airbourne fraction
stoat | April 29, 2011Still no new science (is there any? Jules and James didn't find much to post about at EGU), but Tamino posted on AF, which prompted me to look up some of my earlier posts. Tamino shows the CO2 growth rate from 1960, and they look upwards, which was rather less obvious when I drew them from 1990 on.
If you want to think happy thoughts, you can notice that the dCO2 rates are ~a bit less than 2 ppm on average, which is to say rather closer to 0.5% than 1% (1% gets you CO2 doubling in 70 years; but even 0.5% will get us above 600 ppm by the end of this century).
Update: this is an experiment (in…
stoat | January 28, 2010This was an ask stoat question, and probably a fairly easy one, so I'll have a go.
First of all, what is it? AF (ie, Airbo(u)rne Fraction, is the proportion of human emitted CO2 that stays in the atmosphere, the rest being sunk in land or ocean. Now it is important not to confuse the "proportion that stays in the atmosphere" with "the concentration in the atmosphere" otherwise you get silly little skeptics running around thinking that "airbourne fraction is constant" means that CO2 has stopped increasing. Sigh. However, I see that last time I looked at this I was having to slap down the…