Encyclopedia of Geobiology

2011 Edition
| Editors: Joachim Reitner, Volker Thiel

Methane, Origin

  • Carsten J. Schubert
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-9212-1_138

Definition

Methane is a colorless and odorless gas, with the chemical formula CH4. Due to its radiative force, it is a strong greenhouse gas and contributes to the warming of the earth. It is formed in the environment by methanogenesis. The main natural sources are wetlands and termites (30% of total emissions), while anthropogenic sources include rice fields, cattle farming, and energy production (70% of total emissions).

General aspects

Methane is a colorless and odorless gas and the major component (97% vol.) of natural gas. Methane has a boiling point of −161°C at a pressure of one atmosphere. As a gas, it is flammable only over a narrow range of concentrations (5–15%) in air. It is mainly produced by microorganisms (methanogens) under anoxic conditions in a process called methanogenesis. These conditions exist under water-covered soils, such as rice paddies, tundra, swamps, and marshes, but also in freshwater and marine sediments. Other anoxic environments include ruminant...

Keywords

Rice Field Methane Emission Carbon Isotopic Composition Atmospheric Methane Hydrogen Isotopic Composition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Carsten J. Schubert
    • 1
  1. 1.Eawag, Swiss Federal Institute of Aquatic Science and TechnologyKastanienbaumSwitzerland