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Revision as of 19:20, 30 September 2005 edit82.32.234.90 (talk)No edit summary← Previous edit Revision as of 19:32, 30 September 2005 edit undoWilliam M. Connolley (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers66,008 editsm Glad you agree; but comments on the talk page pleaseNext edit →
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GWP is based on a number of factors, including the radiative efficiency (heat-absorbing ability) of each gas relative to that of carbon dioxide, as well as the decay rate of each gas (the amount removed from the atmosphere over a given number of years) relative to that of carbon dioxide . The ] (IPCC) provides the generally accepted values for GWP, which changed slightly between 1996 and 2001 (eg methane was assessed a value of 21 in 1996). An exact definition of how GWP is calculated is to be found in the IPCC's . GWP is based on a number of factors, including the radiative efficiency (heat-absorbing ability) of each gas relative to that of carbon dioxide, as well as the decay rate of each gas (the amount removed from the atmosphere over a given number of years) relative to that of carbon dioxide . The ] (IPCC) provides the generally accepted values for GWP, which changed slightly between 1996 and 2001 (eg methane was assessed a value of 21 in 1996). An exact definition of how GWP is calculated is to be found in the IPCC's .

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Note that a substances GWP depends also on the timespan over which the potential is calculated. Thus methane has a potential of 23 over 100 years but 62 over 20 years; conversely SF6 has a GWP of 22,000 over 100 years but 15,100 over 20 years. Note that a substances GWP depends also on the timespan over which the potential is calculated. Thus methane has a potential of 23 over 100 years but 62 over 20 years; conversely SF6 has a GWP of 22,000 over 100 years but 15,100 over 20 years.

Revision as of 19:32, 30 September 2005

It has been suggested that this article be merged into greenhouse gas. (Discuss)

Global warming potential (GWP) is a measure of how much a given mass of greenhouse gas is estimated to contribute to global warming. It is a relative scale which compares the gas in question to that of the same mass of carbon dioxide whose GWP is one.

GWP is based on a number of factors, including the radiative efficiency (heat-absorbing ability) of each gas relative to that of carbon dioxide, as well as the decay rate of each gas (the amount removed from the atmosphere over a given number of years) relative to that of carbon dioxide . The Intergovernmental Panel on Climate Change (IPCC) provides the generally accepted values for GWP, which changed slightly between 1996 and 2001 (eg methane was assessed a value of 21 in 1996). An exact definition of how GWP is calculated is to be found in the IPCC's 2001 Third Assessment Report.

Note that a substances GWP depends also on the timespan over which the potential is calculated. Thus methane has a potential of 23 over 100 years but 62 over 20 years; conversely SF6 has a GWP of 22,000 over 100 years but 15,100 over 20 years.

Examples:

100 year horizons:

External links

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