Hvor længe bliver co2 metan osv i atmosfæren?

The notion is pervasive in the popular and scientific literature that the lifetime of anthropogenic CO2 released to the atmosphere is some fuzzy number measured most conveniently in decades or centuries.

When you release a slug of new CO2 into the atmosphere, dissolution in the ocean gets rid of about three quarters of it, more or less...The rest has to await neutralization by reaction with CaCO3 or igneous rocks on land and in the ocean. These rock reactions also restore the pH of the ocean from the CO2 acid spike.

My model indicates that about 7% of carbon released today will still be in the atmosphere in 100,000 years. I calculate a mean lifetime, from the sum of all the processes, of about 30,000 years. That's a deceptive number, because it is so strongly influenced by the immense longevity of that long tail. If one is forced to simplify reality into a single number for popular discussion, several hundred years is a sensible number to choose, because it tells three-quarters of the story, and the part of the story which applies to our own lifetimes.

However, the long tail is a lot of baby to throw out in the name of bath-time simplicity. Major ice sheets, in particular in Greenland, ocean methane clathrate deposits, and future evolution of glacial/interglacial cycles might be affected by that long tail. A better shorthand for public discussion might be that CO2 sticks around for hundreds of years, plus 25% that sticks around forever.

miljoegrisen skrev:
Et meget simpelt spørgsmål til forum som jeg altid har undret mig over:

den Co2 vi forurener med nu; hvor lang tid vil den have påvirkning?
og hvad er forskellen mellem drivhusgasser på det punkt?

syntes ikke man høre så meget om det.

miljoegrisen skrev:
Tak rick!

det er skræmmende oplysninger, især den med de '25% that sticks around forever'

Boe Carslund-Sørensen skrev:
Drivhusgasser vælter ud af tundra!

http://www.berlingske.dk/article/20081203/danmark/712030148/

Blot til info

Har det ikke gjort det i de sidste 10.000 år?!

Men da man affyrede nogen atombomber i atmosfæren tog det 5 til 25 år inden at C14 indholdet i atmosfæren var normaliceret. 25år er noget højt sat da mange organismer er meget kort livet, og kan nå at optage og afgive C14 mange gange i den periode.

manse42 skrev:
@ kuldenvarmen


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