Home – Home – Jornals – Atmospheric and Oceanic Optics 2026 number 8

The ongoing global warming requires increased attention to the dynamics of greenhouse gas concentrations in the atmosphere, which is not sufficiently studied. In this paper, the variability of CO₂ and CH₄ concentrations on the meso-α-scale (200-2000 km) was analyzed based on hourly observation from 2013 to 2017 at six stations of the JR-STATION network for greenhouse gas monitoring, established within the Russian-Japanese scientific cooperation. The absolute differences in hourly concentrations between adjacent observation sites are discussed. It is shown that the long-term average | ΔСО₂ | can vary from 3.8 to 4.5 ppm, and | ΔСН₄ |, from 47 to 105 ppb. The gradients of CO₂ concentrations in Western Siberia on the meso-α-scale were in the range 0.006-0.007 ppm/km, and of CH₄, in the range 0.077-0.179 ppb/km, which were significantly less than those on the meso-β (20-200 km) and meso-γ (2-20 km) scales. Aannual cycle of the average long-term absolute differences in CO₂ concentrations between all stations is charactarized by a minimum in March-April, and a maximum in June-August. Their minima were ≈ 2 ppm, while their maxima ranged from 6 to 9 ppm. In the daily cycle, the maxima of the long-term average absolute differences in CO₂ and CH₄ concentrations were observed in darkness, while the minima were observed during the daylight and varied throughout the year. They remained nearly constant during the day from October to April. Nighttime differences become to be distinguishable in May, reaching maxima in July and August. A decrease is then observed in September. The results of this study expand our knowledge of greenhouse gas dynamics in the atmosphere on the meso-α-scale and can be useful in developing requirements for both measurement accuracy and the scaling of atmospheric budget calculations.