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During a 2016 field expedition to the West Greenland Ice Sheet, a striking observation of significantly elevated CH 4  concentrations of up to 15 times the background atmospheric concentration were measured directly in the air expelled with meltwater at a subglacial discharge point from the Greenland Ice Sheet. The range of hourly subglacial CH 4  flux rate through the discharge point was estimated to be 3.1 to 134 g CH 4  hr −1 . These measurements are the first observations of direct emissions of CH 4  from the subglacial environment under the Greenlandic Ice Sheet to the atmosphere and indicate a novel emission pathway of CH 4  that is currently a non-quantified component of the Arctic CH 4  budget.

First observation of direct methane emission to the atmosphere from the subglacial domain of the Greenland Ice Sheet