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|Title:||Seasonal and Latitudinal Variation of Atmospheric Methane: a Ground-based and Ship-borne Solar IR Spectroscopic Study|
|Authors:||WARNEKE Thorsten; MEIRINK Jan Fokke; BERGAMASCHI PETER; GROOSS J.-U.; NOTHOLT Justus; TOON G.c.; VELAZCO V.; GOEDE Albert; SCHREMS O.|
|Citation:||GEOPHYSICAL RESEARCH LETTERS vol. 33 no. 14812|
|Type:||Articles in periodicals and books|
|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 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.|
|JRC Institute:||Institute for Environment and Sustainability|
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