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We present the CH4 concentration [CH4], the partial pressure ofCO2 (pCO2) and the total gas content in bulk sea ice from subarctic,land-fast sea ice in the Kapisillit fjord, Greenland. Fjord systems arecharacterized by freshwater runoff and riverine input and based on δ18O data, we show that > 30% of the surface wateroriginated from periodic river input during ice growth. This resulted infresher sea-ice layers with higher gas content than is typical from marinesea ice. The bulk ice [CH4] ranged from 1.8 to 12.1 nmol L−1,which corresponds to a partial pressure ranging from 3 to 28 ppmv. This ismarkedly higher than the average atmospheric methane content of 1.9 ppmv.Evidently most of the trapped methane within the ice was contained insidebubbles, and only a minor portion was dissolved in the brines. The bulk icepCO2 ranged from 60 to 330 ppmv indicating that sea ice at temperaturesabove −4 °C is undersaturated compared to the atmosphere (390 ppmv).This study adds to the few existing studies of CH4 and CO2in sea ice, and we conclude that subarctic seawater can be a sink for atmosphericCO2, while being a net source of CH4

biogeosciences

CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; in sea ice from a subarctic fjord under influence of riverine input