Consequently, also the PAN lifetime in atmosphere strongly depends on the ambient temperature.
And while methane is a potent greenhouse gas, its lifetime in the atmosphere is roughly a decade, so we won't be living with the consequences for nearly as long as those from CO2 emissions.
Sulfate aerosol has a fairly short lifetime in the atmosphere, so the earth system recovers in one to two years, Dr. Unger said, concluding that based on observations, the cooling effects of sulfate particulates outweigh any potential warming effects of carbon dioxide released in the explosion.
The things that will define London's Olympics as unique and make it live up to the "once in a lifetime" hype – the atmosphere throughout the city and the country, the "look and feel", the extent to which the venues come alive – are still to be defined.
Since the 2010 report, Newman says, "there's been a big effort to look at the lifetime in the atmosphere of carbon tetrachloride".
In addition, the nitrogen cycle directly impacts global climate because the greenhouse gas N2O has a relatively long lifetime in the atmosphere, more than 100 years.
This is due to carbon dioxide's very long lifetime in the atmosphere.
Isoprene is a biological substance that normally has a very short lifetime in the atmosphere, since it quickly reacts with oxygen.
But the banned chlorofluorocarbons (CFCs), once used in refrigerators and spray cans, have a long lifetime in the atmosphere and it will take several decades before their concentrations are back to pre-1980 levels, the WMO said.
These three particle modes have distinctly different chemical composition, sources, and lifetimes in the atmosphere.
