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Seasonal an latitudinal variations of column averaged volume mixing ratios of atmospheric CO2

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Warneke, T. , Yang, Z. , Olsen, S. , Körner, S. , Notholt, J. , Toon, G. C. , Velazco, V. , Schulz, A. and Schrems, O. (2005): Seasonal an latitudinal variations of column averaged volume mixing ratios of atmospheric CO2 , Geophysical research letters, 32, L03808 . doi: 10.1029/2004GL021597, 2005
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Column-averaged volume mixing ratios of CO2 have been obtained by ground based high-resolution solar absorption spectrometry at Ny-Alesund (Spitsbergen, 79°N) in 20022003 and during two ship cruises (54°N34°S) on the Atlantic in 2003. Precisions are better than 0.4% at Ny-Alesund and better than 0.6% for the cruises. The observed 11 ppmv (part per million by volume) seasonal amplitude of the CO2 column at Ny-Alesund is about 5 ppmv smaller than surface in situ data and 24 ppmv greater than model-predictions. The latitudinal gradient of column CO2 inferred from shipborne measurements is less than 2 ppmv in Oct/Nov 2003. During the cruise in Jan/Feb 2003 the observed latitudinal variation is about 7 ppmv. This strong variation is caused by pollution events (biomass burning) and natural variations. Low CO2 columns observed between 5°S15°S are attributed to a strong seasonal amplitude of CO2 over Central Africa.

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