Особенности многолетних изменений и сезонной изменчивости современных фоновых концентраций CO2, СН4 и N2O на станциях глобального мониторинга

Фундаментальная и прикладная климатология. 2018. Т. 4. С. 71–87.

Semenov S., Ранькова Э. Я.

Monthly data on concentrations of carbon dioxide CO2, methane CH4 and nitrous oxide N2O from 11 stations of the CSIRO GASLAB Flask Sampling Network are used. The stations monitor background concentrations in the surface layer of the atmosphere. Multiyear variability is studied with the time series of 12months running averages. Seasonal variability is examined using differences of series of bimestrial running averages and 12-months running averages. Close similarity of the long-term trends has been found for each gas. The time series of seasonal deviations from stations situated at different extratropical latitudes, after adjustment for respective seasonal shifts, also reveal strong correlation for СН4 and СО2, but not for N2O. The results support the hypothesis that seasonal variations of solar radiation flux in the lower atmosphere is the leading factor of seasonal variability of СН4 and СО2 concentrations. Seasonal increase in the flux causes the enhancement of CO2 photosynthetic uptake by terrestrial and ocean plants. Simultaneously, the level of hydroxyl in the atmosphere increases, that leads to intensification of methane depletion in the troposphere.

Keywords: carbon dioxide, long-term changes, methane, сходство, NITROUS OXIDE, GLOBAL MONITORING STATIONS, SIMILARITY, SEASONAL VARIATIONS, УГЛЕКИСЛЫЙ ГАЗ, МЕТАН, ЗАКИСЬ АЗОТА, СТАНЦИИ ГЛОБАЛЬНОГО МОНИТОРИНГА, МНОГОЛЕТНИЕ ИЗМЕНЕНИЯ, СЕЗОННЫЕ ВАРИАЦИИ