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Understanding Atmospheric Greenhouse Gas Levels and Their Impacts on Global Warming

Explore the estimated global warming potentials relative to CO2 and the atmospheric residence time for a pulse of CO2 over the past 650,000 years. Delve into the measured increase in CO2, nitrous oxide, methane, and CFCs since 1979, as well as recent changes in methane abundance linked to industrial activities and methane capture. Gain insights into the implications of methane release from melting permafrost and the Siberian Arctic continental slope methane hydrates, possibly leading to a non-linear climate response.

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Understanding Atmospheric Greenhouse Gas Levels and Their Impacts on Global Warming

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  1. Atmospheric Greenhouse Gas Levels

  2. Estimated global warming potentials relative to CO2 (Warming effect = kilograms of CO2 per kilogram of gas) a No single lifetime can be defined for CO2 due to different rates of uptake by different removal processes. Note: The uncertainty in the global warming potentials is typically about 35%.

  3. Global CO2 Budgets (billion metric tons/year)

  4. Atmospheric Residence Time for a Pulse of CO2

  5. Greenhouse Gases for the Past 650,000 Years

  6. Measured Increase in CO2, Nitrous Oxide, Methane and CFC’s Since 1979

  7. Methane Beginning to Increase After 8 Years of Stability • From 1999 to 2006 (8 years) the methane abundance has been relatively stable due to industrial changes in Russia, changes in the methods of rice farming, and methane capture from landfill sites. • In 2007 the world methane abundance began to increase. • Based on carbon isotope analyses the methane is of biogenic origin. • The source is probably the release from melting permafrost, and the Siberian Arctic continental slope methane hydrates. • We may now be entering a non-linear climate response.

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