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Table of Contents
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Pre-Industrial Control Run Experimental Design
Use the discussion pannel below for comments
Boundary conditions
PI for PMIP3/CMIP5 experiments
The Preindustrial control should be the same as the one used for CMIP5 experiments. It is thus the same reference as the one for 20th century simulations and future climate projections (External Link).
PI for groups only running PMIP3 experiments
| PMIP3 | Alternative solution | |
|---|---|---|
| Orbital parameters | ecc=, obl= °, peri-180°= ° | |
| date of the Vernal equinox | March 21 at Noon | |
| Trace Gazes | CO2 = ppm, CH4 = ppb, N2O = ppb, CFC = 0, O3 = same as PI | |
| Aerosols | Same as PI | |
| Solar constant | 1365W/m2 | As in PI |
| Vegetation | Interactive | See specific note below |
| Ice sheet | Present day | |
| Topography and coastline | Present day |
Vegetation
Depending on the complexity of the model used the vegetation will be either
- computed by the model
- prescribed to PI (some ESM may only compute vegetation phenology and carbon cycle).
Land use Land use should be included in the PI vegetation map. In that case, take care that the land use map you use in the PI simulation is consistent with what is done for land use evolution either on the 20th century or the last Millenium.
For Earth System Model with interactive carbone cycle The simlations are force by the CO2 concentrations. Please use the same protocal as in CMIP5 to store the carbone fluxes and the variables needed for PCMIP (see list here External Link)
Insolation Note that insolation should follows PMIP requirements. Please check it carefuly using the following tables (External Link)
Discussion
Since PMIP won't be able to regulate the insolation that people use in the 20C3M runs and the standard controls, and some people will be varying insolation in the LM runs, more guidance is required here. Maybe, we should specify 1850AD conditions?
Hi, CMIP5 CO2 concentrations for pre-industrial are 286 ppmv for 1860 and 285 ppmv for 1850 rather than 280.