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Seasonal and latitudinal variation of atmospheric methane: A ground-based and ship-borne solar IR spectroscopic study

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Warneke, T. , Meirink, J. F. , Bergamaschi, P. , Grooß, J. U. , Notholt, J. , Toon, G. C. , Velazco, V. , Goede, A. P. H. and Schrems, O. (2006): Seasonal and latitudinal variation of atmospheric methane: A ground-based and ship-borne solar IR spectroscopic study , Geophysical research letters, 33, L14812. . doi: 10.1029/2006GL025874
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Column-averaged volume mixing ratios of CH4 were retrieved with a precision of better than 0.5% from infrared solar absorption spectra obtained at Ny-Alesund (Spitsbergen, 79°N) between 1997 and 2004 and during two ship cruises (54°N34°S) on the Atlantic in 2003. The retrieval has been performed in a spectral region available to all operational FTIR (Fourier Transform InfraRed) spectrometers performing solar absorption measurements. The seasonality and the long-term increase of the tropospheric volume-mixing ratio, derived from the infrared measurements agree well with data from surface sampling at this site. The latitudinal variation of ship-borne measurements between 54°N and 34°S is in agreement with inverse model simulations which are optimized vs. the global NOAA/ESRL measurements.

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