Activity: CMIP5 Example Experiment 1.1 Pre-Industrial Control

Description from “Summary of Experiments for CMIP5” Document Specified non-evolving, pre-industrial conditions which may include: Prescribed atmospheric concentrations of all well-mixed gases (including CO2) some short-lived (reactive) species? Prescribed non-evolving emissions or concentrations of natural aerosols or their precursors including, possibly, an average background volcanic aerosol some short-lived species Unperturbed land use Other gasses eg ozone might be prescribed but perhaps as a function of altitude, latitude, and month of the year (eg seasonally varying) In some models reactive species might be calculated with simple chemistry models while in others they might be prescribed. The same may be true of aerosol species. Number of years = 500 (after spin-up period) length should be long enough to extend to the end of each perturbation experiment that is spawned from it. Purpose and key diagnostics: Serve as baseline for analysis of historical and future scenario runs with prescribed concentrations Estimate unforced variability of the model Diagnose drift in the unforced system Provide initial conditions for some of the other experiments

MIP: CMIP5 Project: CMIP5 Activity: Model Evaluation Experiment: Pre-Industrial control Description: Control simulation representative of conditions in the 1850s Duration: Date Range: Duration: Length:500 years Why: Serve as baseline for analysis of historical and future scenario runs with prescribed concentrations Why:Estimate unforced variability of the model Why:Diagnose drift in the unforced system Why:Provide initial conditions for some of the other experiments Numerical Experiment: 1.1 Pre-Industrial Control Calendar Type: perpetual period Calendar Type: 360 day Required Duration: closed date range: Required Duration: 500 years after spin-up period Numerical Requirement: Control: Yes Description: prescribed concentration of atmospheric trace gasses and aerosolsrepresentative of 1850s ID:abcdefgh

Boundary Condition: atmospheric concentration of well mixed gas A Boundary Condition: atmospheric concentration of well mixed gas B Boundary Condition: atmospheric concentration of short lived reactive species C Boundary Condition: atmospheric concentration of short lived reactive species D Boundary Condition: atmospheric concentration of natural aerosol precursor E Boundary Condition: atmospheric concentration of natural aerosol precursor F Boundary Condition: atmospheric concentration of average volcanic aerosol Boundary Condition: atmospheric concentration of short lived species G Boundary Condition: land use: Unperturbed Spatio-Temporal Constraint: Annual Variation Spatio-Temporal Constraint: Latitudinal Variation Spatio-Temporal Constraint: Altitude Variation Initial Condition: Input from existing pre-industrial control simulation X

Numerical Activity: Simulation: Run Name: abcde Description: Pre-Industrial Control Duration: Duration: 550 years Output: Duration: Output: Time average: Year (12 months) Output: Time average: Season (3 months) Output: Time average: Month (1 month) Platform: computing environment: HPCx Restart Dumps: 51 (every 10 years) Spin-Up length: 50 years Simulation Collection: azaaa, azbbb, azccc Simulation: Run Name: azaaa Description: Pre-Industrial Control Duration: Duration: 50 years Output: Duration: 0-50 Output: Time average: Year (12 months) Output: Time average: Season (3 months) Output: Time average: Month (1 month) Platform: computing environment: HPCx Restart Dumps: 5 (every 10 years) Spin-Up length: 50 years Simulation Collection: azaaa, azbbb, azccc

Simulation: Run Name: azbbb Description: Pre-Industrial Control Duration: Duration: 150 years Output: Duration: Output: Time average: Year (12 months) Output: Time average: Season (3 months) Output: Time average: Month (1 month) Platform: computing environment: HPCx Restart Dumps: 10 (every 10 years) Spin-Up length: 50 years Simulation Collection: azaaa, azbbb, azccc Simulation: Run Name: azccc Description: Pre-Industrial Control Duration: Duration: 200 years Output: Duration: Output: Time average: Year (12 months) Output: Time average: Season (3 months) Output: Time average: Month (1 month) Platform: computing environment: HPCx Restart Dumps: 10 (every 10 years) Spin-Up length: 50 years Simulation Collection: azaaa, azbbb, azccc

Conformance: Conformance to Boundary Condition: atmospheric concentration of well mixed gas A: data file a Conformance to Boundary Condition: atmospheric concentration of well mixed gas B: data file b Conformance to Boundary Condition: atmospheric concentration of short lived reactive species C: internal calculation Conformance to Boundary Condition: atmospheric concentration of short lived reactive species D: internal calculation Conformance to Boundary Condition: atmospheric concentration of natural aerosol precursor E: data file e Conformance to Boundary Condition: atmospheric concentration of natural aerosol precursor F: data file f Conformance to Boundary Condition: atmospheric concentration of average volcanic aerosol: data file v Conformance to Boundary Condition: atmospheric concentration of short lived species G: data file g Conformance to Boundary Condition: land use: Unperturbed: data file h Configured Model component: Atmosphere Configured Model component: Advection Configured Model component: Radiation Configured Model component: Convection Configured Model component: Gravity Waves Configured Model component: Ocean Configured Model component: Chemistry Configured Model: HadGEM1