Abstract
The concentration and isotopic composition of carbon monoxide have been determined on 20 large air samples collected in Russia in April 1997, using the Trans-Siberian Railroad as measurement platform. The data, in connection with a high resolution CO concentration record that was obtained in situ on the train, provide a snapshot of the CO inventory along the transect during early spring. Over large parts of the extended Asian landmass, CO mixing ratios, as well as δ13C, δ18O and 14CO values are close to levels found at remote northern hemispheric baseline locations. Superimposed on this background, we observe a large scale CO elevation over the European part of Russia, as well as frequent episodes of anthropogenic contamination and biomass burning plumes on local to regional scales.
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