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


ABSTRACT: During a 2016 field expedition to the West Greenland Ice Sheet, a striking observation of significantly elevated CH4 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 CH4 flux rate through the discharge point was estimated to be 3.1 to 134?g CH4 hr-1. These measurements are the first observations of direct emissions of CH4 from the subglacial environment under the Greenlandic Ice Sheet to the atmosphere and indicate a novel emission pathway of CH4 that is currently a non-quantified component of the Arctic CH4 budget.

SUBMITTER: Christiansen JR 

PROVIDER: S-EPMC6226494 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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

Christiansen Jesper Riis JR   Jørgensen Christian Juncher CJ  

Scientific reports 20181109 1


During a 2016 field expedition to the West Greenland Ice Sheet, a striking observation of significantly elevated CH<sub>4</sub> 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<sub>4</sub> flux rate through the discharge point was estimated to be 3.1 to 134 g CH<sub>4</sub> hr<sup>-1</sup>. These measurements are the fi  ...[more]

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