RIS ID
45991
Abstract
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.
Included in
Life Sciences Commons, Physical Sciences and Mathematics Commons, Social and Behavioral Sciences Commons
Publication Details
Warneke, T., Yang, Z., Olsen, S., Korner, S., Notholt, J., Toon, G. C., Velazco, V., Schulz, A. & Schrems, O. (2005). Seasonal and latitudinal variations of column averaged volume-mixing ratios of atmospheric CO2. Geophysical Research Letters, 32 (3), L03808-1-L03808-4. Copyright 2005 the American Geophysical Union.