Vol. 36, issue 10, article # 6

Abstract:

Contribution of anthropogenic and wetland methane emissions in North Eurasia (> 40°N) and Russia into the near-surface CH₄ abundance at ZOTTO, Teriberka, and Tixi measurement sites is quantified using GEOS-chem global chemical-transport model. Numerical results agree well with the proposed semi-analytical solution, in which the total response in the CH₄ level at a given site is represented as the sum of direct (synoptic) and global terms. The annual average direct contribution of Russian anthropogenic emissions into CH₄ mixing ratio measured at ZOTTO (38.6 ppbv) is twice as large as that for Western Europe sources (17.7 ppbv). For the Arctic sites, the anthropogenic input from Russian and European anthropogenic sources is roughly similar (19.5 ppbv and 12.4 ppbv, correspondingly). The input from continental sources into methane abundance and its annual variability at the Arctic sites are generally lower compared to those at the ZOTTO site due to larger transport times from upstream CH₄ source regions. Atmospheric responses in methane levels at the Teriberca and Tixi sites to CH₄ continental sources are found to be very close, which is explained by spatial homogenization of the anthropogenic and biogenic signals in high latitudes.

Keywords:

methane, troposphere, Central Siberia, Arctic, regional CH4 sources, WetCHARTs, EDGAR, ТХМ GEOS-Chem, atmospheric transport

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