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Atmospheric Methane: Image of the Day

Methane is an important trace gas in Earth's atmosphere. Even though it only makes up 0.00017% (1.7 parts per million by volume) of the the atmosphere, methane traps a significant amount of heat, helping the planet remain warm and habitable. The amount of methane in the atmosphere is the result of a balance between production on the surface and destruction in the atmosphere. Methane forms when organic matter decomposes in oxygen-poor environments, such as marshes, rice paddies, or the digestive systems of cattle. It also comes from combustion (burning) of carbon-based fuels. These maps show the distribution of methane at the surface (top) and in the stratosphere (lower), calculated by a NASA computer model. Concentrations are shown in parts per million by volume. Methane is created near the surface, and it is carried into the stratosphere by rising air in the tropics. Uncontrolled build-up of methane in Earth's atmosphere is naturally checked -- although human influence can upset this natural regulation -- by methane's reaction with a molecule known as the hydroxyl radical, a hydrogen-oxygen molecule formed when single oxygen atoms react with water vapor. Early in the Earth's histo

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