1)Consider thesimplest linear modelof the incrementTto the Earth’s mean surface temperature arising from a forcingQand a feedback factor, :

whereC.+T =QCis the effective heat capacity of the climate system. Assume a linearly increasing radiative forcing,Q = b.t,where t isthe time in years from 1850.

a)Write-down an equation for the equilibrium temperature change that would arise from stabilising forcing at each timet.

b) AssumingT=0att=0, solve thesimplest linear modelequation to give the dynamical temperature change as a function oft, C,andb.

I can do a) and i get = b.t/

i try b) and i get =A

and =B.b.t therefore giving me CBb+ Bbt=bt

therefore = A +

and =0 and t=0

Therefore A = 0

Therefore i get =if any one could shed any light that would be useful