Soil-atmosphere greenhouse gas fluxes in the meadow of a background area of the Tomsk region (West Siberia)
M.Yu. Arshinov, B.D. Belan, D.K. Davydov, A.V. Kozlov, A.V. Fofonov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: atmosphere, air, nitrogen dioxide, sulfur dioxide, carbon dioxide, methane, ozone, nitrogen oxide, carbon monoxide, flux
Abstract
The work is devoted to the study of the dynamics of greenhouse gas flows, which were measured from 2017 to 2021 at the Background Observatory of Institute of Atmospheric Optics SB RAS. It is shown that the annual average SO2 flows at the observatory varied from -283 mg × m-2 × h-1 (runoff) to +31 mg × m-2 × h-1 (emission). The minimum emission of 1351 mg × m-2 × h-1 was recorded in 2019 and the maximum emission of 1789 mg × m-2 × h-1 in 2021. The lowest runoff was observed in 2017 (2099 mg × m-2 × h-1). The largest, equal to 2304 mg × m-2 × h-1, was in 2018. The annual average methane fluxes ranged from -0.032 mg × m-2 × h-1 in 2018 to -0.047 mg × m-2 × h-1 in 2020. The maximum methane emission was recorded in 2018 and was equal to 0.915 mg × m-2 × h-1, and the minimum in 2021 was only 0.095 mg × m-2 × h-1. At the same time, the maximum runoff in the interannual variability varied in a narrower range from -0.241 to -0.361 mg × m-2 × h-1. Unlike SO2 and SN4, the soil of the measurement area turned out to be a weak source of N2O. The annual average fluxes of this gas were in the range 0.00-0.011 mg × m-2 × h-1. Internal maximum emissions from 0.237 to 0.301 mg × m-2 × h-1 and runoffs from -0.206 to -0.245 mg × m-2 × h-1 also changed little.
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