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 controlDescription: Control simulation representative of conditions in the 1850sDuration: Date Range: 1850-1850Duration: Length: 500 years

Why: Serve as baseline for analysis of historical and future scenario runs with prescribed concentrations

Why: Estimate unforced variability of the modelWhy: Diagnose drift in the unforced systemWhy: Provide initial conditions for some of the other experiments

Numerical Experiment: 1.1 Pre-Industrial ControlCalendar Type: perpetual period

Calendar Type: 360 day Required Duration: closed date range: 1850-1850 Required Duration: 500 years after spin-up period

Numerical Requirement:Control: YesDescription: prescribed concentration of atmospheric trace gasses and

aerosols representative of 1850sID: abcdefgh

Boundary Condition:atmospheric concentration of well mixed gas ABoundary Condition:

atmospheric concentration of well mixed gas BBoundary Condition:atmospheric concentration of short lived reactive species CBoundary Condition:

atmospheric concentration of short lived reactive species DBoundary Condition:

atmospheric concentration of natural aerosol precursor EBoundary Condition:

atmospheric concentration of natural aerosol precursor FBoundary Condition:

atmospheric concentration of average volcanic aerosolBoundary Condition:

atmospheric concentration of short lived species GBoundary Condition:

land use: Unperturbed

Spatio-Temporal Constraint: Annual VariationSpatio-Temporal Constraint: Latitudinal Variation Spatio-Temporal Constraint: Altitude Variation

Initial Condition: Input from existing pre-industrial control simulation X

Numerical Activity:Simulation:

Run Name: abcdeDescription: Pre-Industrial ControlDuration: 1850-1850Duration: 550 yearsOutput: Duration: 0-550Output: Time average: Year (12 months)Output: Time average: Season (3 months)Output: Time average: Month (1 month)Platform: computing environment: HPCxRestart Dumps: 51 (every 10 years)Spin-Up length: 50 yearsSimulation Collection: azaaa, azbbb, azccc

Simulation:Run Name: azaaaDescription: Pre-Industrial ControlDuration: 1850-1850Duration: 50 yearsOutput: Duration: 0-50Output: Time average: Year (12 months)Output: Time average: Season (3 months)Output: Time average: Month (1 month)Platform: computing environment: HPCxRestart Dumps: 5 (every 10 years)Spin-Up length: 50 yearsSimulation Collection: azaaa, azbbb, azccc

Simulation:Run Name: azbbbDescription: Pre-Industrial ControlDuration: 1850-1850Duration: 150 yearsOutput: Duration: 50-150Output: Time average: Year (12 months)Output: Time average: Season (3 months)Output: Time average: Month (1 month)Platform: computing environment: HPCxRestart Dumps: 10 (every 10 years)Spin-Up length: 50 yearsSimulation Collection: azaaa, azbbb, azccc

Simulation:Run Name: azcccDescription: Pre-Industrial ControlDuration: 1850-1850Duration: 200 yearsOutput: Duration: 100-200Output: Time average: Year (12 months)Output: Time average: Season (3 months)Output: Time average: Month (1 month)Platform: computing environment: HPCxRestart Dumps: 10 (every 10 years)Spin-Up length: 50 yearsSimulation Collection: azaaa, azbbb, azccc

Conformance:Conformance to Boundary Condition:

atmospheric concentration of well mixed gas A: data file aConformance to Boundary Condition:

atmospheric concentration of well mixed gas B: data file bConformance to Boundary Condition:

atmospheric concentration of short lived reactive species C: internal calculationConformance to Boundary Condition:

atmospheric concentration of short lived reactive species D: internal calculationConformance to Boundary Condition:

atmospheric concentration of natural aerosol precursor E: data file eConformance to Boundary Condition:

atmospheric concentration of natural aerosol precursor F: data file fConformance to Boundary Condition:

atmospheric concentration of average volcanic aerosol: data file vConformance to Boundary Condition:

atmospheric concentration of short lived species G: data file gConformance to Boundary Condition:

land use: Unperturbed: data file hConfigured Model component: Atmosphere

Configured Model component: AdvectionConfigured Model component: RadiationConfigured Model component: ConvectionConfigured Model component: Gravity Waves

Configured Model component: OceanConfigured Model component: Chemistry Configured Model: HadGEM1