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Atmospheric Lifetime
The lifetime of a greenhouse gas refers to the approximate amount of time it would take for the anthropogenic increment to an atmospheric pollutant concentration to return to its natural level (assuming emissions cease) as a result of either being converted to another chemical compound or being taken out of the atmosphere via a sink. This time depends on the pollutant's sources and sinks as well as its reactivity. The lifetime of a pollutant is often considered in conjunction with the mixing of pollutants in the atmosphere; a long lifetime will allow the pollutant to mix throughout the atmosphere. Average lifetimes can vary from about a week (sulfate aerosols) to more than a century (CFCs, carbon dioxide). See residence time, greenhouse gas. (source: EPA) Technology News Daily,Methane has an atmospheric lifetime of about eight years. Carbon dioxide – the main greenhouse gas that is produced by burning fossil fuels for power Sustainable fire protection for mission-critical assets - Jul 25, 2007 Oil & Gas Engineer Magazine,Sapphire also has a remarkably low atmospheric lifetime of just five days, so does not have any appreciable impact on climate change. Infrared camera can sense sulphur hexafluoride - Apr 8, 2007 Manufacturing Talk,Flir Systems' ThermaCAM GasfindIR-LW infrared camera can sense sulphur hexafluoride (SF6), the 'Greenhouse Gas' with an estimated atmospheric lifetime of FLIR's New GasfindIR-LW Infrared Camera Can Detect "Greenhouse - Apr 9, 2007 Pollution Online (press release),It has 23900 times the global warming potential of CO2 and has an atmospheric lifetime of 3200 years. Together, the EPA and many of the major utilities Methane - The Other Greenhouse Gas - Apr 3, 2007 SciScoop,The strength and effectiveness of these sinks determine methane's atmospheric lifetime. The lion's share of anthropogenic - human induced - methane Full Text - Mar 29, 2007 Science Magazine (subscription)...on the change in the atmospheric concentration of the gas; this change is determined by the size of its emissions and by its atmospheric lifetime. Climate change: A nasty surprise in the greenhouse - Sep 28, 2006 Nature.com (subscription),...chemistry–transport model. The atmospheric lifetime of methane is almost a decade, so it disperses globally. Regions of strong ... |
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