Methane Accumulation and Release from Deep Peat: Measurements, Conceptual Models, and Biogeochemical Significance

Paul H. Glaser, Jeffrey P. Chanton

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations

Abstract

Northern peatlands account for more than half the world's wetlands but are currently estimated to contribute only about a third of the total methane emissions from all wetlands. Increasing data on the dynamics of methane gas bubbles in peat deposits now suggest that these estimates may need to be scaled upward. Rates of methanogenesis may remain high in deep peat strata because of the downward transport of labile root exudates permitting the widespread production of gas bubbles. Recent investigations using an array of methods have reported free-phase gas volumes of 10-20% within both deep and shallow peat strata and episodic ebullition fluxes exceeding 35 g CH4 m-2 per event. Gas bubbles accumulate in overpressured pockets that episodically rupture in response to steep declines in atmospheric pressure or declining water tables. Although these ebullition fluxes are highly variable in both time and space, they appear to dominate the annual methane emissions from northern peatlands and represent a major and underappreciated element of the global methane cycle.

Original languageEnglish (US)
Title of host publicationCarbon Cycling in Northern Peatlands
PublisherAmerican Geophysical Union
Pages145-158
Number of pages14
ISBN (Electronic)9781118666661
ISBN (Print)9780875904498
DOIs
StatePublished - Mar 19 2013

Keywords

  • Carbon cycle (Biogeochemistry)-Northern Hemisphere
  • Carbon sequestration-Northern Hemisphere
  • Greenhouse gases-Northern Hemisphere
  • Peatlands-Environmental aspects-Northern Hemisphere

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