FEEDBACK PARAMETERS. Let T s = global mean surface air temperature R= net flux of heat into the climate system Δ R f = change in R due to some change in the forcing, e.g., a doubling of CO 2 Δ T s = equilibrium change in T s due to Δ R f .
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Let Ts= global mean surface air temperature
R= net flux of heat into the climate system
ΔRf = change in R due to some change in the forcing, e.g., a doubling of CO2
ΔTs = equilibrium change in Ts due toΔRf
assuming the structure of the
climate system is fixed
due to changes in the structure i = 1, 2, 3, …
If the perturbation is small then
The equilibrium global mean SAT warming for a doubling of atmospheric carbon dioxide (CO2), or ‘equilibrium climate sensitivity’, is likely to lie in the range 2°C to 4.5°C, with a most likely value of about 3°C.
IPCC 4AR Chapter 10