Seasonal and latitudinal variation of atmospheric methane: a ground-based and ship-borne solar IR spectroscopic study
Publication date
2006
Authors
Warneke, T
Meirink, J.F.
Bergamaschi, P.
Grooss, J.U.
Notholt, J
Toon, G.C.
Velazco, V.
Goede, A.P.H.
Schrems, O.
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Article
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Abstract
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 N–34 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 shipborne 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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Warneke, T, Meirink, J F, Bergamaschi, P, Grooss, J U, Notholt, J, Toon, G C, Velazco, V, Goede, A P H & Schrems, O 2006, 'Seasonal and latitudinal variation of atmospheric methane: a ground-based and ship-borne solar IR spectroscopic study', Geophysical Research Letters, vol. 33, pp. L14812/1-L14812/5.