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 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.
WARNEKE Thorsten;
MEIRINK Jan Fokke;
BERGAMASCHI Peter;
GROOSS J.U.;
NOTHOLT Justus;
TOON G.C.;
VELAZCO V.;
GOEDE Albert;
SCHREMS O.;
2006-09-15
JRC34076
https://publications.jrc.ec.europa.eu/repository/handle/JRC34076,
10.1029/2006GL025874,
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