Historical simulation but with natural forcing only.natural-only historical simulationb7c5a10e-d3a5-11df-837f-00163e9152a5--cmip5ABHISTORICALNATMetafor CMIP5 Questionnairemetafor-qcim.1.activity.NumericalExperimentExperimentAB2Climate change detection attribution experiment.Prescribed atmospheric concentrations of pre-industrial well mixed gases: excluding CO2bc.001cim.1.activity.BoundaryCondition7.1.bc.wmg_concboundaryConditionPrescribed atmospheric concentrations of pre-industrial well mixed gas: Carbon Dioxidebc.002cim.1.activity.BoundaryCondition7.1.bc.CO2_concboundaryConditionPrescribed atmospheric concentration of pre-industrial short lived (reactive) gas speciesbc.003cim.1.activity.BoundaryCondition7.1.bc.sls_concboundaryConditionPrescribed concentrations or emissions of pre-industrial natural aerosolscim.1.activity.BoundaryCondition7.1.bc.nat_aerboundaryConditionPrescribed concentrations or emissions of pre-industrial natural aerosol precursorscim.1.activity.BoundaryCondition7.1.bc.nat_aer_precurboundaryConditionPrescribed concentrations or emissions of pre-industrial short lived (reactive) aerosol speciescim.1.activity.BoundaryCondition7.1.bc.sl_aerboundaryConditionImposed changing concentrations of historical volcanic well mixed gases, including CO2bc.012cim.1.activity.BoundaryCondition7.1.bc.volc_wmg_concboundaryConditionImposed historical changing solar forcingbc.021cim.1.activity.BoundaryCondition7.1.bc.solarboundaryConditionImposed historical changing land usebc.022cim.1.activity.BoundaryCondition7.1.bc.LUboundaryConditionInitial conditions are from experiment 3.1 piControlic.002cim.1.activity.InitialCondition7.1.icinitialConditionBegin in 1850 and run for 156 yearsstc.026cim.1.activity.SpatioTemporalConstraint7.1.stc.1850_156yrspatioTemporalConstrainthistoricalNat