Peculiarities of the vertical distribution of carbon dioxide over Southwestern Siberia in the summer season
M.Yu. Arshinov1, B.D. Belan1, D.K. Davydov1, O.A. Krasnov1, Sh. Macsyutov2, T. Machida2, M. Sasakawa2, A.V. Fofonov1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
2Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, 305-8506, Tsukuba, Japan
Keywords: атмосфера, вертикальное распределение, воздух, газ, летний период, углекислый газ, atmosphere, vertical distribution, air, gas, summer period, carbon dioxide
Abstract
The long-term variability of carbon dioxide concentration at different altitudes during the summer period is analyzed on the basis of data of aircraft sounding over Southwestern Siberia. The monitoring data show that summer values of carbon dioxide concentration at an altitude of 7.0 km grew with a rate of 1.90 ppm/year over the region under study. In the atmospheric boundary layer, the CO2 concentration grew insignificantly during summer periods from 1997 to 2004 (0.32 ppm/year). Form 2005 to 2017 inclusive, the growth rate sharply increased and was 2.55 ppm/year. The analysis of possible causes of such long-term behavior has shown that it is not due to reduction of the area of forests, wildfires, or diseases of trees. It is also impossible to assert that the carbon dioxide sink was caused by the impact of climatic parameters on forest vegetation. It is probable that the amount of carbon dioxide accumulated in the atmosphere by 2004 makes impossible its further absorption by Siberian forests.
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