Re: [Ag-umwelt] Methan Alarm

["Dr. Volker Jaenisch" <volker.jaenisch AT inqbus.de>]

Ahoi!

On 03/01/12 04:28, Dr. Volker Jaenisch wrote:

Aber was sagt Deutschlands größter Klimaalarmist Rahmstorf dazu?

"""
Could this be the first modest sprout of what will grow into a huge carbon feedback in the future? It is possible, but two things should be kept in mind. One is that there’s no reason to fixate on methane in particular. Methane is a transient gas in the atmosphere, while CO₂ essentially accumulates in the atmosphere / ocean carbon cycle, so in the end the climate forcing from the accumulating CO₂ that methane oxidizes into may be as important as the transient concentration of methane itself. The other thing to remember is that there’s no reason to fixate on methane hydrates in particular, as opposed to the carbon stored in peats in Arctic permafrosts for example. Peats take time to degrade but hydrate also takes time to melt, limited by heat transport. They don’t generally explode instantaneously.

For methane to be a game-changer in the future of Earth’s climate, it would have to degas to the atmosphere catastrophically, on a time scale that is faster than the decadal lifetime of methane in the air. So far no one has seen or proposed a mechanism to make that happen.

"""
http://www.realclimate.org/index.php/archives/2010/03/arctic-methane-on-the-move/

So viel zu Rahmstorf als Alarmist

Beste Grüße

Volker

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