Based on the absorbtionspectra of H2O and CO2, doubling of the latter (280 => 560 ppm) will result in a 0,9 °C increase. The water vapour feedback included, the rise becomes only 1,3 °C. That is all.So if you overestimate a cooling factor in your calculation, your final result ends up too warm ???
The rest of the 3°C of 2xCO2 predicted by models is rather dubious : the cooling effect of aerosols is estimated (too) high, the positive temperature effect of clouds (in reality probably negative) ...
Friday, 29 May 2009
Quote of the day
On the Belgian forum politics.be, Ferdinand Engelbeen in an attempt to say science overestimates global warming, writes :