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Pre-Industrial Control Run Experimental Design

Page in progress: this is not the final version! Use the discussion panel at the end of the page 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 (see taylor_cmip5_dec31.pdf).

PI for groups only running PMIP3 experiments

Summary of PI boundary conditions

PMIP3	Alternative solution
Orbital parameters	[ ecc = 0.016724 ] - [ obl = 23.446° ] - [ peri-180° = 102.04° ]
Date of vernal equinox	March 21 at noon
Trace gases	[ CO2 = 280 ppm ] - [ CH4 = 760 ppb ] - [ N2O = 270 ppb ] - [ CFC = 0 ] - [ O3 = Modern - 10 DU ]
Aerosols	Same as PI
Solar constant	1365 W/m2	As in PI
Vegetation	Interactive	See specific note below
Ice sheets	Present day
Topography and coastline	Present day

Please use the discussion panel to comment this table!

Vegetation

Depending on the complexity of the model used the vegetation will be either:

computed by the model

prescribed to PI (some ESMs may also only compute vegetation phenology and carbon cycle).

Land use

Land use should be included in the PI vegetation map. In that case, care should be taken that the land use map used in the PI simulation is consistent with the one used for land use evolution either for the 20th century or the last Millennium.

For Earth System Models with interactive carbon cycle

The simulations are forced by the CO2 concentrations. Please use the same protocol as in CMIP5 to store the carbon fluxes and the variables needed for PCMIP (see list here External Link)

Insolation

Note that insolation should follow PMIP requirements. Please check it carefully using the following tables (PI insolation tables)

Initial conditions

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