AND MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Rev. Sci. Instrum. 79, 043101 (2008); http://dx.doi.org/10.1063/1.2902829 (9 pages)

Precise measurements of the total concentration of atmospheric CO2 and 13CO2/12CO2 isotopic ratio using a lead-salt laser diode spectrometer

Laurence Croizé1, Didier Mondelain1, Claude Camy-Peyret1, Marc Delmotte2, and Martina Schmidt2

1Laboratoire de Physique Moléculaire Pour l’Atmosphère et l’Astrophysique, UMR 7092 CNRS-Université Pierre et Marie Curie, Case 76, 4 Place Jussieu, 75252 Paris Cedex 05, France
2Laboratoire des Sciences du Climat et de l’Environnement, UMR 1572 CEA-CNRS-UVSQ IPSL CE Saclay, L’Orme des merisiers, Point Courrier n° 129, 91191 Gif sur Yvette Cedex, France

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(Received 5 December 2007; accepted 6 March 2008; published online 3 April 2008)

We have developed a tunable diode laser spectrometer, called SIMCO (spectrometer for isotopic measurements of CO2), for determining the concentrations of 12CO2 and 13CO2 in atmospheric air, from which the total concentration of CO2 and the isotopic composition (expressed in delta units) δ13CO2 are calculated. The two concentrations are measured using a pair of lines around 2290.1 cm−1, by fitting a line profile model, taking into account the confinement narrowing effect to achieve a better accuracy. Using the Allan variance, we have demonstrated (for an integration time of 25 s) a precision of 0.1 ppmv for the total CO2 concentration and of 0.3‰ for δ13CO2. The performances on atmospheric air have been tested during a 3 days campaign by comparing the SIMCO instrument with a gas chromatograph (GC) for the measurement of the total CO2 concentration and with an isotopic ratio mass spectrometer (MS) for the isotopic composition. The CO2 concentration measurements of SIMCO are in very good agreement with the GC data with a mean difference of Δ(CO2) = 0.16±1.20 ppmv for a comparison period of 45 h and the linearity of the concentration between the two instruments is also very good (slope of correlation: 0.9996±0.0003) over the range between 380 and 415 ppmv. For δ13CO2, the comparison with the MS data shows a larger mean difference of Δ(δ13CO2) = (−1.9±1.2)‰, which could be partly related to small residual fluctuations of the overall SIMCO instrument response.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DIRECT ABSORPTION SPECTROSCOPY
  3. INSTRUMENTAL SETUP
  4. DATA PROCESSING AND RETRIEVALS
  5. INSTRUMENT PRECISION AND TEMPORAL STABILITY
  6. COMPARISON OF SIMCO MEASUREMENTS WITH GAS CHROMATOGRAPHY AND MASS SPECTROMETRY
  7. CONCLUSION

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KEYWORDS and PACS

Keywords

atmospheric techniques, carbon compounds, chromatography, laser tuning, measurement by laser beam, remote sensing by laser beam, semiconductor lasers, spectrochemical analysis, spectrometers

PACS

  • 42.68.Kh

    Effects of air pollution

  • 42.62.Eh

    Metrological applications; optical frequency synthesizers for precision spectroscopy

  • 42.62.Fi

    Laser spectroscopy

  • 93.85.Pq

    Remote sensing in exploration geophysics

  • 82.80.Bg

    Chromatography

  • 82.80.Dx

    Analytical methods involving electronic spectroscopy

  • 07.60.Rd

    Visible and ultraviolet spectrometers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2902829

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. P. Wittke and R. H. Dicke, Phys. Rev. 103, 620 (1956).

    L. Galatry, Phys. Rev. 122, 1218 (1961).


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