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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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FEEDBACK PARAMETERS

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


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Define Feedback parameters:

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


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FEEDBACKS AFFECTING CLIMATE SENSITIVITY

  • Stefan-Boltzmann Law (negative, λ = - 3.3 W/m2/K)

  • Water Vapor Feedback (positive, λ = 1 to 1.5 W/m2/K)

  • Ice/Snow Albedo Feedback (positive, λ = 0.1 to 0.5 W/m2/K)

  • Cloud Feedback (λ = ?)


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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


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