Greenhouse gas fluxes at boreal and arctic wetland in Alaska

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Masahito Ueyama, Hiroki Iwata, Hirohiko Nagano, Kazuhito Ichii and Yoshinobu Harazono
Book (published in): 
Proceedings of the 15th International Peat Congress
alaska, eddy covariance, greenhouse gas flux, synthesis



For evaluating long-term greenhouse gas budget, we have continuously measured CO2 and CH4 fluxes by the eddy covariance and gradient methods at boreal and Arctic wetlands in Alaska. In this study, we review our recent activities of the field measurements and synthesis based on multi-site eddy covariance measurements with satellite remote sensing. Based on a decade of measurements, an autumn warming shifted the annual CO2 balance at a peatland forest on permafrost from sink to source. CH4 fluxes at the forest played a minor role on the greenhouse gas budget. In contrast, CH4 fluxes played a major role on greenhouse gas budget at Arctic wet sedge tundra...