The EddyFen station measures carbon dioxide- and methane fluxes via eddy covariance method in a low Arctic fen site (40 m.a.s.l) close to InteractFen (Meteorology, Soil Properties, Snow Properties; 2011-) and SoilFen (Meteorology, Soil Properties; 2007-) and the former station AutochambersFen (Flux Monitoring; 2007-2021). The station was established in 2007 and originally instrumented with a LI7000 CO2/H2O analyzer and Gill 1210R3 sonic anemometer (2007-2018). In 2018 the station was relocated a few meters and upgraded with a LI7200RS closed-path gas analyzer and a SmartFlux2 processing system (2018-). The Gill HS-50 sonic anemometer replaced the previous model in 2019 (2019-), and an LI7700 open-path CH4 Analyzer was added in 2024 (2024-). Due to the relocation in 2018, the CO2 flux time series are divided into two datasets (pre-2018 and post-2018). This dataset contains quality-controlled fluxes of CO2, LE and H; CO2- and H2O concentrations; friction velocity; wind speed and -direction from 2018 onwards. In 2021 the station was labelled ICOS (Integrated Carbon Observation System) associated, and data are processed following ICOS standards, with a logging frequency of 20 Hz and aggregated as 30-minute averages (UTC-3 West Greenlandic Winter Time). From 2007 to 2023, data were collected only during the summer field season (approximately MayâOctober) due to winter power limitations. Since 2024, continuous year-round data collection has been enabled, though occasional data gaps remain in the dark months from November to February. Pre-2018 time series containing CO2 flux data is available under the dataset under "EddyFen" and CH4 fluxes are expected to be made available as a separate dataset soon.
