Eddy correlation measurements of methane exchange were conducted during a period of 43 days covering the summer season in high-arctic, NE Greenland. Measurements were carried out over a fen area and showed fluxes ranging from no exchange in the early part of the campaign to 120 mg m^-2 d^-1 during midsummer. The emission showed a clear variation related to soil temperatures and water table level in the late part of the summer, whereas the thickness of the active soil layer was a main controlling parameter in the thaw period, in the early part of the season. A model to assess methane emission dependency on physical parameters is found to give a realistic estimate for the seasonal variations in flux. The proportion of C returned to the atmosphere as CH₄ relative to the total C cycling was around 2%, which is similar to ratios often reported in literature. On the basis of these findings, an estimate is given for the total summer season emission of CH₄, in which a simple model including both physical parameters and net primary production (NPP) is adapted to reproduce CH₄ exchange rates for periods when no measurements were undertaken. In this way the total emission of CH₄ during the period June 1 to September 1 1997, is found to equal 3.7 ± 0.57 g m^-2, which is a relatively high rate given the harsh climate in which the measurements were made.