Heh - not seeing the complete picture

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Talk about clueless -- from Scientific American magazine:
Mysterious Stabilization of Atmospheric Methane May Buy Time in Race to Stop Global Warming
Since 1978 chemists at the University of California, Irvine, have been collecting air in 40 locations from northern Alaska to southern New Zealand. Using gas chromatography, the scientists have measured the levels of methane--CH4--in the lowest layer of our atmosphere. Although not nearly as abundant as carbon dioxide--CO2--methane remains the second most important greenhouse gas, both because each molecule of CH4 in the atmosphere traps 23 times as much heat as carbon dioxide and it helps create more ozone--yet another greenhouse gas--in the atmosphere. During the two decades of measurements, methane underwent double-digit growth as a constituent of our atmosphere, rising from 1,520 parts per billion by volume (ppbv) in 1978 to 1,767 ppbv in 1998. But the most recent measurements have revealed that methane levels are barely rising anymore--and it is unclear why.

Chemist Isobel Simpson led the research examining samples from 1998 through 2005 and found that methane levels had practically stopped rising, reaching 1,772 ppbv in 2005. During this period some years did see rises while others actually saw slight decreases, according to the paper presenting the result in the November 23 issue of Geophysical Research Letters. By also measuring levels of ethane (C2H6) and perchloroethylene, or perc, (C2Cl4) the researchers determined that these pulses in methane levels during this period could be linked to major forest fires, such as the massive burn in Indonesia from late 1997 to early 1998. "All three of these molecules are removed by the same process--reaction with hydroxyl," a radical formed from water in the atmosphere, explains Nobel Prize-winning chemist F. Sherwood Rowland, who participated in the research. "Both methane and ethane are produced in biomass burning, but perc is an industrial solvent. If biomass burning is the source, then perc [levels] should behave quite differently from the two hydrocarbons, and this is what we observed."
Which all boils down to: "we don't have a clue how the atmosphere works" The sooner the enviros wake up to that simple fact (as well as the fact that it is the sun that is the primary driver for our climate and when the sun is cooler, the earth is cooler), they can all come to our senses (or turn Malthusian again).

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This page contains a single entry by DaveH published on October 30, 2008 8:31 PM.

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