Therefore by the same logic, B scenario temperatures should have come close to those of A from ~ 2003 onwards, and until
the next volcanic forcing.
Not exact matches
Next they attribute global mean temperature trend 1880 - 1980 to CO2,
volcanic and solar
forcing.
2) There are errors in the assumed
forcings, such as: a) AR5 let stratospheric aerosol concentration go to zero after 2000 (a sure way to prod the models into higher predictions), but it actually increased for the
next 10 years «probably due to a large number of small
volcanic eruptions».
Thus the RCP scenarios assume the long - term average
volcanic forcing in the future, and they hold it constant, which is reasonable because as you say we can't predict the
next eruption.