Preprints
https://doi.org/10.5194/egusphere-2024-1440
https://doi.org/10.5194/egusphere-2024-1440
23 May 2024
 | 23 May 2024
Status: this preprint is open for discussion.

Observations of methane net sinks in the Arctic tundra

Antonio Donateo, Daniela Famulari, Donato Giovannelli, Arturo Mariani, Mauro Mazzola, Stefano Decesari, and Gianluca Pappaccogli

Abstract. This study focuses on direct measurements of CO2 and CH4 turbulent eddy covariance fluxes in tundra ecosystems in the Svalbard Islands over a two-year period. Our results reveal dynamic interactions between climatic conditions and ecosystem activities such as photosynthesis and microbial activity. During summer, pronounced carbon uptake fluxes indicate increased photosynthesis and microbial methane consumption, while during the freezing seasons very little exchange was recorded, signifying reduced activity. The observed net summertime methane uptake is correlated with the activation and aeration of soil microorganisms, and it declines in winter due to the presence of snow cover and because of the low soil temperatures, but then rebounds during the melting period. CH4 fluxes are not significantly correlated with temperature, but are instead associated with wind velocity, suggesting that electron acceptor limitation may be stimulating methanotrophic communities. High temperature anomalies increase CO2 emissions, which may have the effect of limiting summer productivity and carbon sequestration. Positive methane fluxes (emissions) were observed during warm anomalies in winter. These findings emphasise the necessity of comprehending the dynamics of greenhouse gases in tundra ecosystems in order to mitigate climate change. Further research is required to elucidate the sources and sinks of greenhouse gases in dry tundra ecosystems.

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Antonio Donateo, Daniela Famulari, Donato Giovannelli, Arturo Mariani, Mauro Mazzola, Stefano Decesari, and Gianluca Pappaccogli

Status: open (until 10 Jul 2024)

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Antonio Donateo, Daniela Famulari, Donato Giovannelli, Arturo Mariani, Mauro Mazzola, Stefano Decesari, and Gianluca Pappaccogli
Antonio Donateo, Daniela Famulari, Donato Giovannelli, Arturo Mariani, Mauro Mazzola, Stefano Decesari, and Gianluca Pappaccogli

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Short summary
This study focuses on direct measurements of CO2 and CH4 turbulent eddy covariance fluxes in tundra ecosystems in the Svalbard Islands over a two-year period. Our results reveal dynamic interactions between climatic conditions and ecosystem activities such as photosynthesis and microbial activity. The observed net summertime methane uptake is correlated with the activation and aeration of soil microorganisms. High temperature anomalies increase CO2 and CH4 emissions.