| Summary: | The main goal of the study was to obtain new experimental data on the seasonal variability of carbon dioxide (CO2) and methane (CH4) fluxes in a subarctic palsa mire in north-central Siberia, as well as to assess the sensitivity of the CO2 and CH4 fluxes to environmental changes. The results of field measurements in 2017 and 2018 showed that the palsa mire served as a sink of CO2 from the atmosphere for the period between mid-June to the end of August for both years. Maximum daily CO2 uptake rates in 2017 were observed at the beginning of July (up to 4.5 gC m−2 d−1), mainly due to high incoming solar radiation, optimal air temperature and sufficient soil moisture conditions. Seasonal variability of CH4 fluxes was relatively high and governed mainly by weather conditions. During both growing seasons the palsa mire served mostly as a CH4 source for the atmosphere. The periods with prevailed CH4 emission alternated with periods of CH4 uptake and the fluxes varied between −8.3 to 13.6 mgC m−2 per day in 2017 and between −4.5 to 21.8 mgC m−2 per day in 2018.
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