Abstract
We present measurement data from February 1998 to January 2014 obtained by Fourier spectroscopy for bulk methane concentrations in surface air samples. We have excluded the results of individual measurements of high methane concentrations arising at a temperature inversion and during fires to separate the monthly mean concentrations into the regional natural background concentration of methane and its anthropogenic addition. A seasonal concentration has been separated from the background concentration. Spectral analysis reveals a large number of composite oscillations of variations in the background methane concentra- tion with periods of 3 to 126 months. A model with the use of empirical parameters of these oscillations describes the temporal changes in the methane concentration with an error of less than 3%. The anthropogenic addition of CH4 in the atmosphere is largely of a random character. Over 16 years of observations, its increase was ~23.7 ppb, which has resulted in an increase in the total CH4 concentration by the same amount.
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Original Russian Text © V.N. Aref’ev, R.M. Akimenko, F.V. Kashin, L.B. Upenek, 2016, published in Izvestiya AN. Fizika Atmosfery i Okeana, 2016, Vol. 52, No. 1, pp. 42–50.
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Aref’ev, V.N., Akimenko, R.M., Kashin, F.V. et al. Background component of methane concentration in surface air (Obninsk monitoring station). Izv. Atmos. Ocean. Phys. 52, 37–44 (2016). https://doi.org/10.1134/S0001433815060031
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DOI: https://doi.org/10.1134/S0001433815060031