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Near-Surface Concentration of CH4, СО2, СО, and δ13C–СH4 in the Air Based on the Observations at the Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, in Moscow
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Near-Surface Concentration of CH4, СО2, СО, and δ13C–СH4 in the Air Based on the Observations at the Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, in Moscow
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Near-Surface Concentration of CH4, СО2, СО, and δ13C–СH4 in the Air Based on the Observations at the Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, in Moscow
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Journal Article
Near-Surface Concentration of CH4, СО2, СО, and δ13C–СH4 in the Air Based on the Observations at the Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, in Moscow
2023
Overview
Results of the analysis of interannual, seasonal, and diurnal variations in the ratios of the mixture of CH
4
, CO
2
, CO, benzene, and δ13C–CH
4
in the surface air of Moscow based on the measurements at the station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences (IAP RAS), in 2018–2020 are presented. The annual maximum concentration of CH
4
, CO
2
, and CO (>2.2, 430, and 0.20 ppm, respectively) occurs in the winter months due to the seasonal increase in the anthropogenic load from the main sources of urban pollution: motor transport and thermal power plants and a decrease in the role of vertical air mixing. The greatest contribution of local and remote microbial sources to the CH
4
concentration is noted in the summer months against the background of low δ13C–CH
4
values (–50 to –60‰). In all seasons, CH
4
, CO
2
, and CO ground level peaks lasting up to several hours are due to the transport from industrial sites in the E–SE sector. The calculated mean emission ratios in urban air were CH
4
/benzene = 0.52–0.54 ppm/ppb, CH
4
/СО = 0.56–0.75 ppm/ppm, CO
2
/benzene = 77–93 ppm/ppb, CO
2
/СО = 81–131 ppm/ppm, and CO/benzene = 0.65–1.11 ppm/ppb. These ratios characterize the predominant contribution of emissions from motor transport and the heat and power equipment and can be used to refine the absolute values of emissions, including those on the basis of existing inventories of sources of anthropogenic air pollution.
