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

Warneke, T.; Meirink, J. F.; Goede, A.P.H.; Grooß, J.-U.; Velazco, V.; Schrems, O.; Notholt, J.; Toon, G. C.; Begamaschi, P.

doi:10.1029/2006GL025874

Journal Article

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

Warneke, T. ; Meirink, J. F. ; Begamaschi, P. ; Grooß, J.-U.FZJ* ; Notholt, J. ; Toon, G. C. ; Velazco, V. ; Goede, A. P. H. ; Schrems, O.

2006
American Geophysical Union Washington, DC

Geophysical research letters 33, L14812 (2006) [10.1029/2006GL025874]

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Please use a persistent id in citations: http://hdl.handle.net/2128/20802 doi:10.1029/2006GL025874

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 degrees N) between 1997 and 2004 and during two ship cruises (54 degrees N - 34 degrees 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 degrees N and 34 degrees S is in agreement with inverse model simulations which are optimized vs. the global NOAA/ESRL measurements.

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