Identical to expt. 6.2b, but with AMIP SSTs prescribed as in expt. 3.3 (which is the control for this run).4xCO2 AMIPd35ecbca-d3a5-11df-837f-00163e9152a5--cmip5ABAMIP4XCO2Metafor CMIP5 Questionnairemetafor-qcim.1.activity.NumericalExperimentExperimentAB2Cloud response to an imposed 4xCO2 (Hansen-style diagnosis of “fast” climate system responses).Prescribed concentration of well mixed Gas: CO2 is quadruple of 3.1_pi-control CO2 concentrationbc.056cim.1.activity.BoundaryCondition6.2b.bc.4X_CO2_concboundaryConditionSea ice is the sea ice climatology from the 3.1_pi-controlbc.053cim.1.activity.BoundaryCondition6.2b.SeaIce.climboundaryConditionUnperturbed Land Use - Same as for the 3.1_pi-controlbc.010cim.1.activity.BoundaryCondition6.2b.bc.LUboundaryConditionCO2 partial pressure dissolved in ocean, climatology from the 3.1_pi-controlbc.054cim.1.activity.BoundaryCondition6.2b.bc.Ocean_CO2boundaryConditionSea surface temperature (SST) imposed from historical observationsbc.023cim.1.activity.BoundaryCondition6.5.bc.sst_obsboundaryConditionInitial conditions are from experiment 3.1_pi-controlic.002cim.1.activity.InitialCondition6.5.icinitialConditionBegin in 1850 and run for 30 yearsstc.036cim.1.activity.SpatioTemporalConstraint6.5.stc.1850_30yrspatioTemporalConstraintamip4xco2