Opposing Responses of Carbon Dioxide and Methane Fluxes Following Thermokarst Erosion Across Tundra-Lake Interfaces in the Western Canadian Arctic

This dataset contains carbon dioxide, methane, and nitrous oxide fluxes measured ~weekly over two snow-free seasons (June–August; 2022, 2023) from tundra and thermokarst lakes at Trail Valley Creek, an Arctic tundra site in the Western Canadian Arctic. Fluxes were measured with manual chambers at microsites in replication of four within five sampling zones across three tundra-lake interface sites (e.g., BB, KI, LB) impacted by ongoing thermokarst erosion. Sample location naming hierarchy is site>sampling zone>microsite. Accompanying datasets include (1) lake depth profiles measured at the approximate center of each lake at weekly intervals in July 2023, (2) soil properties from fresh and dried soil samples collected in August 2024, and (3) carbon dioxide, methane, and nitrous oxide fluxes synthesized from published literature in undisturbed tundra and lake ecosystems in the Arctic boreal region. We gratefully acknowledge community organizations in the Inuvialuit Settlement region who permitted this work to occur within their traditional territory. The research licenses (no. 16781, 17017, 17272, 17497) were administered by the Government of the Northwest Territories, NT, Canada.