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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 7, 3295-3305, 2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
06 Oct 2014
Retrieval of tropospheric column-averaged CH4 mole fraction by solar absorption FTIR-spectrometry using N2O as a proxy
Z. Wang1, N. M. Deutscher1,2, T. Warneke1, J. Notholt1, B. Dils3, D. W. T. Griffith2, M. Schmidt4, M. Ramonet4, and C. Gerbig 1Institute of Environmental Physics, University of Bremen, Germany
2School of Chemistry, University of Wollongong, Wollongong, Australia
3Belgian Institute for Space Aeronomy, Brussels, Belgium
4Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Gif-Sur-Yvette, France
Abstract. Tropospheric column-averaged CH4 mole fractions were derived from ground-based column absorption measurements. The method uses stratospheric N2O columns to correct for the stratospheric contribution to the CH4 total column. The method was applied to four Total Carbon Column Observing Network (TCCON) sites covering locations from the Northern Arctic to the tropics. It performs well for all sites. The derived tropospheric CH4 concentrations were compared with profiles measured by aircraft at three sites. The results indicate an inter-site consistency within 6 ppb (~0.3%). With aircraft profiles up to 3 km, the seasonal behavior of the derived tropospheric CH4 concentration was also checked, revealing a difference of around 20 ppb. The mean relative uncertainty of the four sites, as estimated from the daily standard deviations, is 0.23%.

Citation: Wang, Z., Deutscher, N. M., Warneke, T., Notholt, J., Dils, B., Griffith, D. W. T., Schmidt, M., Ramonet, M., and Gerbig, C.: Retrieval of tropospheric column-averaged CH4 mole fraction by solar absorption FTIR-spectrometry using N2O as a proxy, Atmos. Meas. Tech., 7, 3295-3305, doi:10.5194/amt-7-3295-2014, 2014.
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