Replacement of forests with shorter vegetation together with the normally
assumed higher albedo could then cool the surface.
Not exact matches
He
assumed it was essentially a
high -
albedo desert prior to irrigation, and I don't think that's entirely accurate.
Also, if you want to compare the percent change in
albedo of 0.134 (too
high, but
assume it correct for the moment) with a 1 % reduction, the latter would be 1 % of about 100 W / m ^ 2, not 1 % of 340 W / m ^ 2, and would yield a value of about 1 W / m ^ 2.
18.4wm - 2
higher assuming the same
albedo means a radiative forcing of 3.23wm - 2, which is almost the forcing you get from doubling of CO2 or increasing solar output by 2 %.
The fact of the matter is that IPCC has relied in AR4 on models, which
assume a strongly positive net feedback from clouds, while subsequent physical observations show that the primary impact of clouds with warming is increased
albedo and
higher SW reflection resulting in an overall negative cloud feedback.