This dataset includes campaign-based, manual chamber measurements at sites displaying net methane (CH4) uptake. These manual measurements were conducted during the growing season at typical, well-drained upland sites, which included, besides Trail Valley Creek, three additional sites in the Canadian and European Arctic (Havikpak Creek, Scotty Creek, Kilpisjärvi). Besides CH4 flux observations, the dataset contains measured greenhouse gas concentration profiles of CH4, carbon dioxide (CO2) and nitrous oxide (N2O) at 2 cm, 5 cm, 10 cm, and 20 cm soil depths, as well as site meteorological data.

Further funding awards: NSERC Discovery Grants program (DGPIN-2018-05743 and RGPIN-2022-05347), Atmosphere and Climate Competence Center (ACCC, no. 337550), Northern Water Futures (Global Water Futures, Canada First Research Excellence Fund's Global Water Futures program, doi:10.13039/501100013380), Polar Continental Shelf Program (608-20, 602-21)Dates are given in local timezone, which are:- Canadian sites (Trail Valley Creek, Havikpak Creek, Scotty Creek): times in MST = Mountain standard time (no daylight saving time), i.e. UTC-07- Finnish sites (Kilpisjärvi): Eastern European Summer Time, i.e. UTC+03