Atmospheric CO along the Trans-Siberian Railroad and River Ob: source identification using isotope analysis |
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| Authors: | O A Tarasova C A M Brenninkmeijer S S Assonov N F Elansky T Röckmann M A Sofiev |
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| Institution: | (1) Atmosphere Physics Department, Moscow State University, Lebedeva str., 2, 119992 Moscow, Russia;(2) Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Joh-Joachim-Becher-Weg 27, 55128 Mainz, Germany;(3) Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevsky per. 3, 109017 Moscow, Russia;(4) Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, 3508 TA Utrecht, The Netherlands;(5) Atmospheric Physics Department, Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany;(6) Finnish Meteorological Institute, Erik Palminen Aukio 1, 00560 Helsinki, Finland |
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| Abstract: | The concentration, radiocarbon (14C) and stable isotope (13C and 18O) content of CO have been determined in air samples collected across Russia (about 8,500 km) and along the Ob river during
the summer of 1999 to study the CO sources and sinks. An instrumented carriage on the Trans-Siberian railway and a boat on
the river Ob were used as atmospheric measurement platforms. In general, CO mixing ratios, CO stable isotope ratios, as well
as the abundances of 14CO over West Siberia were similar to those found at remote northern hemispheric baseline monitoring stations. Identified sources
of CO along the Ob appear to be connected to methane oxidation based on an inferred δ13Csource = −36.8 ± 0.6‰, while the value for δ18Osource = 9.0 ± 1.6‰ identifies it as burning. Thus flaring in the oil and gas production can be supposed to be a source. The extreme
13C depletion and concomitant 18O enrichment for two of the boat samples unambiguously indicates contamination by CO from combustion of natural gas (inferred
values δ13Csource = −40.3‰ and δ18Osource = 17.5‰). For these two samples, that have strongly elevated 14CO concentrations, the industrial area near Tomsk is identified as a source area using meteorological calculations. Along
the Trans-Siberian Railroad background CO was to various degrees contaminated with CO from methane combustion (δ13Csource = −35.7 ± 6.2‰ and δ18Osource = 10.3 ± 1.8‰). The impact of industrial burning was discernable in the vicinity of Perm-Kungur. |
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| Keywords: | Carbon monoxide Isotopes Radiocarbon River Ob Russia |
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