AMOC variability, a key factor in emission reduction scenarios
Valenti Muelas, J.M.
MetadataShow full item record
The climate system response to emission reduction shows time dependencies when evaluated in terms of global mean sur- face temperature (GMST). The Atlantic meridional overturning circulation (AMOC) variability may be forcing a non-linear behaviour on GMST response to emission reduction. In this study, emission reduction is evaluated with eight starting actions times on three equilibrium climate sensitivities (ECS), using the PLASIM-GENIE intermediate complexity Atmosphere and Ocean global climate model. Under these CO2 reducing scenarios, AMOC collapses in six out of the twenty-four simulations performed. The effect of the AMOC collapse in the emission reduction scenarios is a transient faster response (cooling) in the short term compensates with a slower response to emission reduction in the forthcoming decades. In non-collapsing scenarios, the emission reduction response might have initial conditions dependencies with the AMOC variability.