Seasonal variations in the stable carbon isotopic signature of biogenic methane in a coastal sediment

Christopher S. Martens*, Neal E. Blair, Carol D. Green, David J. Des Marais

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Systematic seasonal variations in the stable carbon isotopic signature of methane gas occur in the anoxic sediments of Cape Lookout Bight, a lagoonal basin on North Carolina's Outer Banks. Values for the carbon isotope ratio (δ13C) of methane range from -57.3 per mil during summer to -68.5 per mil during winter in gas bubbles with an average methane content of 95%. The variations are hypothesized to result from changes in the pathways of microbial methane production and cycling of key substrates including acetate and hydrogen. The use of stable isotopic signatures to investigate the global methane cycle through mass balance calculations, involving various sediment and soil biogenic sources, appears to require seasonally averaged data from individual sites.

Original languageEnglish (US)
Pages (from-to)1300-1303
Number of pages4
JournalScience
Volume233
Issue number4770
DOIs
StatePublished - Jan 1 1986

ASJC Scopus subject areas

  • General

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