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

T Warneke, J.F. Meirink, P. Bergamaschi, J.U. Grooss, J Notholt, G.C. Toon, V. Velazco, A.P.H. Goede, O. Schrems

Research output: Contribution to journalArticleAcademicpeer-review

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.
Original languageUndefined/Unknown
Pages (from-to)L14812/1-L14812/5
Number of pages5
JournalGeophysical Research Letters
Volume33
Publication statusPublished - 2006

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